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Wrenchtech, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1403
Experience:  40 years experience with ASE certification as Master Technician with L1--Repair Shop Owner
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2005 chevy impala: the security light..manual states..passlock

Customer Question

I have a 2005 chevy impala and the security light is coming on and the car won''t turn over. The owner''s manual states it could be the fuse but I can''t determine from the manual which fuse is associated with the passlock? Can you provide some guidance?
Submitted: 9 years ago.
Category: Chevy
Expert:  GM Master Tech 01 replied 9 years ago.
The pass lock system is internal to the body control module on this car except for the sensor at the ignition switch. The BCM fuse is in the Driver side fuse block it is a 10 amp fuse
Expert:  Wrenchtech replied 9 years ago.
This is a different expert.

I'm giving you the factory relearn procedure to reset the security system. It may or may not work. If it does not work, it means that there is a hard failure in the system and it require the use of a Tech 2 scan tool to diagnose it properly.

If it fixes it but the problem occurs again later, then you may have a problem with the sensor in the ignition switch which is very common and thje ignition lock will have to be replaced and the system relearned again.


IMPORTANT: Due to component variability, the vehicle theft deterrent (VTD) system must have the learn procedure performed regardless, if the vehicle starts on the first ignition cycle after a VTD repair.

You must perform a theft relearn procedure if any of the following components have been replaced:

  • Passlock Sensor
  • Instrument Panel Cluster (IPC)
  • Powertrain control module (PCM) The above modules, with the exception for the Passlock Sensor must also be programmed with each module's own vehicle configuration.

Time required, approximately 10 minutes:

  1. Insure that the battery is fully charged.
  2. Use the scan tool in order to clear the DTCs.
  3. Turn the ignition switch from the OFF position to the CRANK position attempting to start the vehicle. The vehicle will start and then stall.
  4. Leave the ignition switch in the ON position while observing the security indicator.
  5. When the security indicator turns off, which can take up to 10 minutes, turn the ignition switch off. Wait 10 seconds.
  6. The BCM and the PCM will learn the new code on the next start attempt.