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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1223 (Wiring Systems (General Information)) >> Repair Instructions >> Underhood Electrical Center or Junction Block Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE .
  2. Release and reposition the remote positive battery cable stud cover
  3. Remove the nut retaining the positive battery cable lead to the underhood accessory wiring junction block, then reposition the cable lead away from the junction block
    Fig 1: Remote Positive Battery Cable Stud Cover
    G01615919Courtesy of GENERAL MOTORS CORP.
  4. Release the coolant recovery tank hose retainer from the junction block
  5. Release the four tabs retaining the junction block to the junction block retainer and reposition the junction block
    Fig 2: Junction Block
    G01615920Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the instrument panel (IP) wiring harness individual connectors from the junction block
    Fig 3: I/P Wiring Harness Individual Connectors
    G01615921Courtesy of GENERAL MOTORS CORP.
  7. Loosen the bolts retaining the engine, IP and forward lamp wiring harness connectors to the junction block
  8. Disconnect the engine wiring harness connector from the junction block
    Fig 4: Engine Wiring Harness Connector
    G01615922Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the IP wiring harness connector from the junction block
    Fig 5: I/P Wiring Harness Connector
    G01615923Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the forward lamp wiring harness connector from the junction block
    Fig 6: Forward Lamp Wiring Harness Connector
    G01615924Courtesy of GENERAL MOTORS CORP.
  11. If accessory wiring junction block retainer removal is necessary, perform the following:
    1. 11.1. Release the positive battery cable lead retainers from the junction block retainer, then reposition the cable lead away from the retainer
    2. 11.2. Remove the nut retaining the junction block retainer to the strut tower
    3. 11.3. Lift the junction block retainer to release the lower tab and remove the retainer from the vehicle
    Fig 7: Accessory Wiring Junction Block Retainer
    G01615925Courtesy of GENERAL MOTORS CORP.
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