Reprogram Control Module

2025 Chevrolet Trailblazer ACTIV, FWDSECTION Reprogram Control Module

To program an existing K9 Body Control Module, perform the following procedure:

    NOTE:

    Make sure the vehicle ignition switch state is in appropriate position for the following step.

    • For Key Ignition System, begin with the ignition in the RUN position.
    • For Push Button Start System, begin with the vehicle in vehicle ON power mode.
  1. Access the Service Programming System (SPS) and follow the on-screen instructions.
  2. On the SPS Supported Controllers screen, select K9 Body Control Module - Programming and follow the on-screen instructions.
  3. NOTE:

    When performing the Tire Pressure Monitor Sensor Learn during K9 Body Control Module setup, the EL-52545  Tire Pressure Monitor Sensor and RF Diagnostic Tool must be used to activate each tire pressure sensor for vehicles with UJM.

  4. On the SPS Supported Controllers screen, select K9 Body Control Module - Setup (or K9 Body Control Module - Configuration & Setup) and follow the on-screen instructions.
  5. Check the driver information center display for additional messages regarding further calibration instructions. If there are no additional driver information center instructions present, programming is complete.
  6. Clear DTCs.
  7. If ABS, Traction Control and/or Stabilitrak indicators are ON and DTC C0161 is set in the K17 Electronic Brake Control Module after performing K9 Body Control Module programming and setup, do the following:
    1. Disconnect the scan tool from the X84 Data Link Connector.
    2. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from the vehicle. It may take up to 10 min to power down.
    3. Ignition ON/Vehicle In Service Mode, verify DTC C0161 is in history. If not, repeat the above step to make sure the vehicle is in sleep mode.
    4. Use the scan tool to clear the DTCs.
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When to See a Mechanic

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.