GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Steering 🢒 Steering Wheel and Column 🢒 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 in SIR.
  2. Remove the inflator module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.

    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

    Object Number: 395771 Size: SH
  1. Install the horn plunger to the steering wheel.

    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.

  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 in SIR.
  5. Enable the SIR system. Refer to SIR Disabling and Enabling in SIR.