Symptom Chart

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the smart junction box (SJB)	Circuitry SJB	REFER to MULTIFUNCTION ELECTRONIC MODULES to continue diagnosis of the communication network.
The control illumination is inoperative	Smart junction box (SJB)	GO to PINPOINT TEST A .
The instrument cluster illumination is inoperative	Instrument cluster	CHECK the other illumination sources for correct operation. If the other illumination sources operate correctly, INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . 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	CHECK the other illumination sources for correct operation. If the other illumination sources operate correctly, REMOVE the audio unit. REFER to AUDIO UNIT . 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	CHECK the other illumination sources for correct operation. If the other illumination sources operate correctly, INSTALL a new EATC module. REFER to CONTROL COMPONENTS . 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	Circuitry Auxiliary climate control assembly	GO to PINPOINT TEST B .
The power window switch illumination is inoperative	Power window switch	CHECK the operation of the power windows. If the power windows operate correctly, INSTALL a new power window 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 to continue diagnosis of the power windows.
The power door lock switch illumination is inoperative	Power door lock switch	With the ignition switch in the ON position, MEASURE the voltage between the LH door lock switch C541-4, circuit 2086 (RD/LB), harness side and ground; or between the RH door lock switch C605-4, circuit 2086 (RD/LB), harness side and ground. If the voltage is greater than 10 volts, INSTALL a new power door lock switch. REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . TEST the system for normal operation. If the voltage is not greater than 10 volts, REPAIR circuit 2086 (RD/LB). TEST the system for normal operation.
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 Smart junction box (SJB)	GO to PINPOINT TEST D .
The control illumination is always on	Circuitry Smart junction box (SJB)	GO to PINPOINT TEST E .
The control illumination does not dim	Circuitry Instrument panel dimmer switch (part of the headlamp switch assembly) Smart junction box (SJB)	GO to PINPOINT TEST F .