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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1680 (Wiring System (OEM) Troubleshooting And Diagnosis) >> Repair Instructions >> Underhood Electrical Center or Junction Block Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. 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.
    Fig 1: Disconnecting Positive Battery Cable Stud Cover
    G01586858Courtesy of GENERAL MOTORS CORP.
  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.
  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: Releasing Four Tabs Retaining Junction Block To Junction Block Retainer
    G01586859Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the instrument panel (IP) wiring harness individual connectors from the junction block.
    Fig 3: Disconnecting Instrument Panel Wiring Harness Individual Connectors
    G01586860Courtesy 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: Disconnecting Engine Wiring Harness Connector From Junction Block
    G01586861Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the IP wiring harness connector from the junction block.
    Fig 5: Disconnecting IP Wiring Harness Connector From Junction Block
    G01586862Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the forward lamp wiring harness connector from the junction block.
    Fig 6: Disconnecting Forward Lamp Wiring Harness Connector From Junction Block
    G01586863Courtesy 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: Removing Nut Retaining Junction Block Retainer To Strut Tower
      G01586864Courtesy of GENERAL MOTORS CORP.
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