GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Disconnect the Ignition Control Module electrical connector.

  2. Object Number: 256329  Size: SH
  3. Remove the beauty cover (1). Lift at the end opposite the module to release the clip retainer from the ball pin on the cassette. Then slide the cover out of the slide latch in the module.
  4. Remove the 4 Ignition Control module to coil cassette mounting screws.
  5. Lift the module straight up off of the cassette.
  6. Check that the mating connector and seal came off with the module. If not, remove the mating connector and seal from the cassette. (with the mating connector removed, the cassette will have a female connector cavity with male pins).

Installation Procedure

Important: When replacing the Ignition Control module, use the following recommended procedures:

   • Ensure that the mating connector and seal are removed from the coil cassette.
   • When installing a new module, insert the mating connector into the module, install the seal and apply dielectric grease to the terminals on the mating connector prior to installing in the cassette.
   • Check all connectors for damaged terminals.
   • Clean all mounting surfaces before re-installing components.

  1. Install the Ignition Control module onto the coil cassette.
  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 4 Ignition Control module to coil cassette mounting screws.
  4. Tighten
    Tighten the mounting screws to 0.8N·m (7.1 Lb. in.)

  5. Install the beauty cover. Slide the latch tongue into the module while holding the opposite end slightly away from the coil cassette surface in order to clear and align the ball pin on the cassette with the clip retainer on the beauty cover. Press the clip retainer down onto the ball pin.
  6. Connect the Ignition Control Module electrical connector.