GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Body Systems 🢒 Horns 🢒 Steering Wheel Horn Switch Replacement

Removal Procedure

    Caution: Refer to SIR Caution in the Preface section.

  1. Disable the SIR system. Refer to SIR Disabling and Enabling.
  2. Remove the inflator module. Refer to Inflatable Restraint Steering Wheel Module Replacement.

    3. Object Number: 399638 Size: SH
  3. Remove the horn plunger from the steering column by pressing inward to the stop and rotating horn plunger 90 degrees.

    4. Object Number: 395771 Size: SH
  4. Remove the horn contact plate retaining screws from the steering wheel.
  5. Remove the horn plunger from the steering wheel.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 395771 Size: SH
  1. Install the horn plunger to the steering wheel.
  2. Install the horn contact plate retaining screws to the steering wheel.

    3. Tighten
    Tighten the horn contact plate retaining screws to 5.5 N·m (50 lb in).


    Object Number: 399638 Size: SH
  3. Install the horn plunger to the steering column.
  4. Install the inflator module. Refer to Inflatable Restraint Steering Wheel Module Replacement.
  5. Enable the SIR system. Refer to SIR Disabling and Enabling.