Pinpoint Test C: One Or More Module-Controlled Illumination Source(S) Is Inoperative

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

C1 CHECK THE VOLTAGE TO THE SINGLE ILLUMINATION SOURCE

Key in OFF position.
Disconnect: Inoperative Illumination Source.
With the parking lamps ON, rotate the instrument panel dimmer switch to the full illumination position.

Measure the voltage between the inoperative illumination source, harness side and ground as follows:

CONNECTOR - PIN CIRCUIT

Component	Connector - Pin	Circuit
Floor shifter	C3245-3	VLN04 (VT/GY)
Manual climate control	C2357a-2	VLN04 (VT/GY)
Memory seat switch	C503-3	VLN04 (VT/GY)
Headlamp switch	C205-5	VLN04 (VT/GY)
Clock	C2016-2	VLN04 (VT/GY)
Message center switch	C253-1	VLN04 (VT/GY)
Traction control switch	C2355-6	VLN04 (VT/GY)
Luggage compartment lid release switch	C2269-3	VLN04 (VT/GY)
LH front window control switch	C535a-6	VLN04 (VT/GY)
RH front window control switch	C624-1	VLN04 (VT/GY)
LH rear window control switch	C701-4	VLN04 (VT/GY)
RH rear window control switch	C819-4	VLN04 (VT/GY)
LH door lock control switch	C505-2	VLN04 (VT/GY)
RH door lock control switch	C605-2	VLN04 (VT/GY)

Is the voltage greater than 10 volts?

Yes : GO to C2.

No : REPAIR the circuit in question. TEST the system for normal operation.

C2 CHECK ILLUMINATION SOURCE GROUND CIRCUIT FOR AN OPEN

Key in OFF position.

Measure the resistance between the inoperative illumination source, harness side and ground as follows:

CONNECTOR - PIN CIRCUIT

Component	Connector - Pin	Circuit
Floor shifter	C3245-4	GD116 (BK/VT)
Manual climate control	C2357a-1	GD116 (BK/VT)
Memory seat switch	C503-7	GD126 (BK/WH)
Headlamp switch	C205-10	GD116 (BK/VT)
Clock	C2016-5	GD116 (BK/VT)
Message center switch	C253-4	GD116 (BK/VT)
Traction Control switch	C2355-1	GD116 (BK/VT)
Luggage compartment lid release switch	C2269-2	GD116 (BK/VT)
LH front window control switch	C535b-6	GD126 (BK/WH)
RH front window control switch	C624-6	GD139 (BK/YE)
LH rear window control switch	C701-1 C701-6	CPW15 (YE) CPW16 (BU/OG)
RH rear window control switch	C819-1 C819-6	CPW17 (BN/GN) CPW18 (GY/VT)
LH door lock control switch	C505- 4	GD126 (BK/WH)
RH door lock control switch	C605-4	GD139 (BK/YE)

Is the resistance less than 5 ohms?

Yes : INSTALL a new component in question. TEST the system for normal operation.

No : REPAIR the circuit. TEST the system for normal operation.