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You need a scan tool, or you can disconnect your battery, but disconnecting your battery can lock your stereo if it is the factory stereo. If you don't have the code to your stereo, a $50.00 scan tool at AutoZone is cheaper than paying the dealer to unlock your stereo.
If vehicle has been submerged, PCM is likely dead. If vehicle has been struck by lightning, PCM could be locked up or dead. Assuming none of these has happened:
Check power to PCM, not just fuses. You can check through the backside of the connectors ON the PCM.
Check connectors on PCM.
Check ground to PCM.
Make sure you've had no rodent activity on vehicle wiring.
Reset PCM by disconnecting battery (+) lead, waiting 15 seconds, then grounding battery (+) to battery (-) lead. Reconnect battery (+) lead to battery. All user memory sets such as radio and seat settings will be lost.
With no output from PCM, after resetting, the highest probability is dead PCM. It's rare, but it happens.
YOU SUPPOSE TURN OFF RADIO FIRST BEFORE REMOVING BATTERY CABLE BECAUSE YOU WILL LOCK IT OUT.TAKE TO DEALERSHIP.THEY HAVE TO FIND AND REPROGRAM RADIO PLAY CODE.
The stereo will have to be removed from the dash and taken to the Chevy dealer with the vin of the truck to even begin to get that code.I have been trough that process before.
If the PassLock number has not been provided, you can call your local GMC dealer, give them your vehicle's V.I.N. (located near the driver's side lower windshield, near the cowl), and they will be able to give you the proper code to unlock the radio, as well as be able to explain the procedure for doing so.
Have you tried to turn the stearing wheel side to side while turning the key? Sometimes the wheel gets bumped and it locks with the key in the ignition and the added tension won't alow you to turn key unless you turn the wheel from one side to the other.
Go over your steps when you installed your new receiver.This car (2000 Camry) is not programed to give anyone a problem when battery is disconnected.
You may have discon the module for the door locks and remote.
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