Microphone, handsfree malfunctioning

Read the instructions below then start the fault diagnostic procedure.

Symptom: Microphone does not work.

Microphone, handsfree malfunctioning

Fault symptoms

Microphone does not work.

Fault diagnosis

Note that the microphone has a high-level and a low-level output. Connecting the wrong microphone output can overdrive the unit or give too low a signal level.

Check the 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.