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OnStar / B2455 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Can dial out. You cannot be heard, but the other party can be heard.

  B2455 00


Microphone Circuit Malfunction

Fault symptom

Can dial out. You cannot be heard, but the other party can be heard.

On-board diagnosis

Enable criteria:

Turn Ignition On
Battery voltage must be between 9 - 16 V.

Fault criteria:

Microphone Circuit Open

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

Electrical fault in connecting leads or component.