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Home >> Chevrolet >> 2001 >> Impala Base, 3.8 K >> Repair and Diagnosis >> External Pages >> Different car >> Section 444 (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 Oldsmobile Intrigue. 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 PRO in Engine Electrical.
  2. Release and reposition the remote positive battery cable stud cover.
  3. Remove the nut retaining the engine wiring harness and positive battery cable leads to the underhood accessory wiring junction block, then reposition the cable leads away from the junction block.
    Fig 1: Disconnecting Negative Battery Cable
    G01830398Courtesy of GENERAL MOTORS CORP.
  4. Release the four tabs retaining the junction block to the junction block retainer and reposition the junction block.
    Fig 2: Junction Block & Retainer
    G01830399Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the instrument panel (IP) wiring harness individual connectors from the junction block.
    Fig 3: Disconnecting IP Wiring Harness Connectors From Junction Block
    G01830400Courtesy of GENERAL MOTORS CORP.
  6. Loosen the bolts retaining the engine, IP and forward lamp wiring harness connectors to the junction block.
  7. Disconnect the engine wiring harness connector from the junction block.
    Fig 4: Disconnecting Engine Wire Harness Connector From Junction Block
    G01830401Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the IP wiring harness connector from the junction block.
    Fig 5: Disconnecting IP Wiring Harness Connector From Junction Block
    G01830402Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the forward lamp wiring harness connector from the junction block.
    Fig 6: Disconnecting Forward Lamp Wiring Harness Connector From Junction Block
    G01830403Courtesy of GENERAL MOTORS CORP.
  10. If the accessory wiring junction block retainer removal is necessary, perform the following:
    1. 10.1. Release the positive battery cable lead retainers from the junction block retainer, then reposition the cable lead away from the retainer.
    2. 10.2. Remove the nut from the junction block retainer to the strut tower.
    3. 10.3. Remove the nut from the accessory junction block retainer to the strut tower.
    4. 10.4. Lift the junction block retainer to release the lower tab and remove the retainer from the vehicle.
    5. 10.5. Remove the accessory junction block retainer from the junction block retainer and then reposition away from the junction block, if equipped.
    Fig 7: Removing Accessory Wiring Junction Block Retainer
    G01830404Courtesy of GENERAL MOTORS CORP.
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