Horn failure/Steering wheel switch unit failure

Read the instructions below then start the fault diagnostic procedure.

Symptom: The horn does not work and there is no diagnostic trouble code. Some of the steering wheel control buttons do not work, no diagnostic trouble code.

Horn failure/Steering wheel switch unit failure

Diagnostic help

The horn button can be read with the diagnostics tool.

The horn output can be activated with the diagnostics tool.

Check wiring harness.

Jiggle the wiring harness at several points and in different directions to reveal intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic instrument during the test.