Diagnostic Instructions
Circuit/System Description
The hazard flashers may be activated in any power mode. The hazard switch is integrated into the driver information display panel. When the hazard switch is placed in the ON position, the radio communicates via serial data with the body control module
(BCM) requesting the hazard lamps be activated. 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.
Reference Information
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
Circuit/System Verification
Ignition ON, observe the scan tool Hazard Switch Status parameter while pressing and depressing the hazard switch. The parameter should change between Active and Inactive.
| ⇒ | If the parameter changes as the switch is activated, replace the BCM. |
| ⇒ | If the parameter does not change as the switch is activated, replace the driver information display. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
