GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2008 🢒 Lucerne 🢒 Engine 🢒 Engine Controls and Fuel - 3.8L 🢒 Ignition Control Module Replacement

Removal Procedure

    Object Number: 1686624 Size: SH
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  3. Loosen the bolt securing the ignition control module (ICM) wiring harness electrical connector.
  4. Disconnect the ICM wiring harness electrical connector (2) from the ICM.

    5. Object Number: 1693864 Size: SH
  5. Disconnect the rear spark plug wires (1) from the ignition coils.
  6. Disconnect the front spark plug wires (2) from the ignition coils.

    7. Object Number: 1693822 Size: SH
  7. Remove the ignition coil bolts.
  8. Remove the ignition coils from the ICM.

    9. Object Number: 1693880 Size: SH
  9. Remove the ICM from the bracket.

Installation Procedure

    Object Number: 1693880 Size: SH
  1. Place the ICM onto the bracket.

    2. Object Number: 1693822 Size: SH
  2. Install the ignition coils to the ICM.

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

  3. Install the ignition coil bolts.

    4. Tighten
    Tighten the bolts to 4.5 N·m (40 lb in).


    Object Number: 1693864 Size: SH
  4. Connect the rear spark plug wires (1) to the ignition coils.
  5. Connect the front spark plug wires (2) to the ignition coils.

    6. Object Number: 1686624 Size: SH
  6. Install the ICM wiring harness electrical connector.
  7. Tighten the bolt (2) securing the ICM wiring harness electrical connector.
  8. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  9. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  10. Refer to Control Module References for programming and setup information.