GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 256329  Size: SH
  1. Disconnect the electrical connector from the ignition control module (ICM).

  2. Object Number: 698624  Size: SH
  3. Remove the cover (4) from the ignition coils (3).
  4. Remove the screws (1) retaining the ICM .
  5. Remove the ignition control module (2).

Installation Procedure

Important: When servicing the ignition system components, use the following recommended procedures:

   • DO NOT re-install any component that has visible signs of damage.
   • Clean all the mounting surfaces before re-installing any components.


    Object Number: 698624  Size: SH
  1. Install the ignition control module (2) on the ignition coils.
  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 ICM retaining screws (1).
  4. Tighten
    Tighten the screws to 1.1 N·m (10 lb in).

  5. Install the cover (4) on the ignition coils (3).

  6. Object Number: 256329  Size: SH
  7. Connect the electrical connector to the ignition control module.