Symptom Chart

Condition	Possible Sources	Action
No communication with the instrument cluster	Fuse(s) Circuitry Instrument cluster	REFER to MODULE COMMUNICATIONS NETWORK article.
No communication with the smart junction box (SJB)	Fuse(s) Circuitry SJB	REFER to MODULE COMMUNICATIONS NETWORK article.
The control illumination is inoperative	SJB	Go to Pinpoint Test A .
The instrument cluster illumination is inoperative	Instrument cluster SJB	CHECK the other illumination sources for correct operation. If the other illumination sources operate correctly, INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER article. TEST the system for normal operation. If the other illumination sources do not operate correctly, go to Pinpoint Test A .
The audio unit illumination is inoperative	Audio unit SJB	CHECK the other illumination sources for correct operation. If the other illumination sources operate correctly, REMOVE the audio unit. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS article. SEND it to an authorized repair facility. TEST the system for normal operation after the repair. If the other illumination sources do not operate correctly, go to Pinpoint Test A .
The electronic automatic temperature control (EATC) illumination is inoperative	EATC module SJB	CHECK the other illumination sources for correct operation. If the other illumination sources operate correctly, INSTALL a new EATC module. REFER to CLIMATE CONTROL article. TEST the system for normal operation. If the other illumination sources do not operate correctly, go to Pinpoint Test A .
The auxiliary climate control illumination is inoperative	Fuse Circuitry Auxiliary climate control	Go to Pinpoint Test B .
The window control switch(es) illumination is inoperative	Window control switch(es)	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 door lock control switch illumination is inoperative	Fuse Circuitry Door lock control switch	Go to Pinpoint Test G .
The keypad switch illumination is inoperative	Circuitry Keypad switch SJB	Go to Pinpoint Test H .
The steering wheel control illumination is inoperative	Circuitry Clockspring Steering wheel controls	Go to Pinpoint Test C .
One or more module-controlled illumination source(s) is inoperative	Circuitry Illumination source SJB	Go to Pinpoint Test D .
The control illumination is always on	Circuitry SJB	Go to Pinpoint Test E .
The instrument panel illumination does not dim	Circuitry Instrument panel dimmer switch (part of the headlamp switch assembly) SJB	Go to Pinpoint Test F .