Mute Function For Incoming or Outgoing Telephone Call

The Mute Function For Incoming Or Outgoing Telephone Call Does Not Work. Incoming Telephone Sound Is Not Relayed Through The Speakers.







Fault symptoms
The mute function for incoming and outgoing telephone calls does not work.
The incoming sound is not relayed through the speakers.

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

Checking the wiring harness
Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring. Observe the multimeter, test lamp or diagnostic instrument while carrying out this check.