Pinpoint Test H: The Luggage Compartment Lamps Are Inoperative
Interior Lighting
Pinpoint Tests
Pinpoint Test H: The Luggage Compartment Lamps Are Inoperative
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 113, Luggage Compartment for schematic and connector information. Diagrams By Number
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 Liftgate/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:
- Wiring, terminals or connectors
- Luggage lamp assembly
- Trunk pull-down module
- Luggage compartment lid release solenoid/ajar switch
- LTM
- LCM
PINPOINT TEST H: THE LUGGAGE COMPARTMENT LAMPS ARE INOPERATIVE
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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H1 CHECK THE DECKLID RELEASE SOLENOID OPERATION
- Operate the decklid release solenoid.
- Does the decklid release operate?
Yes
GO to H2.
No
REFER to Locks.
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H2 CHECK THE DECKLID AJAR PID STATUS WITH THE SCAN TOOL
- Ignition ON.
- Open the decklid.
- Enter the following diagnostic mode on the scan tool: LCM DataLogger.
- Monitor the LCM luggage compartment lid ajar switch PID (DECKLID).
- Does the decklid ajar PID match the decklid position?
Yes
GO to H3.
No
GO to H7.
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H3 CHECK THE LUGGAGE LAMP OPERATION WITH THE SCAN TOOL
- Enter the following diagnostic mode on the scan 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?
Yes
GO to H12.
No
GO to H4.
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H4 CHECK CIRCUIT 705 (LG/OG) FOR AN OPEN
- Ignition OFF.
- Disconnect: Luggage Compartment Lamp C4198 or C428.
- 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?
Yes
GO to H5.
No
REPAIR the circuit. TEST the system for normal operation.
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H5 CHECK CIRCUIT 707 (WH/YE) FOR AN OPEN
- Disconnect: LCM C2145d.
- 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?
Yes
GO to H6.
No
REPAIR the circuit. TEST the system for normal operation.
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H6 CHECK THE LUGGAGE COMPARTMENT LAMP OPERATION
- Connect: Luggage Compartment Lamp C4198 or C428.
- Connect a fused jumper wire between the LCM C2145d-9, circuit 707 (WH/YE), harness side and ground.
- Do the luggage lamps illuminate?
Yes
GO to H12.
No
INSTALL a new luggage lamp assembly for the one in question. TEST the system for normal operation.
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H7 CHECK THE LUGGAGE COMPARTMENT LID AJAR SWITCH
- Ignition OFF.
- Disconnect: Luggage Compartment Lid Release Solenoid/Ajar Switch C430.
- Connect a fused 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?
Yes
INSTALL a new luggage compartment lid latch. TEST the system for normal operation.
No
GO to H8.
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H8 CHECK CIRCUIT 486 (BN/WH) FOR AN OPEN
- Disconnect: Trunk Pull-Down Module C4197 (Power Striker Only) or LTM C4081a (Power Decklid).
- For vehicles not 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 trunk pull-down module C4197-3, circuit 486 (BN/WH), harness side.
- 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?
Yes
GO to H9.
No
REPAIR the circuit. TEST the system for normal operation.
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H9 CHECK THE TRUNK PULL-DOWN MODULE OR THE LTM
- For vehicles not equipped with a power decklid, connect a fused jumper wire between the trunk pull-down module C4197-1, circuit 700 (WH/VT), harness side and ground.
- For vehicles equipped with a power decklid, connect a fused jumper wire between the LTM C4081a-1, circuit 700 (WH/VT), harness side and ground.
- Do the luggage lamps illuminate?
Yes
REMOVE the jumper wire. GO to H11.
No
REMOVE the jumper wire. GO to H10.
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H10 CHECK CIRCUIT 700 (WH/VT) FOR AN OPEN
- Disconnect: LCM C2145b.
- For vehicles not equipped with a power decklid, 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.
- 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?
Yes
GO to H12.
No
REPAIR the circuit. TEST the system for normal operation.
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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?
Yes
INSTALL a new trunk pull-down module or LTM. 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.
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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?
Yes
INSTALL a new LCM. 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.
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