GM Service Manual Online
For 1990-2009 cars

Turn Signal Multifunction Switch Replacement On Vehicle

Removal Procedure

  1. Remove the upper column components. Refer to Turn Signal Cancel Cam and Steering Shaft Upper Bearing Spring Replacement .

  2. Object Number: 378807  Size: SH
  3. Remove the round washer head screw (2).
  4. Remove the switch actuator arm assembly (3).
  5. Remove the pan head 6-lobed socket screws (1).

  6. Object Number: 378802  Size: SH
  7. Remove the wire protector.

  8. Object Number: 378820  Size: SH
  9. Pull the turn signal switch assembly connector through the column and remove the turn signal switch assembly.

Installation Procedure


    Object Number: 378820  Size: SH
  1. Pull the turn signal switch assembly connector through column and onto the race and upper shaft assembly.

  2. Object Number: 378815  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.

  3. Install the pan head 6-lobed socket screws (1).
  4. Tighten
    Tighten the screws to 3.5 N·m (31 lb in).

  5. Lubricate and install the switch actuator arm assembly (3).
  6. Install the round washer head screw (2).
  7. Tighten
    Tighten the screw to 2.3 N·m (20 lb in).


    Object Number: 378802  Size: SH
  8. Install the wire protector.
  9. Install the upper column components. Refer to Turn Signal Cancel Cam and Steering Shaft Upper Bearing Spring Replacement .

Turn Signal Multifunction Switch Replacement Off Vehicle

Removal Procedure


    Object Number: 354112  Size: SH
  1. Remove the tilt lever. Refer to Tilt Lever Replacement .
  2. Remove the multifunction lever. Refer to Multifunction Turn Signal Lever Replacement .
  3. Remove the hazard knob.
  4. Remove the turn signal cancel cam assembly. Refer to Turn Signal Cancel Cam and Upper Bearing Inner Race Replacement .
  5. Remove the round washer head screw (2) from the signal switch arm actuator (3).
  6. Pry out the signal switch arm actuator (3) from the steering column housing assembly
  7. Remove the 3 binding head cross recess screws (1) from the turn signal switch assembly.

  8. Object Number: 354116  Size: SH
  9. In order to remove the turn signal switch assembly, use the following steps.
  10. Remove the steering column wire harness strap.
  11. Remove the wiring protector.

  12. Object Number: 343824  Size: SH
  13. Disconnect the terminal connector from the turn signal switch assembly connector.
  14. Remove the terminal connector from the dimmer switch assembly.
  15. Pull the turn signal switch assembly connector through the steering column, if needed.

Installation Procedure


    Object Number: 343961  Size: SH
  1. Thread the turn signal switch assembly connector through the steering column housing assembly, if the connector is hanging.

  2. Object Number: 354114  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.

  3. Install the turn signal switch assembly and secure using 3 binding head cross recess screws (1).
  4. Tighten
    Tighten the 3 binding head cross recess screws to 3.5 N·m (31 lb in).

  5. Lubricate the signal switch arm actuator (3) with lithium grease.
  6. Install the signal switch arm actuator (3) onto the turn signal switch assembly.
  7. Secure the signal switch arm actuator (3) using the round washer head screw (2).
  8. Tighten
    Tighten the round washer head screw (2) to 2.5 N·m (22 lb in).


    Object Number: 343824  Size: SH
  9. Install the terminal connector to the turn signal switch assembly connector.
  10. Install the terminal connector to the dimmer switch assembly.

  11. Object Number: 354116  Size: SH

    Notice: Improper routing of the wire harness assembly may damage the inflatable restraint steering wheel module coil. This may result in malfunction of the inflatable restraint steering wheel module coil.

  12. Pull the turn signal switch assembly connector towards the base of the column.
  13. Insert the wire protector into the steering column bracket.
  14. Insert the steering column wire harness into the steering column wire harness strap.
  15. Install the turn signal cancel cam components. Refer to Turn Signal Cancel Cam and Upper Bearing Inner Race Replacement .
  16. Install the hazard knob.
  17. Install the multifunction lever. Refer to Multifunction Turn Signal Lever Replacement .
  18. Install the tilt lever. Refer to Tilt Lever Replacement .