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.
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HOMESERVICE MANUALSBUICK2007RAINIER AWD L6-4.2LREPAIR AND DIAGNOSISLIGHTING AND HORNSHORNTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESHORNS INOPERATIVE
2007 Buick Rainier AWD L6-4.2L
Horns Inoperative
2007 Buick Rainier AWD L6-4.2LSECTION Horns Inoperative
HORNS INOPERATIVE
TEST DESCRIPTION
Step 1 - Step 12:
Step 13 - Step 24:
The numbers below refer to the step numbers on the diagnostic table.
4. Verifies that the body control module (BCM) is providing ground to the horn relay.
5. Tests for voltage at the battery positive voltage terminal of the horn relay coil.
7. Tests for voltage at the battery positive voltage terminal of the horn relay switch. The HORN fuse supplies power to the battery positive voltage terminal of the horn relay switch.
15. The horns need maximum current flow to operate properly. A high resistance (greater than 0.5 ohms) in the horn control circuit or the horn ground circuit could cause operating problems with the horns. Check the circuits for faults that would restrict current flow.
17. The horn relay control circuit includes the horn switch. The horn switch is part of the inflatable restraint steering wheel module. The horn switch must be tested for a high resistance, an open or a short to voltage when testing the relay control circuit.
RENDER: 1.0x
NO RELATED
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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.