GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Blazer - 4WD - RHD 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Body Control Module Replacement

Removal Procedure

Important: The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the BCM. Always disconnect the Brown BCM connector FIRST and connect the Brown BCM connector LAST. The BCM can set DTC(s) with the ignition switch in the OFF position.


    Object Number: 239852 Size: SH
  1. Remove the left instrument panel sound insulator from the vehicle. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gages and Console.
  2. Remove the lower instrument panel sound insulator from the vehicle. Refer to Instrument Panel Insulator Panel Replacement in Instrument Panel, Gages and Console.
  3. Disconnect the electrical connectors from the body control module.
  4. Bend the 2 snap retainers back slightly and pull the left side of the body control module forward.
  5. Remove the body control module from the bracket at an angle.

Installation Procedure

    Object Number: 239852 Size: SH
  1. Install the body control module to the bracket at an angle under the wide hook retainer, with the label facing away from the bracket.
  2. Install the module connector end. Position the module above and between the 2 snap retainers.
  3. Slide the body control module under the wide hook retainer.
  4. Apply pressure on the left side of the body control module in order to move the module toward the mounting bracket base. Snap the module into place.
  5. Ensure that the module is fully seated. Ensure that both snap retainers are holding the module.
  6. Connect the electrical connectors to the body control module. Be sure to connect the brown connector last.
  7. Install the lower instrument panel sound insulator to the vehicle. Refer to Instrument Panel Insulator Panel Replacement in Instrument Panel, Gages and Console.
  8. Install the left instrument panel sound insulator to the vehicle. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gages and Console.
  9. Use the following components in order to program the body control module with the proper calibrations:
    10. • The Techline Terminal
    • The scan tool
  10. Perform the Learn Procedure.
  11. Clear the diagnostic trouble codes (DTCs).