Mobile Telephone on Handsfree Not Charging

Microphone, Handsfree Malfunctioning:

Fault symptoms
Charging of the mobile phone batteries does not work.

Diagnostic help
Applies to the handsfree unit with charging function.

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.