B2500 02 - 02

B2500 02

Microphone Short to Ground







Fault symptom
- "On Star System Malfunction. Contact Service." shown on SID.
- Microphone not functioning.

On-board diagnosis

Type of diagnosis:
- Continuous

Enable criteria:
- Ignition ON.
- Battery voltage must be between 9 - 16 V.
- No starter motor cranking.

Fault criteria:
- Control module input short circuit to ground.

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
- Check that the following MIs/Campaigns have been carried out before starting fault diagnosis:

US Market
- MI No. 391-2394 - Customer Satisfaction Campaign 15421 - Update of OnStar system.
- MI No. 391-2409 - Customer Satisfaction Campaign 15424 - Update of OnStar system.

CA Market
- MI No. 391-2410 - Customer Satisfaction Campaign 15421 - Update of OnStar system.
- MI No. 391-2408 - Customer Satisfaction Campaign 15424 - Update of OnStar system.