The hazard flashers may be activated in any power mode. The hazard switch is located on the lower center console panel and is permanently grounded through G203. When the hazard switch is placed in the ON position, ground is applied through the hazard switch signal circuit to the body control module (BCM). The BCM supplies battery voltage to all four turn signal lamps in an ON and OFF duty cycle. When the hazard switch is activated, the BCM sends a serial data message to the instrument panel cluster (IPC) requesting both turn signal indicators to be cycled ON and OFF.

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Hazard Lamps Malfunction

1. Ignition OFF, disconnect the harness connector at the hazard switch.
2. Ignition OFF, verify a test lamp illuminates between B+ and the ground circuit terminal B.

⇒	If the test lamp does not illuminate, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Hazard Lamp Switch parameter is INACTIVE.

⇒	If not the specified value, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM.

4. Install a 3A fused jumper wire between the signal circuit terminal C and ground. Verify the scan tool hazard lamp switch parameter is ACTIVE.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

5. If all circuits test normal, replace the hazard switch.

Hazard Lamp Indicators Malfunction

Ignition ON, with a scan tool perform the Lamp Test for the instrument panel cluster (IPC) and observe the turn signal lamp indicators.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.