com article we'll explain how to disconnect a car battery. Forgot to connect MAF. Step 3: Disconnect the old vehicle battery and remove it. Next, disconnect the positive battery terminal. Reset: Perform a PCM reset or disconnect the battery for a while. The computer saves your driving habits overtime. How to reset computer I am working on my 04 maxima, v6, I replaced the cam sensor on bank 1, but the car is still stuck in limp modeor so I'm told. Love the car and love the infotainment, just hope they get this working right soon. all lights come on in instrument panel on but no engine check light. When I start the car the factory alarm activates. In this case, if you don't know how to reset check engine light, here are 4 useful way for you. Familiarizing. Remove the eight Phillips screws holding the bottom enclosure in place. Although some batteries last much longer, most batteries begin breaking down chemically after four years, so you could experience dimmer headlights and other negative effects before you have a dead battery in your ES350 that you need to replace. The day before i had battery disconnected and recharged while having oil changed and serviced. i've been told to disconnect the battery to reset the computer. Disconnect. Don't sweat it. If not bolted down the airbags and seat belts may deploy; Re-connect the battery after securing the airbag module. 2) Disconnect the battery for 30 mins. I've heard that when you disconnect the battery a bunch of computer settings and such get reset. The Dangers of Removing Your Old Battery. I can not find the "reset procedure" everyone keeps telling other people to "just search for. you need to drive the car until the computer resets everything. well i think it worked. The question is how to remove car battery connections and nuts with ease, without having to deal with the risk of a short circuit or a powerful electric arc. Note: The code (i. only provide an answer if you have a knowledge of electricity. Pop the hood of your Mini and locate the battery/rain tray cover in the far-left corner, near the top edge of the fender, hood and windshield. Reconnect the battery and start the engine. On some older cars, disconnecting the battery will reset the system but in most new cars it does nothing, except potentially reset the clock. i think i stumbled across the method used to reset the computer on my 95 buick century. The first and best thing to do is disconnect the negative battery cable and leave it off for 30 seconds or so, while it is off tighten your gas cap, then reinstall the cable. Reset computer -positive cable to negative battery terminal? Post by stuartg3 » 22 Nov 2010, 23:47 Anybody ever heard of resetting the computer by disconnecting the positive battery lead and touching it off on the negative battery terminal?. To give the case and earbuds the maximum chance of survival, follow our tips for liquid damage: Open the case and remove your AirPods earbuds. However, these directions on ways to disconnect a car battery to reset the computer may help when the owner feels the need to do some basic troubleshooting that may not require a mechanic's assistance. If you have a MacBook without a removable battery, you can reset the SMC by turning on your computer while holding a specific keyboard shortcut. ***** Using this procedure, my car seemed to react a lot better than just the Fuse #11 pull. Jump TG & CG, turn car on, After reading codes, remove jumper, warning light should come on. Pull the tab to lift and remove the hard drive assembly out of the system. Car batteries store and deliver an enormous amount of energy very quickly, easily a few hundred amps, more than an arc welder. The video above shows you how to replace the battery in your 2008 Lexus ES350. The answer will first have to do with having the right knowledge of the dangers and risks of removing your old battery. Try to browse through your car manual to gather as much relevant information as you can to know why disconnecting the battery will not work. So I did and a few days later the check engine light came back on and it's still saying I need to reset the check engine light. Remove all; Disconnect; How to reset car computer with battery. Resetting Your Car’s Computer Without Tools. If you are replacing a laptop battery, you can insert the new battery after removing the old battery. 3) Release key (OFF) and reconnect the battery. ECU is right under the center consol. Newer vehicles have a feature that will simply turn the light back on after the battery is reconnected if the car is not drained of electricity properly, however. This guide was specifically done on the 2012 Toyota Camry 2. If you disconnect the battery cable in the hatch and then close the hatch, you'll have to crawl into the rear of the car, remove the folding hatch floor and locate the access point within the black plastic tray over the spare tire, and find the mechanical hatch release when you are ready to open the hatch again to reconnect the battery cable. Since the battery was unattached, you may have lost information in your car's onboard computer. A flat, unreliable battery, is always an inconvenience and at times compromises safety and can be positively dangerous. no problems since. 0 and really they all are 3. If you turn it back on, the car starts. ECU Diagnostics. There are a few things to inspect, such as: a broken terminal, bulge or bump in the case, crack or rupture of the case, excessive leaking, and discoloration. i think i stumbled across the method used to reset the computer on my 95 buick century. If so, then your battery should take a charge, Try to 'jump start' the car prior to disconnecting the battery as this will then charge the original battery using the cars' altenator. At the bottom of the battery is the battery tray that the battery sits on. Close up the box, and start your car. Mini Cooper 2014-Present: How to Replace the Battery. Removing your Battery – If you want to take a more direct approach to learning how to reset your Ford Taurus check engine light, disconnect the negative terminal to your battery. It indicates a fault within the system somewhere. FAQ: How do I reset the "Check Engine" Light? After you've properly diagnosed and fixed the problem that triggered the OBD trouble code, you can reset or clear the Check Engine / Service Engine Soon light by one of two methods. This is the only way to reset the long term trims. For 2006 and newer Club Car models the attached non-OEM charger will not be able to recognize the voltage on the battery bank and in turn will not commence charging. And it probably isn’t. 1 Use a Scan Tool 1. Porsche 997: How to Reset ECU. Isn't there a proceedure of touching the cable end together to reset the computer ??? I seem to remember that you disconnect it for 5 minutes, then touch the cable ends together, then reconnect the battery. This protects your car from corrosive battery acid. Essentially, this trick erases the stored fault codes in the PCM's keep alive memory and turns the Check Engine light off. The short answer to this question is directly related to the model number of 48 – 7YR. $250 later, the mechanic opted to reset the car's computer and everything was back to normal. How to reset the Computer code after disconnect / replace the battery 22 Answers. This will allow the car to shut off any electronic consumers that stay on for a brief period after the car is parked. that will allow the computer to relearn the airflow. drive the car approx 50 miles and if all is ok it should be reset if not u may have a pending code how long is the drive cycle to reset the computer after disconnecting battery? - 2001 Dodge Dakota Close. The first few steps will deal with how to disconnect a car battery, while the later steps will explain in detail how to replace or reconnect it. First, your battery went dead, and now your car stereo is dead, and it’s really shaping up to be just one of those days. In addition, newer Grand Vitaras may feature theft deterrent systems for both the radio and the vehicle itself. Computer reset occurs when a "good" battery is disconnected for a few minutes and then connected and the ignition is turned on (you can turn the ignition on without starting the car by not depressing the brake). HP System Recovery removes all hard drive data and reinstalls the original operating system. What are the steps to reset your computer? Disconnect your negative battery cable for 15 minutes. Here's how to perform a hard reset on Cadillacs with the CUE system. i've been told to disconnect the battery to reset the computer. when you go to replace or remove a battery you need to attach a tender to the cables to keep the voltage in the car going or else the car forgets all its settings. I was thinking of a battery disconnect reset/reboot but people here talking about issues with a loss of 12V battery power made me nervous to try it with GM telling me to. However, if the airbags did deploy, you will need to have your SRS airbag module reset. This usually requires just a 10 mm or 1/2-in socket or wrench. Method 4 - Remove Battery When Plugged In If you have a laptop with a removable battery, you can try to remove the battery during the times you have it plugged into the wall. We offers a variety of 2002 Toyota Echo Ecu to meet many budgets and needs. A maze of wires and computers is the key to your vehicle's deepest secrets. Use the fuse puller to remove the PCM IGN fuse. Step 1 How to Disconnect a Car or Truck Battery Before you begin, switch the ignition off and remove the key. Reset computer -positive cable to negative battery terminal? Post by stuartg3 » 22 Nov 2010, 23:47 Anybody ever heard of resetting the computer by disconnecting the positive battery lead and touching it off on the negative battery terminal?. Here is how to reset your car's ECU to get better fuel economy and/or for your car to lean how to use new upgrades. so, my ? is; do i disconnect or not? the only thing i pull is a 26' travel trailer. How To Disconnect A Car Battery Safely. Before repair, disconnect one of the car battery terminals for several minutes. Wait 30 minutes, then reconnect the battery. I had the seats out of the car to get them reupholstered and at one time I turned the ignition on while the side airbags were disconnected. Without a CMOS battery you would have to reset the time, date, and other system settings each time the computer starts. then shut the car off no start. Ford Mustang GT 1996-2004: How to Reset Your ECU If the engine control unit (ECU) on your Ford Mustang needs to be reset, you won't need to hire a mechanic. Also, left window now will not go back up + I cannot pop hard top. RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. I checked battery water level & it was low, so I topped it off with distilled water, got a jump, and drove home in third gear to bring the RPMs up. You may beable to reset your odometer but the computer in the car keeps track of your miles. Most of drivers feel annoying when they see the Check Engine Light still turn of even the car problem was solve. You will need a wrench to do this. Please only use the information in this video if you have lost your own car key or you are helping out a friend who has lost theirs! If you need to start a car without the key, this tutorial shows you how to find the wires in the steering column to find the eight cables underneath. Consequences of Disconnecting the Battery. These walk you through solutions for issues you may have with your device. Instead of waiting for the lights to go out, you have to disconnect the jumper between 7 and 19 while the ignition is still on. Using a wrench, loosen the negative battery cable. How to Disconnect a Battery to Reset a Transmission. Now the clamp on the battery post will probably still be tight but at this point you need to wiggle the entire hold down clamp up and off. why does the sound of the car fob comes while i am driving and turn on the security alarm of my honda accord 2001. Open the bonnet of the car and locate the battery. The answer will first have to do with having the right knowledge of the dangers and risks of removing your old battery. Replace the battery in your 2007 BMW 328i 3. Hi there: The ECU contains a small battery inside of it that acts as. Make sure the laptop is turned off and not connected to the mains. ECU is right under the center consol. Help Me Get Rid of Win10 - posted in Windows 10 Support: I have a used Asus laptop which some idiot previous owner upgraded to Win 10 from either 7 or 8 and removed any way to set it back. Thanks for helping me understand whats going on here. 5 - Put the Tow/Run to Run. How to calibrate the battery on your Android phone or tablet ok to help some of you out I have tried all other ways to reset the battery but only one has worked for me I have a Galaxy S6 im. A bridge battery allows you to remove the main battery and replace it with a good battery without having to turn off the. How to reset the Computer code after disconnect / replace the battery 22 Answers. Press and hold the Side button (aka power) until you see the Apple logo. It worked when the switch was off the odom didnt register. If you're selling or giving away your Galaxy S7, read this first. How Do You Reset a Car's Computer? | Reference. If you have already fixed the engine issue and wish to reset the warning light on your Saturn S-Series, this video will show you how quick and easy it is to do so. You may have already seen our video on how to change a car battery (a worthwhile watch before attempting to fit your battery) and noted that you need a radio code for your vehicle. This usually requires just a 10 mm or 1/2-in socket or wrench. Audi Q7 How to Replace Battery Replacing a car battery is a job that is so easy, there's no reason to pay a dealership or mechanic to do it for you. Related Discussions. CNET editors and users share the top tech 'how to' tips and tricks with advice for getting the most out of all your gadgets. I could force reset by disconnecting the battery, but it would then take another while before the system would report it was ready again. Re: System reset after battery replacement Readiness code is how the engine tells a smog checker computer that everything in the engine is working correctly with regard to smog controls. If you disconnect the battery cable in the hatch and then close the hatch, you'll have to crawl into the rear of the car, remove the folding hatch floor and locate the access point within the black plastic tray over the spare tire, and find the mechanical hatch release when you are ready to open the hatch again to reconnect the battery cable. What are the steps to reset your computer? Disconnect your negative battery cable for 15 minutes. If there is no battery compartment, use the steps in Reset a laptop with a sealed or non-removable battery. When I installed my remote starter/alarm system the battery stayed disconnected for 3-4 days and when I reconnected it the ECU memory had been completely erased. Oh boy… you're going to get all sorts of answers on this one. Wear eye protection when working with the battery to protect your eyes from sparks. Of course, it still is an option for the owner to take the car to the mechanic. The computer, clocks, etc, will continue to draw a small current, and if you leave the battery connected you may get a dead battery when you come back. 8is after I left the key on about 4-5 hrs, some interior lights were on and CD Player was on. Connect the airbag control module wiring plugs. We're sure this How to Replace a Brake Light Switch article will help you get your car back on track!. I am definately not sure on this. If a Dell laptop does not recognize its built-in battery, it will not turn on. Will disconnecting the battery reset the airbag light or do I have to use a scanner?. i heard about it working on a 95 jeep so i figured eh, wtf and tried it on my car. currently the battery has no voltage present on contacts, I have tried to jumpstart, batteryenable, but still nothing. Remove the negative battery terminal so that we can connect the multimeter in series as shown in the next step. On some older cars, disconnecting the battery will reset the system but in most new cars it does nothing, except potentially reset the clock. Without a CMOS battery you would have to reset the time, date, and other system settings each time the computer starts. Disconnect the battery. How to Disconnect a Car Battery Prior to Replacing It. Take your car to me and I can scan it for free and then let you know what needs to be replaced. The battery will not present too many challenges in most cases, especially if it’s only 3-4 years. The day before i had battery disconnected and recharged while having oil changed and serviced. Some general tips and guidelines on the do’s and don’ts of the procedure will also be discussed. ECU is now re-set. Setting the idle mixutre: This is done in one of two ways, depending upon what type of carburetor you have. Removing the battery. Though it might seem intimidating, the process is incredibly simple and can be done in less than a minute once you know. HP battery test software says that the cell voltages are like 3. Step 1 - Remove the battery tray cover. only provide an answer if you have a knowledge of electricity. Use a 10mm wrench or socket to loosen the terminal and disconnect it from the battery. This acts as a reset and may bring the changer back to working conditions. The best way to fix these glitches is to reset the computer and this can be done by disconnecting and reconnecting the battery. When I disconnect it (overnight) and reconnect it the light is not reset. Then they would work after the car turned off completely. The battery will not present too many challenges in most cases, especially if it’s only 3-4 years. Wait 30 minutes, then reconnect the battery. Also please check out the statistics and reliability analysis of Dodge Grand Caravan based on all problems reported for the Grand Caravan. Make sure the transmission is in Park (or first gear if you have a manual gearbox) and that the parking brake is engaged. the biggest mistake people do with late modal cars is think they can remove the battery with out a back flow of current to keep the computer from wiping it self. Resetting Your Car’s Computer Without Tools. 4 If the Light Comes. Step 3 – Disconnect battery. Take a test drive with a light acceleration so your truck can learn all of the shift points. A common problem for this malfunction is when the car owner recently replaced the battery, or perhaps jump-stared their vehicle, which in both cases could have caused an electrical spike that made the speedometer go berserk. How do you remove a software package that you installed in a computer running Windows 7 ? A) open Control Panel and click uninstall a program from Program section. Please only use the information in this video if you have lost your own car key or you are helping out a friend who has lost theirs! If you need to start a car without the key, this tutorial shows you how to find the wires in the steering column to find the eight cables underneath. Slot the top of the pen back into the body of the Pen. 2000 Honda Accord, I was able to reset the SRS light a few times but it kept on reappearing as soon as I buckle (drivers seatbelt) up. Every car has an onboard computer which may face a certain glitch from time to time. RE: How do you reset the PCM IP: Logged Message: 1) Disconnect NEG Battery Terminal. This disconnect between the control happened after the car battery went dead for aproximately two months that I was away. If you have troubleshot the computer and figured out it is a battery issue, you can reset it by removing the battery, and this can be completed in a few steps. just changed out my TPS (again. idle and surges do I need to disconnect the battery. Make sure the transmission is in Park (or first gear if you have a manual gearbox) and that the parking brake is engaged. Many people think that they have no control over their vehicle's ECU system, but that is not the case. The various computers lose their memory. Reseting the ECU allows you to clear all the data and start fresh. The on-board diagnostics require some power to save the memory of the fault codes it's picking up to trigger the check engine light. Our A4 car batteries are available in a variety of sizes to ensure a perfect fit, so take your pick from our extensive selection. My battery only charges to about 60% and I can't get it to charge anymore, but I can't find any information on how to change this in my control panel settings. It indicates a fault within the system somewhere. I've searched. Once you've disconnected the source of the backup power (your battery), the ECU will reset itself and in doing so will also turn off your "check engine" light. After the battery's connection has been severed from the computer a ten-minute timer will be put into force. If the engine light comes back on, take it to a mechanic in order to find out the. Afterall, our vehicle is under warranty still. The operating system provides a number of options that let you reset your Windows 10 computer to an earlier state. Press and quickly release the Volume Up button. in this case, it is a 97 Dodge Dakota w/318 CID/Automatic. Here's how to perform a hard reset on Cadillacs with the CUE system. On some older cars, disconnecting the battery will reset the system but in most new cars it does nothing, except potentially reset the clock. How in the hell do we remove the Battery? How to remove the battery on Acer Aspire E-15 laptop. To disconnect a car battery, start by turning off the engine and opening the hood so you can access the battery. If you wish to test the battery, simply unplug it and remove the battery for 30 minutes. This 45-minute procedure requires safety gloves, electrical tape, a bucket, baking soda, water, a sponge, a towel and the vehicle key. Unlike many people who think that the company is intended to make more sales, longer life batteries or protecting the car owner's wallet. i want to reset my cars on board computer, was told to disconnect BOTH battery terminals. As NICAD rechargeable batteries are used and recharged, crystals build up within the battery, blocking the ability of the battery to hold a charge. Should I remove the battery completely or just disconnect and tape up the negative Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Turn the car off, making sure that you give it enough time to really turn off by opening a door and waiting for the blue light around the USB port in the center console to turn off, then turn it back on. i've also been told it'll learn as i drive. Disconnect Possitive. But second, your charging system probably isn't designed to provide current draws that large at any time. Rashidi also notes that disconnecting the car's battery will reset all electronic systems and settings in your vehicle, so be prepared to reset the clock and any other systems. The starter motor just churns until you remove the positive cable. Seeing the method he used to reset the computer was the most disappointing experience ever. The most recently reported issues are listed below. Yep, cleaned the throttle body. How to Reset your Subaru ECU. It is never a good sign when the 'check engine' light comes up on your dashboard. Remove, or disconnect the memory saving device in strict accordance with the instructions provided, and start the car to ensure that the replacement battery is fully functional. im reading alot of people just happen to be obd ready by chance, no matter how many times. We will create improved models and use large-scale simulations to look at the combined performance and interaction of many sub-systems—such as the battery, motor, brakes (conventional and regenerative), control systems, Advanced Driver Assistance Systems—and how they operate as parts of a whole vehicle, rather than examine them in isolation. Open the hood. Disconnecting or replacing a battery on a computer-equipped vehicle may cause starting, driveability and a number of other problems, including loss of air conditioning, power accessory functions (door windows, seats, sunroof), false warning lights, even damage to certain electronic modules!. Pull the cable out of the way to eliminate any risk of the cable accidentally falling and touching the battery post. To be more precise, chemical reactions inside the battery will become inefficient for production of electricity. New battery with no reset it charged at 14. Rashidi also notes that disconnecting the car’s battery will reset all electronic systems and settings in your vehicle, so be prepared to reset the clock and any other systems. I checked battery water level & it was low, so I topped it off with distilled water, got a jump, and drove home in third gear to bring the RPMs up. 2) Turn the ignition key to the START position and hold for 15-20 seconds. This 45-minute procedure requires safety gloves, electrical tape, a bucket, baking soda, water, a sponge, a towel and the vehicle key. So we half-heartedly took the car to the mechanic. long story lol) and was wondering if there was any definitive answers on how long to leave the battery unplugged to reset the computer? ive read everything from 10-15mi. A common problem for this malfunction is when the car owner recently replaced the battery, or perhaps jump-stared their vehicle, which in both cases could have caused an electrical spike that made the speedometer go berserk. The various computers lose their memory. The operating system provides a number of options that let you reset your Windows 10 computer to an earlier state. We offers a variety of 2002 Toyota Echo Ecu to meet many budgets and needs. Remove and Re-Connect the Car Battery. We had codes cleared, check engine light is off but car still stuck in 5th gear (a/t)tried disconnecting battery for 20 min but still doesn't workonly code was camshaft sensor. computer are correct, and verifying battery state of charge is ok, the vehicle on-board computer may need to be reset. You can attempt a battery reset if your battery is behaving abnormally, or your computer will not power on or off. Codes stay in memory, so this won't clear an active code, but it will reset the computer. What are the steps to reset your computer? Disconnect your negative battery cable for 15 minutes. Looking to save on the cost of a Mercedes-Benz Battery Replacement? Burdi Motorworks put together a how-to guide just for you! Learn more about how to replace your own Mercedes car battery, or schedule an appointment online to let a professional do the work for you. 1) Turn off the lights, aircon, stereo or any system in the car that draws extra current on top of the engine. When we reset your airbag module, we erase all crash data and hard codes in compatible SRS airbag module computers (ECU, RCM, SDM, ACM). 2000 Honda Accord, I was able to reset the SRS light a few times but it kept on reappearing as soon as I buckle (drivers seatbelt) up. Why not just one? i'm an electrical engineering technologist, and know that electrons need 2 terminals for current to flow. How to clear your data off a device There are several ways to wipe personal data off gadgets before you get rid of them. The Controller Area Network, or CAN, is incredibly complex, but here's what drivers should know about how it keep your. Let it idle for 10 minutes with. car battery, car maintenance, disconnect battery, positive negative terminals When carrying out any electrical work to your car, it is usually necessary to disconnect the battery first. To reset INSPECTION, maintain the connection for approximately 12 seconds. Re: How To Reset My ECU? Red key is NOT needed when resetting ECU. Computer reset occurs when a "good" battery is disconnected for a few minutes and then connected and the ignition is turned on (you can turn the ignition on without starting the car by not depressing the brake). Heard about someone that used a switch to turn off thier instrumentation cluster (ie no gas guage, no speedo, no odo, etc. Disconnecting the battery will force your truck's computer to do a reset. If you're not driving the car for 2 months or more, then disconnect the battery. Audi Q7: How to Replace Battery. I was thinking of a battery disconnect reset/reboot but people here talking about issues with a loss of 12V battery power made me nervous to try it with GM telling me to. It's important to learn to disconnect a car battery, because if you need to work on your vehicle, you don't want to risk electrocution. Close up the box, and start your car. ECU is right under the center consol. First, though, remember to back up any files you want to keep and remove the. 0 and really they all are 3. Step 2 – Turn key to 'off' position. I've heard that when you disconnect the battery a bunch of computer settings and such get reset. 7L CC 4x4: PCM Dodge Dakota JOIN HERE 8/14/2002 12:18:41: RE: How do you reset the PCM IP: Logged Message:. If both of those are performed and you're still experiencing issues, your car may require a special computer to re-initialize the modules that lost memory. The installation of the new battery should be as quick as possible. Computer regornices the battery, but everytime I remove the battery the percent value is different. when you go to replace or remove a battery you need to attach a tender to the cables to keep the voltage in the car going or else the car forgets all its settings. Is this necesary? I thought that the computer learned as we drive. Or any warning light for service reminder which appears on the display. 1 day ago · All you have to do is find out which sensor it is and reset the car so it’ll drive with a redundant sensor. Loosen the 10mm nut, no need to remove it. You can reset it by pulling the harness out of the ECU and letting it sit for about 10 minutes, or just pull the battery conections if you don't want to take the side trim off of the center consol. When you reconnect the battery (positive first) Start the car, the computer is now reset and the light is off. hope this helps!!! Oct 05, 2010 | 1993 Subaru Loyale. The operating system provides a number of options that let you reset your Windows 10 computer to an earlier state. Will disconnecting the negative battery terminal reset the codes on the car? I know if the problem is not fixed the codes can come back , but does it actually clear the data? I heard that you need to drive your vehicle for a period of time to collect emissions data prior to an echeck. 1 Use a Scan Tool 1. Here's how to perform a hard reset on Cadillacs with the CUE system. Reset car computer. Q: A friend of mine told me that I should always disconnect the positive terminal of the battery first to keep the electricity from spilling out of the battery. In some cars, especially those made before the mid-1990s, you can reset the check engine light by disconnecting the battery. Turn the car off, making sure that you give it enough time to really turn off by opening a door and waiting for the blue light around the USB port in the center console to turn off, then turn it back on. Disconnect. In this case, if you don't know how to reset check engine light, here are 4 useful way for you. Remove the plastic caps that cover the battery posts and install the anti-corrosion washers over them. Car How To is here to help the DIY, the professional automotive technician, and the automotive repair shop consumer better understand their cars and how things work under the hood. The latest trends in software development from the Computer Weekly Application Developer Network. Driving with an unattached battery is a bad idea. Is there something I'm missing?. If you wish to test the battery, simply unplug it and remove the battery for 30 minutes. Leave the battery our of the computer for about 20 to 30 minutes and then return it to its socket. Disconnecting or resetting the computer will not let you pass the testthe computer has to be in ready test mode to pass Emissions and they know right when its plugged in. To reset the battery and ECU in sync, the fuses need to be removed in order. Remove the bottom back door. Can we disconnect the car battery to allow the boot to remain open for the day to air out? We do not know how to access the bulbs in the car panels and do not want the battery to drain. The computer will be able to hold the memory and the code for several minutes and in some cases several hours. ***** Using this procedure, my car seemed to react a lot better than just the Fuse #11 pull. Light will go back on, repeat step 3. The screws are two sizes, keep them safe and where they won’t get mixed up. comA: To reset a car's computer, disconnect the battery, clip the battery cables together, clean all of the battery terminals and connectors, reconnect the battery cables, and start the vehicle. The Dangers of Removing Your Old Battery. Remove the plastic caps that cover the battery posts and install the anti-corrosion washers over them. So disconnecting the battery is crucial. Remove and Re-Connect the Car Battery. FAQ: How do I reset the "Check Engine" Light? After you've properly diagnosed and fixed the problem that triggered the OBD trouble code, you can reset or clear the Check Engine / Service Engine Soon light by one of two methods. Ok, you need to carefully follow these directions in order for you ECU to reset properly disconnect the neg terminal, then mash the brake pedal in 5 times(no more, no less) then let the car sit for 30-40 minutes, then unplug your MAF sensor and let that sit for 10 minutes now after all that is done. Now the computer should be giving you a more accurate reading of the actual capacity of the battery. You want them close enough so that the jumper cables will reach, but not so close that they touch. Turn the key to the off position but do not remove the key, then release the gas pedal. Keep track of your battery's life and replace it before it leaves you stranded. im reading alot of people just happen to be obd ready by chance, no matter how many times. I could force reset by disconnecting the battery, but it would then take another while before the system would report it was ready again. Technically what you have to do is clear the trouble codes stored in the car's computer. I tried to disconnect the battery for a few hours but that didnt even work. The OBD 2 system requires a constant flow of energy to keep the car memory accessible. Repeat the step above of stepping back into your car and turning on your headlights. The airbag sensor will need to be reset whenever the airbag assembly has been repaired in anyway.