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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1664 (KEYLESS ENTRY SYSTEM)REPAIR INSTRUCTIONSTRANSMITTER PROGRAMMING
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Transmitter Programming

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Transmitter Programming
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: All transmitters which are to be recognized by the remote control door lock transmitter (RCDLR) must be programmed in a single programming sequence. If the system is placed in program mode it will erase all previously programmed transmitters upon the receipt of the programming signal from the first transmitter. Up to four transmitters can be programmed. Do not operate or program the transmitters in the vicinity of other vehicles that are in the keyless entry program mode. This prevents the programming of the transmitters to the incorrect vehicle.
  1. Remove the ignition key from the ignition lock cylinder.
  2. Close all of the doors.
  3. Remove the MALL PGM fuse from the fuse block.
  4. Insert the ignition key into the ignition lock cylinder.
  5. Turn the ignition to ACC.

    The body control module (BCM) will perform the following in order to identify the type of BCM installed in the vehicle:

    • Flash the seat belt indicator 1, 2, or 3 times.
    • Chime 1, 2, or 3 times.
  6. Turn the ignition to OFF, and then back to AC within 1 second.

    The BCM may begin to chime and flash diagnostic trouble codes (DTCs). If the BCM has stored any DTCs, refer to DIAGNOSTIC SYSTEM CHECK -- BODY CONTROL SYSTEM .

  7. Open and then close any vehicle door.

    The BCM will chime in order to confirm that the programming mode has been entered.

  8. Press and hold the transmitter LOCK and UNLOCK buttons simultaneously for approximately 14 seconds.
    IMPORTANT: After approximately 7 seconds the BCM will chime once to confirm that synchronization has been completed. After approximately 14 seconds the BCM will chime a second time to confirm that the programming has been completed.
  9. Repeat the previous step in order to program each additional transmitter.
  10. Remove the ignition key from the ignition lock cylinder.
  11. Install the MALL PGM fuse into the fuse block.
  12. Operate the functions of each transmitter in order to verify correct system operation.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.