The MUTE function not working

Read the instructions below then start the fault diagnostic procedure.

Symptom: Mute function on incoming and outgoing telephone calls does not work. Incoming sound is not relayed through the loudspeakers.

The MUTE function not working

Fault symptoms

Mute function on incoming and outgoing telephone calls does not work.

Incoming sound is not relayed through the loudspeakers.

Diagnostic help

Applies to handsfree units with mute function and/or line output.

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.