Pinpoint Test E: The Demand Lighting Is Inoperative

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Interior Lamps for schematic and connector information.

Normal Operation 

The lighting control module (LCM) provides power to the demand lamps through circuit 705 (LG/OG). The demand lamps are grounded through circuit 57 (BK). The demand lamps remain powered for a predetermined amount of time. Once that timeout has been reached, the LCM removes voltage from circuit 705 (LG/OG).

This pinpoint test is intended to diagnose the following:

• Wiring, terminals or connectors
• LCM

PINPOINT TEST E: THE DEMAND LIGHTING IS INOPERATIVE 

1. E1 CHECK THE INTERIOR LAMP OPERATION 
   • Key in OFF position.
   • Open the driver door.
   • Do the interior lamps illuminate? 
   1. YES  : Go to  E2.
   2. NO  : Go to Pinpoint Test A .
2. E2 CHECK CIRCUIT 705 (LG/OG) FOR AN OPEN 
   Fig 1: Connecting Fused Jumper Wire
   Courtesy of FORD MOTOR CO.
   NOTE: If the fuse fails, repair circuit 705 (LG/OG) for a short to ground.
   • Connect a fused (5A) jumper wire between the LCM C2145c-4, circuit 54 (LG/YE), harness side and the LCM C2145c-18, circuit 705 (LG/OG), harness side.
   • Do the demand lamps illuminate? 
   1. YES  : REMOVE the jumper wire. Go to  E3.
   2. NO  : REMOVE the jumper wire. REPAIR the circuit. TEST the system for normal operation.
3. E3 CHECK FOR CORRECT LCM OPERATION 
   • Disconnect all the LCM connectors.
   • Check for:
     • corrosion
     • damaged pins
     • pushed-out pins
   • Connect all the LCM connectors and make sure they seat correctly.
   • Operate the system and verify the concern is still present.
   • Is the concern still present? 
   1. YES  : INSTALL a new LCM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
   2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.