Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
All dimmable illumination does not dim/increase brightness	Wiring, terminals or connectors Instrument panel dimmer switch 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 control switch Steering wheel harness Clockspring	GO to PINPOINT TEST D .
The window control switch illumination is inoperative	Wiring, terminals or connectors Window control switch	For MKZ, GO to PINPOINT TEST E . For Fusion, 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 . TEST the system for normal operation. If the power windows do not operate correctly, REFER to GLASS, FRAMES AND MECHANISMS .
One or more switch illumination is inoperative	Wiring, terminals or connectors Ambient lighting/traction control switch (Fusion) Cigar lighter (MKZ) Deck lid release switch Door lock control switches (MKZ) Hazard flasher lamp switch (Fusion) Headlamp switch Instrument panel dimmer switch Memory set switch (MKZ) Message center switch Roof opening panel switch (if equipped) Floor shifter Window control switches (MKZ) Door lock control switches (MKZ) SJB	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 . If the scan tool communicates with the SJB, INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
The Instrument Panel Cluster (IPC) illumination is inoperative/does not dim	IPC	CARRY OUT the network test. If the scan tool responds with no communication with the IPC, REFER to MODULE COMMUNICATIONS NETWORK . If the scan tool communicates with the IPC, INSTALL a new IPC. REFER to INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES . TEST the system for normal operation.
The Audio Control Module (ACM) illumination is inoperative/does not dim	ACM	CARRY OUT the network test. If the scan tool responds with no communication with the ACM, REFER to MODULE COMMUNICATIONS NETWORK . If the scan tool communicates with the ACM, INSTALL a new ACM. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.
The Front Controls Interface Module (FCIM) illumination is inoperative/does not dim	FCIM	CARRY OUT the network test. If the scan tool responds with no communication with the FCIM, REFER to MODULE COMMUNICATIONS NETWORK . If the scan tool communicates with the FCIM, INSTALL a new FCIM. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.
The Front Display Interface Module (FDIM) illumination is inoperative/does not dim (vehicles without navigation)	FDIM	CARRY OUT the network test. If the scan tool responds with no communication with the FDIM, REFER to MODULE COMMUNICATIONS NETWORK . If the scan tool communicates with the FDIM, INSTALL a new FDIM. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.
The Front Display Interface Module (FDIM) illumination is inoperative/does not dim (vehicles with navigation)	FDIM	REFER to INFORMATION AND ENTERTAINMENT SYSTEMS to continue diagnosis.
The HVAC module illumination is inoperative/does not dim	HVAC module	CARRY OUT the network test. If the scan tool responds with no communication with the HVAC module, REFER to MODULE COMMUNICATIONS NETWORK . If the scan tool communicates with the HVAC module, INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.