Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 38 (HORN SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESHORNS ALWAYS ONCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the HORN fuse from the underhood fuse block. The horns should turn OFF
- If the horns remain on, repair the short to voltage in the horn control circuit.
- Ignition OFF, disconnect the BCM connector C5.
- Test for a ground signal at the horn relay control terminal of the BCM connector.
- If a ground signal is not present, replace the underhood fuse block.
- Ignition OFF, disconnect the horn switch and test the switch for shorted contacts.
- If the switch does not function properly, replace.
- Test for a short to ground in the horn relay control circuit.
- If the circuits/connectors test normal, replace the BCM.
IMPORTANT:
The horn switch is located under the inflatable restraint steering wheel module. To disable the SIR system refer to SIR Disabling and Enabling
.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.