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Pinpoint Test J: The Courtesy Lamps Stay On Continuously - Luggage Compartment Lamps

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.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Luggage Compartment for schematic and connector information.

Normal Operation 

The luggage compartment lamps are controlled by the lighting control module (LCM). The LCM receives a signal from the luggage compartment lid ajar switch through the trunk pull-down module or the luggage/trunk module (LTM), if equipped with a power luggage compartment lid. When the luggage compartment lid is opened, the luggage compartment lid ajar switch closes and signals the trunk pull-down module or the LTM, if equipped with a power luggage compartment lid through circuit 486 (BN/WH). The trunk pull-down module or the LTM, if equipped with a power luggage compartment lid signals the LCM through circuit 700 (WH/VT) to request luggage lamp operation. The luggage lamps are supplied voltage through circuit 705 (LG/OG). The LCM controls the ground side of the luggage compartment lamps through circuit 707 (WH/YE).

This pinpoint test is intended to diagnose the following: 

PINPOINT TEST J: THE COURTESY LAMPS STAY ON CONTINUOUSLY - LUGGAGE COMPARTMENT LAMPS 

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. J1 CHECK THE TRUNK PULL-DOWN MODULE OR LTM 
    • Key in OFF position.
    • Close the decklid.
    • Disconnect: Trunk Pull-Down Module C4197 (Power Striker) or LTM C4081a (Power Decklid)
    • Do the luggage compartment lamps turn off? 
    1. YES  : Go to  J2.
    2. NO  : Go to  J4.
  2. J2 CHECK THE LUGGAGE COMPARTMENT LID RELEASE SOLENOID 
    • Connect: Trunk Pull-Down Module C4197 (Power Striker) or LTM C4081a (Power Decklid)
    • Disconnect: Luggage Compartment Lid Release Solenoid C430
    • Do the luggage compartment lamps turn off? 
    1. YES  : INSTALL a new luggage compartment latch. REFER to HANDLES, LOCKS, LATCHES & ENTRY SYSTEMS article. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  J3.
  3. J3 CHECK CIRCUIT 486 (BN/WH) FOR A SHORT TO GROUND 
    • Disconnect: Trunk Pull-Down Module C4197 (Power Striker) or LTM C4081a (Power Decklid)
      • Fig 1: Checking Circuit For Short To Ground
      GF0019115Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a power striker, measure the resistance between the trunk pull-down module C4197-3, circuit 486 (BN/WH), harness side and ground.
      • Fig 2: Checking Circuit For Short To Ground
      GF0019116Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a power decklid, measure the resistance between the trunk pull-down module C4081a-4, circuit 486 (BN/WH), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  J6.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. J4 CHECK CIRCUIT 700 (WH/VT) FOR A SHORT TO GROUND 
    • Disconnect: LCM C2145b
      • Fig 3: Checking Circuit For Short To Ground
      GF0019117Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LCM C2145b-4, circuit 700 (WH/VT), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  J5.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  5. J5 CHECK CIRCUIT 707 (WH/YE) FOR A SHORT TO GROUND 
    • Disconnect: Luggage Compartment Lamps C428 and C4198
      • Fig 4: Checking Circuit For Short To Ground
      GF0019118Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LCM C2145d-9, circuit 707 (WH/YE), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  J7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. J6 CHECK FOR CORRECT TRUNK PULL-DOWN MODULE OR LTM OPERATION 
    • Disconnect all the trunk pull-down module or LTM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the trunk pull-down module or LTM 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 trunk pull-down module or LTM. REFER to BODY CLOSURES article, Luggage Compartment Lid Closing Motor. 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. CLEAR the DTCs. REPEAT the self-test.
  7. J7 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. CLEAR the DTCs. REPEAT the self-test.
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