Symptom Chart

Condition	Possible Sources	Action
No communication with the smart junction box (SJB)	Fuse Wiring, terminals or connectors SJB	REFER to MODULE COMMUNICATIONS NETWORK article.
The control illumination is inoperative - all hardwired illumination	Fuse Wiring, terminals or connectors Auxiliary climate control assembly SJB	Go to Pinpoint Test A .
The control illumination is always on - all hardwired illumination	Wiring, terminals or connectors SJB	Go to Pinpoint Test B .
All instrument panel illumination does not dim	Wiring, terminals or connectors Instrument panel dimmer switch SJB	Go to Pinpoint Test C .
The window control switch illumination is inoperative - Expedition only	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 article. TEST the system for normal operation. If the power windows do not operate correctly, REFER to GLASS, FRAMES AND MECHANISMS article.
The steering wheel control illumination is inoperative	Wiring, terminals or connectors Steering wheel control switch(es) Steering wheel control switch harness Clockspring	Go to Pinpoint Test D .
All network controlled illumination does not dim	MS-CAN network SJB	CARRY OUT the network test. If the scan tool responds with no communication to any module on the MS-CAN network, REFER to MODULE COMMUNICATIONS NETWORK article. If the scan tool communicates with the modules on the MS-CAN network, INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
The instrument cluster (IC) illumination is inoperative	Instrument cluster (IC)	INSTALL a new instrument cluster (IC). REFER to INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article. TEST the system for normal operation.
The audio control module (ACM) illumination is inoperative	ACM	REMOVE the ACM. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS article. SEND it to an authorized repair facility. TEST the system for normal operation after the repair.
The heating ventilation air conditioning (HVAC) module illumination is inoperative	HVAC module	INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
The rear entertainment module (RETM) illumination is inoperative	RETM	REMOVE the RETM. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS article. SEND it to an authorized repair facility. TEST the system for normal operation after the repair.
The individual component illumination is inoperative	Wiring, terminals or connectors Adjustable pedal switch Ash receptacle (Navigator only) Auxiliary climate control assembly (Expedition only) Clock (Navigator only) Door lock control switch Floor Shifter Four wheel drive (4WD) switch Headlamp switch Illumination source Message center switch Overhead console Power liftgate/traction control/hazard switch Power window control switch (Navigator only)	Go to Pinpoint Test E .