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Bob
Bob, Auto Tech
Category: Chevy
Satisfied Customers: 4087
Experience:  Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)
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Avalanche..together, the alarm set it off...now it wont start

Customer Question

i install a new door speakers on my avalanche and when i put it back in together, the alarm set it off...now it wont start.
Submitted: 10 years ago.
Category: Chevy
Expert:  Bob replied 10 years ago.

If the 30 minute learn procedure does not work, it will be necessary to reprogram the system with a class 2 scanner, but try it first.

 

Learn Procedures

There are 2 available methods to perform the programming procedure:

  • A 10 minute procedure which requires a Tech 2 and a techline terminal.
  • A 30 minute procedure which does not require the use of any tools.
10 Minute Learn Procedure
    Tools Required
  • Tech 2
  • Techline terminal with current Service Programming System (SPS) software
  1. Connect the Tech 2 to the vehicle.
  2. Select "Request Information" under "Service Programming".
  3. Disconnect the Tech 2 from the vehicle and connect it to a techline terminal.
  4. On the techline terminal, select "Theft Module Re-Learn" under "Service Programming".
  5. Disconnect the Tech 2 from the techline terminal and connect it to the vehicle.
  6. Turn ON the ignition, with the engine OFF.
  7. Select "Program ECU" under "Service Programming".
  8. Attempt to start the engine, then release the key to ON, vehicle will not start.
  9. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF; the vehicle is now ready to relearn the Passlock Sensor Data Code and/or password XXXXX the next ignition switch transition from OFF to CRANK.
  10. Turn OFF the ignition, and wait 5 seconds.
  11. Start the engine; the vehicle has now learned the password.
  12. With the Tech 2 scan tool, clear any DTCs.
30 Minute Learn Procedure
  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to start the engine, then release the key to ON; the vehicle will not start.
  3. Observe the SECURITY telltale; after approximately 10 minutes the telltale will turn OFF.
  4. Turn OFF the ignition, and wait 5 seconds.
  5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes; the vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.

    Important

    The vehicle learns the Passlock Sensor Data Code and/or password XXXXX the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

     

  6. Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password.
  7. With a scan tool, clear any DTCs, if needed. History DTCs will self clear after 100 ignition cycles.

Document ID# XXXXX
2002 Chevrolet Avalanche - 4WD

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