Question about 1998 Pontiac Grand Am

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Changed battery,now it won't start. Tells me anti theft system needs to be reset

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Yes next time buy a adapter to plug into the cig. lighter with a 9 volt battery to keep the ecm alive and make sure the key is out of the ign. when changing the battery, now put the key in the ign, and turn the key on leave it on for 20 min. also set the parking brake before turning the key on will keep the head lights off. after 20 min. turn key off then try and start engine if this doesn't work the car will need to be towed to the dealer to reprogram the theft module. i hope this helps

Posted on Nov 16, 2009

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Turn your key to ON, Not start, just to on. The theft light should start blinking. Let it blink until it stops. Could take up to 10 minutes or so, let it go until it stops. Then it should be reset.

Posted on Nov 16, 2009

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Clicking under the hood, dashboard lights keep flashing. Wont start!


Try this. It sounds like you need to reset the ECM (engine control module) and the anti-theft system.

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Doing a full reset of the anti-theft system.

Disconnect both battery leads for at least two hours.
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Resetting a Vehicle Anti-Theft System
This is how you reset an anti theft system if you have the anti-theft light on, or your car is cranking, but you have no spark.

Doing a full reset of the anti-theft system.

Disconnect both battery leads for at least two hours.
Hold the negative and positive leads together for 5 minutes to fully discharge any power.
Put the key in the ignition, but not turned on. VERY IMPORTANT!
Connect the positive lead.
Connect the negative lead in one swift movement.
Wait 15 minutes for the system to fully reset.
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