Body Control Module: Service and Repair

2005 Chevrolet Blazer 4WD V6-4.3L VIN XSECTION Service and Repair


BODY CONTROL MODULE REPLACEMENT

REMOVAL PROCEDURE




1. Remove the left instrument panel (I/P) sound insulator from the vehicle.

IMPORTANT: The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM). Always disconnect the Brown BCM connector FIRST and connect the Brown BCM connector LAST. The BCM can set DTCs with the ignition switch in the OFF position.

2. Remove the lower I/P sound insulator from the vehicle.
3. Disconnect the electrical connectors from the BCM.
4. Bend the 2 snap retainers back slightly and pull the BCM from the bracket at an angle.

INSTALLATION PROCEDURE




1. Install the BCM to the bracket at an angle under the wide hook retainer, with the label facing away from the bracket.
2. Apply pressure on the left side of the BCM in order to move the module toward the mounting bracket base. Snap the module into place.
3. Ensure that the module is fully seated. Ensure that both snap retainers are holding the module.
4. Connect the electrical connectors to the BCM. Connect the brown connector LAST.
5. Install the lower I/P sound insulator to the vehicle.
6. Install the left I/P sound insulator to the vehicle.
7. Use the following components in order to program the BCM with the proper calibrations:
- The Techline Terminal
- The scan tool
8. Perform the BCM programming. Refer to Body Control Module (BCM) Programming/RPO Configuration. Programming and Relearning
9. Clear the DTCs.
RENDER: 1.0x

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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.