Pinpoint Test E: An Individual Demand Lamp Is Inoperative

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

E1 VERIFY THE INTERIOR LAMP OPERATION
NOTE: The battery saver relay must be activated during this test.
- Open the LF door.
- Verify all interior lamps illuminate.
- Do the interior lamps illuminate?
- Yes : GO to E2.
- No : GO to PINPOINT TEST A .

E2 CHECK CIRCUIT 54 (LG/YE) FOR AN OPEN

Key in OFF position.
Disconnect: Inoperative Demand Lamp.

Measure the voltage between the inoperative demand lamp connector, circuit 54 (LG/YE), harness side and ground as follows:

Fig 1: Measuring Voltage Between Inoperative Demand Lamp Connector, Circuit 54 (LG/YE), Harness Side And Ground

Courtesy of FORD MOTOR CO.

CONNECTOR-PIN SPECIFICATION

Suspect Interior Lamp	Connector-Pin	Circuit
Front interior/map lamp assembly (with full headliner)	C931-3	54 (LG/YE)
RH vanity mirror	C906-1	54 (LG/YE)
LH vanity mirror	C907-1	54 (LG/YE)
Front interior lamp	C981-3	54 (LG/YE)
Rear interior lamp	C901-3	54 (LG/YE)
Cargo lamp	C926-3	54 (LG/YE)
High mounted stoplamp	C475-3	54 (LG/YE)

Is the voltage greater than 10 volts at the inoperative demand lamp?

Yes : INSTALL a new lamp assembly. REFER to LAMP ASSEMBLY - INTERIOR (DOME LAMP) or LAMP ASSEMBLY - INTERIOR BODY (CARGO LAMP) (WITH HEADLINER) . TEST the system for normal operation.
No : REPAIR the circuit in question. TEST the system for normal operation.