PRE-RELEASE
CU AMPS / B2500 01
Read the instructions below then start the fault diagnostic procedure.
Symptom: "On Star System Malfunction. Contact Service." shown on the display. Microphone not functioning.
| B2500 01 |
Microphone Short to B+
Fault symptom
"On Star System Malfunction. Contact Service." shown on the display.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 B+. |
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.
