GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2007 🢒 H3 🢒 Body Systems 🢒 Wipers and Washers 🢒 Underhood Electrical Center or Junction Block Replacement

Removal Procedure
  1. Open and support the hood.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .

    3. Object Number: 1579830 Size: SH
  3. Remove the cover (1) from the base (5) of the accessory wiring junction block assembly.
  4. Remove the positive battery cable nut (2) and disconnect the cable (3) from the positive terminal stud.

    5. Object Number: 1651484 Size: SH
  5. Release the 2 locking tabs from the base side as indicated by the arrows of the electrical center (1), as shown.

    6. Object Number: 1536796 Size: SH
  6. Carefully lift at each side of the underhood accessory wiring junction block assembly in order to release the underhood accessory wiring junction block assembly from the 3 main body harness connectors (1) and exposing the lower connectors.
  7. Remove the underhood accessory wiring junction block assembly from the vehicle.

    8. Object Number: 1536798 Size: SH

    Important: Using a hook-type tool, as shown, re-stage all 3 lower harness connectors into the lower base prior to installing the new underhood accessory wiring junction block assembly.

  8. Use the hook tool to pull the connector (1) upward in order to secure the connectors into the base.

Installation Procedure

    Object Number: 1536796 Size: SH
  1. Verify that all 3 connectors (1) are secured to the base by applying light downward pressure to each connector and verifying the tabs are locked (2) on each side of the connector.
  2. Position the new underhood accessory wiring junction block assembly over the top of the base and align the locator pins to the underhood accessory wiring junction block assembly base.
  3. Once aligned, apply downward pressure to the new underhood accessory wiring junction block assembly in order to secure the top half to the base.

    4. Object Number: 1651484 Size: SH
  4. Inspect the 2 outer locking tabs (1) to ensure the new underhood accessory wiring junction block assembly is locked into the lower base.

    5. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1579830 Size: SH
  5. Install the positive battery cable (3) over the stud and install the retaining nut (2).

    6. Tighten
    Tighten the nut to 10 N·m (89 lb in).

  6. Install the underhood electrical center cover (1) to the electrical center base (5).
  7. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  8. Close the hood.