The radio generates the audible warning through the left speaker. The radio receives audible warning requests via GMLAN serial data from the instrument panel cluster (IPC) or the body control module (BCM).

Schematic Reference

Connector End View Reference

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

Important: Before performing this diagnostics, make sure no indicator(s) are illuminated after the IPC performs a lamp test. If any indicators are illuminated after the bulb test, perform the indicator diagnostics before this diagnostics.

1. Ignition ON, radio ON, adjust the radio balance and fade to the left front speaker.

⇒	If the speaker does not operate properly, refer to Speakers Inoperative - One or More .

2. Ignition ON, verify that the scan tool Key In Ignition Status parameter is Key In.

⇒	If not Key In, test the signal circuit and ground for a short to voltage or an open/high resistance. If all circuits test normal, replace the ignition switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.