CU GSM / B2500 04
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Microphone not functioning.
Microphone Circuit Open
Fault symptom
Microphone not functioning.
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Battery voltage must be between 9 - 16 V. |
| No starter motor cranking. |
Fault criteria:
| Break in microphone circuit. |
Checking the wiring harness
Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.
Diagnostic help
Diagnosis regards:
| Electrical fault in connecting leads or component. |
