Pinpoint Test H: The Luggage Compartment Lamp Is Inoperative

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

H1 CHECK THE DECKLID AJAR PID STATUS WITH THE DIAGNOSTIC TOOL
- Key in ON position.
- Open the decklid.
- Enter the following diagnostic mode on the diagnostic tool: LCM Decklid Ajar PID.
- Monitor the decklid ajar PID.
- Does the decklid ajar PID match the decklid position?
Yes : GO to H2.

No : GO to H6.
H2 CHECK THE LUGGAGE LAMP OPERATION WITH THE DIAGNOSTIC TOOL
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: LCM Activation PID.
- Activate the luggage compartment lamp with the diagnostic tool.
- Does the luggage compartment lamp illuminate?
Yes : GO to H9.

No : GO to H3.
H3 CHECK CIRCUIT 705 (LG/OG) FOR AN OPEN
- Disconnect: Luggage Compartment Lamp C4198.
- Measure the voltage between the luggage compartment lamp C4198-1, circuit 705 (LG/OG), harness side and ground.
- Is the voltage greater than 10 volts?
Yes : GO to H4.

No : REPAIR the circuit. TEST the system for normal operation.
H4 CHECK CIRCUIT 1092 (PK/OG) FOR AN OPEN
- Disconnect: LCM
- Measure the resistance between the LCM C2145d-9, circuit 1092 (PK/OG), harness side and the luggage compartment lamp C4198-2, circuit 1092 (PK/OG), harness side.
  
  Fig 1: Checking Circuit 1092 (PK/OG) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to H5.

No : REPAIR the circuit. TEST the system for normal operation.
H5 CHECK THE LUGGAGE LAMP OPERATION
- Connect: Luggage Compartment Lamp C4198.
- Connect a fused (15A) jumper wire between the LCM C2145d-9, circuit 1092 (PK/OG), harness side and ground.
  
  Fig 2: Connecting Fused Jumper Wire Between LCM C2145d-9 Circuit 1092 Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Does the luggage lamp illuminate?
Yes : GO to H9.

No : INSTALL a new luggage lamp assembly. TEST the system for normal operation.
H6 CHECK THE DECKLID RELEASE SOLENOID OPERATION
- Operate the decklid release solenoid.
- Does the decklid release operate?
Yes : GO to H7.

No : REFER to BODY CLOSURES to continue diagnosis of the decklid release system.
H7 CHECK THE LUGGAGE COMPARTMENT LID AJAR SWITCH
- Key in OFF position.
- Disconnect: Luggage Compartment Lid Release Solenoid/Ajar Switch C430.
- Connect a fused (15A) jumper wire between the luggage compartment lid ajar switch C430-C, circuit 486 (BN/WH), harness side and the luggage compartment lid ajar switch C430-B, circuit 57 (BK), harness side.
  
  Fig 3: Checking The Luggage Compartment Lid Ajar Switch
  Courtesy of FORD MOTOR CO.
- Does the luggage compartment lamp illuminate?
Yes : INSTALL a new luggage compartment lid release solenoid/ajar switch. REFER to BODY CLOSURES . TEST the system for normal operation.

No : REMOVE the jumper wire. GO to H8.
H8 CHECK CIRCUIT 486 (BN/WH) FOR AN OPEN
- Disconnect: LCM C2145B.
- Measure the resistance between the luggage compartment lid ajar switch C430-C, circuit 486 (BN/WH), harness side and the LCM 2145B-4, circuit 486 (BN/WH), harness side.
  
  Fig 4: Checking Circuit 486 (BN/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to H9.

No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
H9 CHECK FOR CORRECT LCM OPERATION
- Disconnect all the LCM connectors.
- Check for:
  - corrosion
  - 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?
Yes : INSTALL a new LCM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

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.