GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Express 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Body Wiring Harness Junction Block Replacement

Removal Procedure

    Warning: Refer to SIR Warning in the Preface section.


    Object Number: 871238 Size: SH
  1. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection.
  2. Remove the drivers seat. Refer to Driver or Passenger Seat Replacement.
  3. Remove the junction block cover (1).

    4. Object Number: 871239 Size: SH
  4. Remove the positive battery cable nut (2) from the junction block.
  5. Remove the positive battery cable (3) from the junction block.
  6. Disconnect the electrical connectors (1) from the junction block, if equipped with YF7.

    7. Object Number: 871233 Size: SH
  7. Completely loosen the junction block caged bolts (2).
  8. Release the tabs that retain the junction block (1) to the junction block base.
  9. Remove the junction block (1) from the block base.

    10. Object Number: 871235 Size: SH
  10. Remove the junction block base nuts (1, 3).
  11. Remove the wiring harness (4) from the junction block base (2).
  12. Remove the junction block base (4) from the floor.

Installation Procedure

    Object Number: 871240 Size: SH
  1. Install the wiring harness (2) to the junction block base (3).
  2. Install the junction block base (3) to the floor studs.

    3. Ensure the remaining electrical connections (4, 5) are not captured under the junction block base after installations the floor studs.

    Caution: Refer to Fastener Caution in the Preface section.

  3. Install the junction block base nuts (1) to the floor studs and tighten to 5 N·m (44 lb in).

    4. Object Number: 871233 Size: SH
  4. Install the junction block (1) to the junction block base.

    5. Ensure the retaining tabs are fully seated. Tighten the bolts (2) to 5 N·m (44 lb in).


    Object Number: 871242 Size: SH
  5. Connect the electrical connectors (1), if equipped with YF7.

    6. Object Number: 871239 Size: SH
  6. Connect the positive battery cable (3) to the junction block.
  7. Install the positive battery cable nut (2) and tighten to 10  N·m (88 lb in).

    8. Object Number: 871238 Size: SH
  8. Install the junction block cover (1).
  9. Install the drivers seat. Refer to Driver or Passenger Seat Replacement.
  10. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection.