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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1609 (Interior Lighting System) >> Diagnostic Tests >> Interior Lighting >> Pinpoint Tests >> Pinpoint Test H: The Luggage Compartment Lamps Are Inoperative

Pinpoint Test H: The Luggage Compartment Lamps Are 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.

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 through circuit 486 (BN/WH). The trunk pull-down module, or the LTM 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 H: THE LUGGAGE COMPARTMENT LAMPS ARE INOPERATIVE 

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. H1 CHECK THE DECKLID RELEASE SOLENOID OPERATION 
    • Operate the decklid release solenoid.
    • Does the decklid release operate? 
    1. YES  : Go to  H2.
    2. NO  : REFER to HANDLES, LOCKS, LATCHES & ENTRY SYSTEMS article.
  2. H2 CHECK THE DECKLID AJAR PID STATUS WITH THE SCAN TOOL 
    • Key in ON position.
    • Open the decklid.
    • Enter the following diagnostic mode on the diagnostic tool: LCM DataLogger
    • Monitor the LCM luggage compartment lid ajar switch PID (DECKLID).
    • Does the decklid ajar PID match the decklid position? 
    1. YES  : Go to  H3.
    2. NO  : Go to  H7.
  3. H3 CHECK THE LUGGAGE LAMP OPERATION WITH THE SCAN TOOL 
    • Enter the following diagnostic mode on the diagnostic tool: LCM DataLogger
    • Select the LCM luggage compartment lamp (TRUNK_LMP) active command and command the luggage compartment lamps on.
    • Do the luggage compartment lamps illuminate? 
    1. YES  : Go to  H12.
    2. NO  : Go to  H4.
  4. H4 CHECK CIRCUIT 705 (LG/OG) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Luggage Compartment Lamp C4198 or C428
      • Fig 1: Checking Circuits For Open
      GF0019107Courtesy of FORD MOTOR CO.
    • Measure the voltage between the luggage compartment lamp C428-1, circuit 705 (LG/OG), and ground; or between the luggage compartment lamp C4198-1, circuit 705 (LG/OG), and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  H5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. H5 CHECK CIRCUIT 707 (WH/YE) FOR AN OPEN 
    • Disconnect: LCM C2145d
      • Fig 2: Checking Circuit For Open
      GF0014623Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LCM C2145d-9, circuit 707 (WH/YE), harness side and the luggage compartment lamp C4198-2 or C428-2, circuit 707 (WH/YE), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. H6 CHECK THE LUGGAGE COMPARTMENT LAMP OPERATION 
    • Connect: Luggage Compartment Lamp C4198 or C428
      • Fig 3: Connecting Fused Jumper Wire
      GF0014624Courtesy of FORD MOTOR CO.
    • Connect a fused (15A) jumper wire between the LCM C2145d-9, circuit 707 (WH/YE), harness side and ground.
    • Do the luggage lamps illuminate? 
    1. YES  : Go to  H12.
    2. NO  : INSTALL a new luggage lamp assembly for the one in question. TEST the system for normal operation.
  7. H7 CHECK THE LUGGAGE COMPARTMENT LID AJAR SWITCH 
    • Key in OFF position.
    • Disconnect: Luggage Compartment Lid Release Solenoid/Ajar Switch C430
      • Fig 4: Connecting Fused Jumper Wire
      GF0014625Courtesy of FORD MOTOR CO.
    • Connect a fused (15A) jumper wire between the luggage compartment lid ajar switch C430-1, circuit 486 (BN/WH), harness side and the luggage compartment lid ajar switch C430-3, circuit 57 (BK), harness side.
    • Do the luggage lamps illuminate? 
    1. YES  : INSTALL a new luggage compartment lid latch. REFER to HANDLES, LOCKS, LATCHES & ENTRY SYSTEMS article. TEST the system for normal operation.
    2. NO  : Go to  H8.
  8. H8 CHECK CIRCUIT 486 (BN/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Trunk Pull-Down Module C4197 (Power Striker) or LTM C4081a (Power Decklid)
      • Fig 5: Measuring Resistance
      GF0047689Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a power striker, measure the resistance between the luggage compartment lid ajar switch C430-1, circuit 486 (BN/WH), harness side and the trunk pull-down module C4197-3, circuit 486 (BN/WH), harness side.
      • Fig 6: Measuring Resistance
      GF0047690Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a power decklid, measure the resistance between the luggage compartment lid ajar switch C430-1, circuit 486 (BN/WH), harness side and the LTM C4081a-4, circuit 486 (BN/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H9.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  9. H9 CHECK THE TRUNK PULL-DOWN MODULE OR THE LTM 
      Fig 7: Connecting Fused Jumper Wire
      GF0019111Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a power striker, connect a fused (15A) jumper wire between the trunk pull-down module C4197-1, circuit 700 (WH/VT), harness side and ground.
      • Fig 8: Connecting Fused Jumper Wire
      GF0019112Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a power decklid, connect a fused (15A) jumper wire between the LTM C4081a-1, circuit 700 (WH/VT), harness side and ground.
    • Do the luggage lamps illuminate? 
    1. YES  : Go to  H11.
    2. NO  : Go to  H10.
  10. H10 CHECK CIRCUIT 700 (WH/VT) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: LCM C2145b
      • Fig 9: Checking Circuit For Open
      GF0019113Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a power striker, measure the resistance between the LCM C2145b-4, circuit 700 (WH/VT), harness side and the trunk pull-down module C4197-1, circuit 700 (WH/VT), harness side.
      • Fig 10: Checking Circuit For Open
      GF0019114Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a power decklid, measure the resistance between the LCM C2145b-4, circuit 700 (WH/VT), harness side and the LTM C4081a-1, circuit 700 (WH/VT), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H12.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  11. H11 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.
  12. H12 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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