The hazard flashers may be activated in any power mode. The instrument panel module (IPM) monitors the signal circuit of the hazard switch. When the hazard switch is placed in the ON position, the switch contacts close and battery positive voltage from the IPM flows through the hazard switch to G201. The rear integration module (RIM) turn lamp supply voltage circuit is also provided with ground through the hazard switch when the contacts close at G201 which in turn illuminates the hazard switch LED. The IPM relays the hazard switch status to the rear integration module (RIM) via the serial data circuit. The RIM uses the status of the hazard switch to command the turn signals ON and OFF. The RIM controls both front and rear turn signals. The IPM sends a serial data message to the instrument panel cluster (IPC) to enable both turn signal indicators in an ON and OFF duty cycle when the hazard switch is placed in the ON position. Voltage is supplied to the front and rear turn signals by the RIM. Ground is provided to the front turn signals at G104. The rear turn signals are grounded at G401 and G402.

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 that a test lamp illuminates between B+ and the ground circuit terminal 2.

⇒	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 1 for a short to ground. If the circuit tests normal, replace the IPM.

4. Install a 3A fused jumper wire between the signal circuit terminal 1 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 IPM.

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

Hazard Lamp Indicator Malfunction

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

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

3. Ignition ON, park lamps ON, verify that a test lamp illuminates between the circuit terminal 4 and ground.

⇒	If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the RIM.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the RIM.

4. If all circuits test normal, test or replace the hazard switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.