Symptom Chart

NOTE: Refer to DESCRIPTION AND OPERATION , INTELLIGENT ACCESS (IA) WITH PUSH BUTTON START to review the procedures for achieving the various ignition states (ignition off, ignition in accessory, ignition on, ignition start) on vehicles with this feature.

SYMPTOM CHART

Condition	Possible Sources	Action
All dimmable illumination does not dim increase brightness	Wiring, terminals or connectors Instrument panel dimmer switch SJB	Refer to PINPOINT TEST A .
All dimmable switch illumination is inoperative	Fuse Wiring, terminals or connectors SJB	Refer to PINPOINT TEST B .
All dimmable switch illumination is always on	Wiring, terminals or connectors SJB	Refer to PINPOINT TEST C .
The steering wheel switch illumination is inoperative	Wiring, terminals or connectors Steering wheel switch Steering wheel harness Clockspring	Refer to PINPOINT TEST D .
One or more switch illumination is inoperative	Wiring, terminals or connectors Adjustable pedal switch Ambient lighting switch (if equipped) Instrument panel dimmer switch SJB Floor shifter Rear heated seat switches Rear sunshade switch Hazard flasher lamp switch Headlamp switch Message center switch Roof opening panel switch (if equipped) Door lock control switches Start/stop switch Window control switches	Refer to PINPOINT TEST E .
All network controlled illumination is inoperative/does not dim	Medium Speed Controller Area Network (MS-CAN) SJB	CARRY OUT the network test. If the scan tool responds with no communication to the SJB, REFER to MODULE COMMUNICATIONS NETWORK Article. If the scan tool communicates with the SJB, INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULE Article. TEST the system for normal operation.
The Instrument Panel Cluster (IPC) illumination is inoperative/does not dim	MS-CAN 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 Front Controls Interface Module (FCIM) illumination is inoperative/does not dim	FCIM MS-CAN	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) illumination is inoperative/does not dim (vehicles without navigation)	MS-CAN 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 Front Display Interface Module (FDIM) illumination is inoperative/does not dim (vehicles with navigation)	FDIM MS-CAN	REFER to INFORMATION SYSTEM AND ENTERTAINMENT SYSTEM Article.