Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
All dimmable illumination does not increase/decrease brightness	Wiring, terminals or connectors Instrument panel dimmer switch Body Control Module (BCM)	GO to Pinpoint Test A .
All dimmable non-networked illumination is inoperative	Wiring, terminals or connectors BCM	GO to Pinpoint Test B .
All dimmable non-networked illumination is always on	Wiring, terminals or connectors BCM	GO to Pinpoint Test C .
The steering wheel switch illumination is inoperative	Wiring, terminals or connectors Steering wheel switch(es) Steering wheel harness Clockspring	GO to Pinpoint Test D .
One or more switch illumination is inoperative	Wiring, terminals or connectors Illuminated switch	GO to Pinpoint Test E .
The window control switch illumination is inoperative	Window control switch	CHECK the operation of the power windows. If the power windows operate correctly, INSTALL a new window control switch. REFER to GLASS, FRAMES AND MECHANISMS . TEST the system for normal operation. If the power windows do not operate correctly, REFER to GLASS, FRAMES AND MECHANISMS .
All network controlled illumination does not dim	Medium Speed Controller Area Network (MS-CAN) BCM	CARRY OUT the network test. If the scan tool responds with no communication to any module on the MS-CAN, REFER to MODULE COMMUNICATIONS NETWORK . If the scan tool communicates with the modules on the MS-CAN, INSTALL a new BCM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
The Instrument Panel Cluster (IPC) illumination is inoperative	MS-CAN IPC	CARRY OUT the network test. If the scan tool responds with no communication with the IPC, REFER to MODULE COMMUNICATIONS NETWORK . If the scan tool communicates with the IPC, INSTALL a new IPC. REFER to INSTRUMENTATION, MESSAGE CENTER & WARNING CHIMES . TEST the system for normal operation.
The Front Control/Display Interface Module (FCDIM) illumination operate correctly	MS-CAN FCDIM	REFER to INFORMATION & ENTERTAINMENT SYSTEMS .