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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1572 (Wiring Systems (General Information)) >> Repair Instructions >> Rear Electrical Center or Junction Block Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
  1. Disconnect the battery negative cable.
  2. If replacing the rear electrical center on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. Refer to SEAT SYSTEM  in Seats.
  3. If replacing the rear electrical center on a Chevrolet TrailBlazer, GMC Envoy or Oldsmobile Bravada, position the left second row seat to a cargo position.
  4. Remove the rear electrical center cover.
    Fig 1: Removing Rear Electrical Center Cover
    G01640234Courtesy of GENERAL MOTORS CORP.
  5. Remove the battery feed terminal nut (2) from the junction block.
  6. Remove the body control module (BCM) from the rear electrical center. Refer to BODY CONTROL MODULE REPLACEMENT  in Body Control System.
  7. Fully loosen the 3 bolts (1) that retain the junction block to the electrical connectors.
    Fig 2: Removing Battery Feed Terminal Nut From Junction Block
    G01640235Courtesy of GENERAL MOTORS CORP.
  8. Release the tabs that retain the junction block to the block base.
  9. Remove the junction block from the block base.
    Fig 3: Removing Junction Block From Block Base
    G01640236Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the instrument panel harness connector (1) from the junction block.
    Fig 4: Disconnecting Instrument Panel Harness Connector From Junction Block
    G01640237Courtesy of GENERAL MOTORS CORP.
  11. Disconnect the mobile telephone harness connector (1) from the junction block.
    Fig 5: Disconnecting Mobile Telephone Harness Connector From Junction Block
    G01640238Courtesy of GENERAL MOTORS CORP.
  12. Disconnect the body wiring harness connector (1) from the junction block.
  13. Disconnect the headliner harness connector (2) from the junction block.
  14. Disconnect the console harness connector from the junction block.
  15. Remove the block base retaining nuts from the floor studs.
  16. Remove the block base from the floor panel.
    Fig 6: Disconnecting Body Wiring Harness Connector And Headliner Harness Connector From Junction Block
    G01640239Courtesy of GENERAL MOTORS CORP.
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