Symptom Chart

Condition	Possible Sources	Actions
A module does not respond to the diagnostic scan tool	Fuse Wiring, terminals or connectors Module	REFER to: COMMUNICATIONS NETWORK .
All dimmable illumination (networked and non-networked sources) does not dim or increase brightness	Refer to the PINPOINT TESTS	GO to PINPOINT TEST A
All dimmable non-networked illumination is inoperative (networked illumination functions correctly)	Refer to the PINPOINT TESTS	GO to PINPOINT TEST B
All dimmable non-networked illumination is always on (networked illumination functions correctly)	Refer to the PINPOINT TESTS	GO to PINPOINT TEST C
All dimmable networked illumination (non-networked illumination functions correctly) does not dim	Network communication concern BCM	Using a diagnostic scan tool, PERFORM a network test. If the diagnostic scan tool responds with no communication to any module on the MS-CAN , REFER to: COMMUNICATIONS NETWORK . If the diagnostic scan tool communicates with the modules on the MS-CAN , INSTALL a new BCM . REFER to: BODY CONTROL MODULE (BCM) .
The steering wheel switch (es) illumination is inoperative	Refer to the PINPOINT TESTS	GO to PINPOINT TEST D
One or more switch or component illumination is inoperative	Refer to the PINPOINT TESTS	GO to PINPOINT TEST E
The start/stop switch illumination is inoperative or always on (vehicles with push button start)	Refer to the PINPOINT TESTS	GO to PINPOINT TEST F
The window control switch illumination is inoperative	Wiring, terminals or connectors Window control switch	VERIFY the operation of the power windows. If the power windows operate correctly, INSTALL a new window control switch. REFER to: FRONT DOOR WINDOW CONTROL SWITCH . REFER to: REAR DOOR WINDOW CONTROL SWITCH . If the power windows do not operate correctly, REFER to: GLASS, FRAMES AND MECHANISMS - VEHICLES WITH: FRONT MANUAL WINDOWS .
The IPC illumination is inoperative/does not dim	Network communication concern IPC	Using a diagnostic scan tool, PERFORM a network test. If the IPC passes the network test, INSTALL a new IPC . REFER to: INSTRUMENT PANEL CLUSTER (IPC) . If the diagnostic scan tool responds with no communication with the IPC , REFER to: COMMUNICATIONS NETWORK .
The FCIM illumination is inoperative/does not dim (without touchscreen display)	Refer to the PINPOINT TESTS	GO to PINPOINT TEST G
The FCIM illumination is inoperative/does not dim (with touchscreen display)	Network communication concern FCIM	VERIFY the operation of the audio system. If the audio system operates correctly, INSTALL a new FCIM . REFER to: FRONT CONTROLS INTERFACE MODULE (FCIM) . If the audio system does not operate correctly, REFER to: INFORMATION AND ENTERTAINMENT SYSTEM .
The FCDIM illumination is inoperative/does not dim	Network communication concern FCDIM	VERIFY the operation of the audio system. If the audio system operates correctly, INSTALL a new FCDIM . REFER to: FRONT CONTROL/DISPLAY INTERFACE MODULE (FCDIM) . REFER to: FRONT CONTROL/DISPLAY INTERFACE MODULE (FCDIM) . If the audio system does not operate correctly, REFER to: INFORMATION AND ENTERTAINMENT SYSTEM .
The FDIM illumination is inoperative/does not dim	APIM FDIM	VERIFY the audio system can be operated from the FDIM . If the audio system operates correctly from FDIM inputs, refer to APIM HARDWARE TESTING . If the FDIM illumination still does not function correctly after the repair, INSTALL a new FDIM . REFER to: FRONT DISPLAY INTERFACE MODULE (FDIM) . If the audio system does not operate correctly from FDIM inputs, REFER to: INFORMATION AND ENTERTAINMENT SYSTEM .
The HVAC illumination is inoperative/does not dim (EMTC )	Refer to the PINPOINT TESTS	GO to PINPOINT TEST E
The HVAC illumination is inoperative/does not dim (EATC )	Network communication concern HVAC	Using a diagnostic scan tool, PERFORM a network test. If the HVAC module passes the network test, INSTALL a new HVAC module. REFER to: HEATING, VENTILATION AND AIR CONDITIONING (HVAC) CONTROL MODULE . If the HVAC module does not pass the network test, REFER to: COMMUNICATIONS NETWORK .