The Body Control Module (BCM) controls the hazard lamps based an input from the hazard lamp switch. When the hazard lamp switch is depressed, a ground signal is provided to the BCM on the hazard switch signal circuit. This indicates to the BCM that the hazard lamps are requested. The BCM will then activate the hazards lamps by pulsing the turn signal lamp supply voltage circuits.

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

1. Ignition ON, operate the left and right turn signals using the multifunction turn signal lever. Each of the turn signal lamps should pulse when commanded ON by the lever.

⇒	If the turn signal lamps do not function as specified, refer to Turn Signal Lamps and/or Indicators Malfunction .

2. Observe the scan tool Hazard Switch Signal parameter while cycling the hazard lamp switch ON and OFF. The parameter should change between On and Off.

1. Ignition OFF, disconnect the harness connector at the Driver Information Center (DIC).
2. Test for less than 10 ohms between the ground circuit terminal 4 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Hazard Switch Signal parameter is Off.

⇒	If not the specified value, test the signal circuit terminal 2 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 2 and ground. Verify the scan tool Hazard Switch Signal parameter is On.

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

5. If all circuits test normal, test or replace the DIC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.