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Pinpoint Test H: The Luggage Compartment Lamp Is Inoperative

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. 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 luggage compartment lamp is controlled by the lighting control module (LCM). The LCM receives a signal from the luggage compartment lid ajar switch through circuit 486 (BR/WT). When the luggage compartment lid is opened, the luggage compartment lid ajar switch closes and signals the LCM. The luggage lamp is supplied voltage through circuit 705 (LG/OG). The LCM controls the ground side of the luggage compartment lamp through circuit 1092 (PK/OG).

This pinpoint test is intended to diagnose the following:

PINPOINT TEST H: THE LUGGAGE COMPARTMENT LAMP IS INOPERATIVE 

  1. H1 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 decklid ajar PID (DECKLID).
    • Does the decklid ajar PID match the decklid position? 
    1. YES  : Go to  H2.
    2. NO  : Go to  H5.
  2. H2 CHECK CIRCUIT 705 (LG/OG) FOR AN OPEN 
    • Disconnect: Luggage Compartment Lamp C428
    • Measure the voltage between the luggage compartment lamp C428-1, circuit 705 (LG/OG), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  H3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  3. H3 CHECK CIRCUIT 1092 (PK/OG) FOR AN OPEN 
    • Disconnect: LCM C2145d
      • Fig 1: Checking Circuit For Open
      GF0014623Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LCM C2145d-9, circuit 1092 (PK/OG), harness side and the luggage compartment lamp C428-2, circuit 1092 (PK/OG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. H4 CHECK THE LUGGAGE LAMP OPERATION 
    • Connect: Luggage Compartment Lamp C428
      • Fig 2: Connecting Fused Jumper Wire
      GF0014624Courtesy of FORD MOTOR CO.
    • Connect a fused (5A) jumper wire between the LCM C2145d-9, circuit 1092 (PK/OG), harness side and ground.
    • Does the luggage lamp illuminate? 
    1. YES  : REMOVE the jumper wire. Go to  H8.
    2. NO  : REMOVE the jumper wire. INSTALL a new luggage lamp assembly. TEST the system for normal operation.
  5. H5 CHECK THE DECKLID RELEASE SOLENOID OPERATION 
    • Operate the decklid release solenoid.
    • Does the decklid release operate? 
    1. YES  : Go to  H6.
    2. NO  : REFER to HANDLES, LOCKS, LATCHES & ENTRY SYSTEMS article to continue diagnosis of the decklid release system.
  6. H6 CHECK THE LUGGAGE COMPARTMENT LID AJAR SWITCH 
    • Key in OFF position.
    • Disconnect: Luggage Compartment Lid Release Solenoid C430
      • Fig 3: Connecting Fused Jumper Wire
      GF0014625Courtesy of FORD MOTOR CO.
    • Connect a fused (5A) 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.
    • Does the luggage compartment lamp 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  : REMOVE the jumper wire. Go to  H7.
  7. H7 CHECK CIRCUIT 486 (BN/WH) FOR AN OPEN 
    • Disconnect: LCM C2145B
      • Fig 4: Checking Circuit For Open
      GF0014626Courtesy of FORD MOTOR CO.
    • Measure the resistance between the luggage compartment lid ajar switch C430-1, circuit 486 (BN/WH), harness side and the LCM 2145B-4, circuit 486 (BN/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H8.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  8. H8 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. TEST the system for normal operation.
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