Chevrolet Silverado / GMC Sierra. Service manual — part 2295

If greater than the specified range, test the control circuit for a high resistance.

5. If all circuits test normal, test or replace the horn.

Component Testing

Horn

1. Ignition OFF, disconnect the harness connector at the appropriate horn.

2. Install a 10A fused jumper wire between the control terminal B and 12 volts.

3. Install a jumper wire between the ground terminal A and ground. Verify the horn emits a

clear and even tone.

If the sound emitted is not clear and even, replace the horn.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Underhood Electrical Center or Junction Block Bracket Replacement

Horn Replacement - Left Side (GMC) or Horn Replacement - Left Side (Chevrolet)

Horn Replacement - Right Side (GMC) or Horn Replacement - Right Side
(Chevrolet)

Steering Wheel Horn Switch Replacement

Control Module References for BCM replacement, setup, and programming

REPAIR INSTRUCTIONS

HORN REPLACEMENT - LEFT SIDE (GMC)

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Horns - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 2: Horn - Left Side (GMC)
Courtesy of GENERAL MOTORS CORP.

HORN REPLACEMENT - LEFT SIDE (CHEVROLET)

Callout

Component Name

Preliminary Procedure:
Remove the front bumper fascia trim cap. Refer to Front Bumper Fascia Trim Cap
Replacement (GMC) .

1

Left Side Horn Bolt

Tighten: 9 N.m (80 lb in)

NOTE:

Refer to Fastener Notice .

2

Left Side Horn
Tip: Disconnect the electrical connector.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Horns - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 3: Horn - Left Side (Chevrolet)
Courtesy of GENERAL MOTORS CORP.

HORN REPLACEMENT - RIGHT SIDE (GMC)

Callout

Component Name

Preliminary Procedure:
Remove the headlamp. Refer to Headlamp Replacement (GMC HD) or Headlamp
Replacement (Chevrolet) .

1

Left Side Horn Bolt

Tighten: 9 N.m (80 lb in)

NOTE:

Refer to Fastener Notice .

2

Left Side Horn
Tip: Disconnect the electrical connector.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Horns - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 4: Horn - Right Side (GMC)
Courtesy of GENERAL MOTORS CORP.

HORN REPLACEMENT - RIGHT SIDE (CHEVROLET)

Callout

Component Name

Preliminary Procedure:
Remove the front bumper fascia trim cap. Refer to Front Bumper Fascia Trim Cap
Replacement (GMC) .

1

Right Side Horn Bolt

Tighten: 9 N.m (80 lb in)

NOTE:

Refer to Fastener Notice .

2

Right Side Horn
Tip: Disconnect the electrical connector.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Horns - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado