GM Service Manual Online
For 1990-2009 cars only

Glow Plug Relay Replacement California

Removal Procedure


    Object Number: 813243  Size: SH

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cables.
  2. Loosen the outlet duct clamp at the upper intake manifold cover.
  3. Remove he upper intake manifold cover from the outlet duct.
  4. Remove the upper intake manifold cover.

  5. Object Number: 741153  Size: SH
  6. Remove the battery supply wiring harness nut (1) and harness connector from the glow plug controller battery voltage supply post.
  7. Remove the glow plug wiring harness connectors (2) from the glow plug controller (3).
  8. Remove the glow plug controller mounting bolt (6) from the mounting bracket (4).
  9. Remove the glow plug controller (3) from the mounting bracket (4).

Installation Procedure


    Object Number: 741153  Size: SH
  1. Install the glow plug controller (3) on the mounting bracket (4).
  2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the glow plug controller mounting bolt (6).
  4. Tighten
    Tighten the bolt to 20 N·m (15 lb ft).


    Object Number: 741153  Size: SH
  5. Install the wiring harness connectors (2) to the controller (3).
  6. Install the battery supply wiring harness connector and nut (1) on the glow plug controller .
  7. Tighten
    Tighten the nut to 5 N·m (44 lb in).


    Object Number: 813243  Size: SH
  8. Install the upper intake manifold cover.
  9. Install the upper intake manifold cover to the outlet duct.
  10. Tighten the outlet duct clamp at the upper intake manifold cover.
  11. Tighten
    Tighten the clamp to 6 N·m (53 lb in).

  12. Connect the negative battery cable(s).

Glow Plug Relay Replacement Federal

Removal Procedure


    Object Number: 813243  Size: SH
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Loosen the outlet duct clamp at the upper intake manifold cover.
  3. Remove he upper intake manifold cover from the outlet duct.
  4. Remove the upper intake manifold cover.

  5. Object Number: 1177261  Size: SH
  6. Using a flat bladed screwdriver, disengage the glow plug controller cover clips.

  7. Object Number: 1177263  Size: SH
  8. Remove the glow plug controller cover.

  9. Object Number: 1177268  Size: SH
  10. Remove the glow plug relay terminal nuts and wires.

  11. Object Number: 1177264  Size: SH
  12. Remove the glow plug controller nuts.

  13. Object Number: 1177266  Size: SH
  14. Lift the glow plug controller off the studs.

  15. Object Number: 1177269  Size: SH
  16. Separate the glow plug relay from the glow plug controller housing by inserting a small screwdriver between them while prying the relay assembly outward.

  17. Object Number: 1177270  Size: SH
  18. Slide the glow plug relay outward to disengage it from the glow plug controller housing.

  19. Object Number: 1177271  Size: SH
  20. Using a flat bladed screwdriver, disengage the glow plug relay clip.

  21. Object Number: 1177272  Size: SH
  22. Remove the glow plug relay.

Installation Procedure


    Object Number: 1177272  Size: SH
  1. Install the glow plug relay.

  2. Object Number: 1177270  Size: SH
  3. Slide the glow plug relay inward to engage it to the glow plug controller housing.

  4. Object Number: 1177266  Size: SH
  5. Set the glow plug controller onto the studs.

  6. Object Number: 1177264  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  7. Install the glow plug controller nuts.
  8. Tighten
    Tighten the nuts to 42 N·m (31 lb ft).


    Object Number: 1177268  Size: SH
  9. Install the glow plug relay terminal wires and nuts.
  10. Tighten
    Tighten the nuts to 5 N·m (44 lb in).


    Object Number: 1177263  Size: SH
  11. Install the glow plug controller cover.

  12. Object Number: 813243  Size: SH
  13. Install the upper intake manifold cover.
  14. Install the upper intake manifold cover to the outlet duct.
  15. Tighten the outlet duct clamp at the upper intake manifold cover.
  16. Tighten
    Tighten the clamp to 6 N·m (53 lb in).

  17. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.