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Home >> GMC >> 2009 >> Envoy 4.2 S, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Repair Instructions >> Body Control Module Replacement >> Removal Procedure

Removal Procedure

NOTE:
  • The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM).
  • Always disconnect the 40-way body wiring extension FIRST, the 32-way tan connector SECOND and the 24-way gray electrical connector LAST.
  • Always connect the 24-way gray electrical connector FIRST, the 32-way tan connector SECOND and the 40-way body wiring extension LAST.
  • The BCM can set DTCs with the ignition switch in the OFF position. The BCM has battery run down protection for the courtesy lamp circuit. The BCM battery run down protection cannot detect shorts on inputs or other circuits which the BCM does not control. Use the scan tool in order to activate the POWER DOWN NOW mode. Use the POWER DOWN NOW mode in order to check for current draws on circuits that are not controlled by the BCM, or controlled by the battery run down protection system.
  • Do not touch the exposed electrical contacts of the body wiring extension. Do not open the BCM housing. The module does not have any serviceable components. The module may be replaced only as an assembly.
    WARNING: Refer to Battery Disconnect Warning .
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. If replacing the BCM on a GMC Envoy XL, remove the left second row seat. Refer to Rear Seat Replacement .
  3. If replacing the BCM on a Chevrolet TrailBlazer or GMC Envoy, position the left hand second seat to a cargo position.
    4. Fig 1: View Of Rear Electrical Center Cover
    GM683548Courtesy of GENERAL MOTORS CORP.
  4. Remove the rear electrical center cover.
    5. Fig 2: Identifying Rear Electrical Center Locking Tab
    GM728745Courtesy of GENERAL MOTORS CORP.
  5. Press down and hold the locking tab (1).
  6. Disengage the sliding latch retaining the BCM to the rear electrical center.

    Slide the latch inboard until fully extended, approximately 40 mm (1.6 in).

    7. Fig 3: View Of Body Wiring Extension From BCM
    GM684396Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the 40-way body wiring extension (1) from the BCM.
    8. Fig 4: Connecting BCM Connectors
    GM709161Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the 32-way tan electrical connector (2) from the BCM.
  9. Disconnect the 24-way gray electrical connector (1) from the BCM.
    10. Fig 5: View Of BCM & Rear Electrical Center
    GM684391Courtesy of GENERAL MOTORS CORP.
  10. With an upward motion, remove the BCM (1) from the rear electrical center.
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