Pinpoint Test E: The Luggage Compartment Lamp Is Inoperative/Always On

Interior Lighting

Pinpoint Tests

Pinpoint Test E: The Luggage Compartment Lamp Is Inoperative/Always On

Refer to Wiring Diagram Set 89 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Interior Lamps for schematic and connector information. Diagrams By Number

Normal Operation

Power is supplied to the luggage compartment lamp from the demand lighting circuit. Ground for the luggage compartment lamp is controlled by the luggage compartment latch. When the luggage compartment lid is opened, a switch inside the latch closes and completes the path to ground.

- DTC B1331 (Decklid Ajar Rear Door Circuit Failure) - an on-demand DTC that sets when the SJB detects an open from the luggage compartment lid ajar input circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Luggage compartment lamp
- Luggage compartment lid latch



PINPOINT TEST E: THE LUGGAGE COMPARTMENT LAMP IS INOPERATIVE/ALWAYS ON

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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E1 DETERMINE IF THE LAMP IS INOPERATIVE OR ALWAYS ON


- Open the luggage compartment lid and observe the luggage compartment lamp.
- Is the luggage compartment lamp illuminated?

Yes
GO to E2.

No
GO to E3.

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E2 CHECK THE LUGGAGE COMPARTMENT LAMP GROUND CONTROLLED CIRCUIT FOR A SHORT TO GROUND


- Disconnect: Luggage Compartment Lid Latch C429 .
- Does the luggage compartment lamp continue to illuminate?

Yes
REPAIR circuit CLN13 (WH/BU) for a short to ground. TEST the system for normal operation.

No
INSTALL a new luggage compartment lid latch. REFER to Doors, Hood and Trunk &/or Locks. TEST the system for normal operation.

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E3 CHECK FOR VOLTAGE TO THE LUGGAGE COMPARTMENT LAMP


- Disconnect: Luggage Compartment Lamp C4198 .
- Ignition ON.
- Measure the voltage between the luggage compartment lamp C4198-1, circuit CLN09 (YE/GN), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to E4.

No
REPAIR circuit CLN09 (YE/GN) for an open. TEST the system for normal operation.

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E4 CHECK FOR VOLTAGE TO THE LUGGAGE COMPARTMENT LAMP USING THE CONNECTOR GROUND


- Measure the voltage between the luggage compartment lamp C4198-1, circuit CLN09 (YE/GN), harness side and the luggage compartment lamp C4198-2, circuit CLN13 (WH/BU), harness side.




- Is the voltage greater than 10 volts?

Yes
INSTALL a new luggage compartment lamp. TEST the system for normal operation.

No
GO to E5.

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E5 CHECK FOR VOLTAGE TO THE LUGGAGE COMPARTMENT LID LATCH


- Connect: Luggage Compartment Lamp C4198 .
- Disconnect: Luggage Compartment Lid Latch C429 .
- Measure the voltage between the luggage compartment lid latch C429-2, circuit CLN13 (WH/BU), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
INSTALL a new luggage compartment lid latch. REFER to Doors, Hood and Trunk &/or Locks. TEST the system for normal operation.

No
REPAIR circuit CLN13 (WH/BU) for an open. TEST the system for normal operation.

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