Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
All dimmable illumination does not dim	Wiring, terminals or connectors Instrument panel dimmer switch Smart Junction Box (SJB)	GO to PINPOINT TEST A .
All dimmable switch illumination is inoperative	Fuse Wiring, terminals or connectors SJB	GO to PINPOINT TEST B .
All dimmable switch illumination is always on	Wiring, terminals or connectors SJB	GO to PINPOINT TEST C .
The steering wheel control illumination is inoperative	Wiring, terminals or connectors Steering wheel switches Steering wheel harness Clockspring	GO to PINPOINT TEST D .
One or more control switch illumination is inoperative	Wiring, terminals or connectors Illuminated switch	GO to PINPOINT TEST E .
All network controlled illumination does not dim	Medium Speed Controller Area Network (MS-CAN) SJB	CARRY OUT the network test. If the scan tool responds with no communication with the SJB, REFER to MODULE COMMUNICATIONS NETWORK article. If the scan tool communicates with the SJB, INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES -- MKS article. TEST the system for normal operation.
The Instrument Panel Cluster (IPC) illumination is inoperative	IPC	CARRY OUT the network test. If the scan tool responds with no communication with the IPC, REFER to MODULE COMMUNICATIONS NETWORK article. If the scan tool communicates with the IPC, INSTALL a new IPC. REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article. TEST the system for normal operation.
The HVAC module (vehicles without navigation) illumination is inoperative	HVAC module	CARRY OUT the network test. If the scan tool responds with no communication with the HVAC module, REFER to MODULE COMMUNICATIONS NETWORK article. If the scan tool communicates with the HVAC module, INSTALL a new HVAC module. REFER to HVAC - CLIMATE CONTROL SYSTEM article. TEST the system for normal operation.
The Front Controls Interface Module (FCIM) illumination is inoperative	FCIM	CARRY OUT the network test. If the scan tool responds with no communication with the FCIM, REFER to MODULE COMMUNICATIONS NETWORK article. If the scan tool communicates with the FCIM, INSTALL a new FCIM. REFER to INFORMATION SYSTEM AND ENTERTAINMENT SYSTEM article. TEST the system for normal operation.
The Front Display Interface Module (FDIM) (vehicles without navigation) illumination is inoperative	FDIM	CARRY OUT the network test. If the scan tool responds with no communication with the FDIM, REFER to MODULE COMMUNICATIONS NETWORK article. If the scan tool communicates with the FDIM, INSTALL a new FDIM. REFER to INFORMATION SYSTEM AND ENTERTAINMENT SYSTEM article. TEST the system for normal operation.
The Audio Control Module (ACM) (vehicles with navigation) illumination is inoperative	ACM	CARRY OUT the network test. If the scan tool responds with no communication with the ACM, REFER to MODULE COMMUNICATIONS NETWORK article. If the scan tool communicates with the ACM, INSTALL a new ACM. REFER to INFORMATION SYSTEM AND ENTERTAINMENT SYSTEM article. TEST the system for normal operation.