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Pinpoint Test E: The Demand Lighting Is Inoperative

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

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 until the battery saver feature times out. Once that timeout has been reached, then the LCM removes voltage from circuit 705 (LG/OG).

This pinpoint test is intended to diagnose the following: 

PINPOINT TEST E: THE DEMAND LIGHTING IS INOPERATIVE 

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. E1 CHECK THE COURTESY LAMP OPERATION 
    • Key in OFF position.
    • Open the driver door.
    • Do the courtesy lamps illuminate? 
    1. YES  : Go to  E2.
    2. NO  : Go to Pinpoint Test A .
  2. E2 CHECK CIRCUIT 705 (LG/OG) FOR AN OPEN 
    • Disconnect: LCM C2145c
      • Fig 1: Connecting Fused Jumper Wire
      GF0014621Courtesy of FORD MOTOR CO.
      NOTE: If the fuse fails, repair circuit 705 (LG/OG) for a short to ground.
    • Connect a fused (15A) 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 CIRCUIT 57 (BK) FOR AN OPEN 
    • Open the glove compartment.
    • Does the glove compartment lamp illuminate? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  E4.
  4. E4 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.
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