Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the smart junction box (SJB)	Fuse(s) Wiring, terminals or connectors SJB	REFER to MODULE COMMUNICATIONS NETWORK article.
The control illumination is inoperative - all hardwired illumination	Fuse Wiring, terminals or connectors 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 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 .
The window control switch illumination is inoperative	Wiring, terminals or connectors Window control switch	For MKX, go to Pinpoint Test E . For Edge, 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.
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 to any module on the MS-CAN, REFER to MODULE COMMUNICATIONS NETWORK article. If the scan tool communicates with the modules on the MS-CAN, INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
The instrument cluster (IC) illumination is inoperative	IC	CHECK the audio control module (ACM) illumination for correct operation. If the ACM illumination operates correctly, INSTALL a new IC. REFER to INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article. TEST the system for normal operation. If the ACM illumination does not operate correctly, REFER to MODULE COMMUNICATIONS NETWORK article to continue diagnosis of the communications network.
The audio control module (ACM) illumination is inoperative	ACM	CHECK the IC illumination for correct operation. If the IC illumination operates correctly, 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. If the IC illumination does not operate correctly, REFER to MODULE COMMUNICATIONS NETWORK article to continue diagnosis of the communications network.
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.
The HVAC module - EATC illumination is inoperative	HVAC module	CHECK the IC illumination for correct operation. If the IC illumination operates correctly, INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. TEST the system for normal operation. If the IC illumination does not operate correctly, REFER to MODULE COMMUNICATIONS NETWORK article to continue diagnosis of the communications network.
The individual component illumination is inoperative	Wiring, terminals or connectors Floor shifter LH rear heated seat switch (if equipped) RH rear heated seat switch (if equipped) Manual temperature control (if equipped) Message center switch (if equipped) Memory set switch (MKX) Window adjust switches (MKX) Headlamp switch Hazard/passenger air bag disable/traction control switch (if equipped) Door lock control switches Power liftgate release switch Roof opening panel switch (if equipped)	Go to Pinpoint Test E .