Circuit/System Verification
WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, connect a test lamp between the HORN fuse test point and ground.
- Press and release the horn switch. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp is always ON or always OFF, refer to Horn Switch Circuit Test under Circuit/System Testing .
- Ignition ON, command the Horn ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp is always OFF, replace the BCM.
- Connect a 10A fused jumper wire between B+ and the HORN fuse test point. The horn should sound and emit a clear and even tone.
- If the horn does not sound, refer to Horn Circuit Test under Circuit/System Testing .
- If the sound emitted is not clear and even, refer to Horn - Poor Tone under Circuit/System Testing .