Question about 2002 Buick LeSabre

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Check engine light is on and nothing is wrong

How do I disconnect the battery cable to reset the computer?

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Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with one of the components or sensors it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you need to diagnosed and repaired it. The list of possible codes number in the hundreds. The code itself doesn't tell exactly what component is defective - it only indicates where to look, or what engine parameter is out of normal range. Even if you reset the light, if the underlying problem is not addressed it will come back on. If you want to reset the light don't disconnect the battery cable, find a buddy with a code reader.

Posted on Mar 10, 2009

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When you clean battery cable and the fail safe turns on how do yoy reset


Battery Disconnect Problems - Auto Diagnosis Repair Help

www.aa1car.com/library/battery_disconnect_problems.htm
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Yes it may help, also disconnect the battery from the cables,
take the disconnected cables Pos. and Neg. and touch them together, this sometimes resets the computer, Good luck.
PS be very careful when disconnecting the battery, if you don't
feel comfortable don't do it.

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What computer are you talking about , engine computer. It doesn't matter because there is no reset button. You need a scan tool or disconnect the negative battery cable for 5 or 10 min. Is the vehicle check engine light on , is that what's going on here ? You can try an reset the computer, but if the computer system has a problem it will come back on. An if the light is on you need to have it scanned for codes.

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Disconnect the negative cable from the battery, then go inside your car and press the break pedal for 30 seconds. That should drain the extra power and reset your computer.

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Disconnect the battery cable (either post) and leave disconnected for five minutes. Reconnect the cable. See if that makes a difference. By disconnecting the battery, the computer will reset.

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Disconnect your battery. Touch the two battery cables together. (make sure they are not in contact while hooked to the battery). Then leave the battery disconnected for 10mins. Connect battery again. This should reset the computer. Sometimes lights my be on until you drive the vehicle a short distance, then it resets.

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1 Answer

I tried to reset the engine light by disconnecting the battery cable. When I put it back on the car wont start and gage needles are jumping


As I know disconnecting battery cable cannot reset engine light.
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But before that, I suppose to have your car checked first to make sure there's nothing wrong.

Good luck.

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I am replacing my car computer I like to know how to reset the new computer


Before you start, make sure your negative battery cable is disconnected. Once the new computer is installed, reconnect the battery cable. Since the "new" computer isn't connected to a power source, everything in its memory should already be reset, and it will be ready to go.

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1 Answer

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When you remove the injectors necessarily you have to disconnect the battery negative cable for security reasons.This automatically reset your computer. If for some reason you did not disconnected just do it for more than 30 seconds to reset your computer

regards

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