Pinpoint Tests AE: The Trunk Ajar Message Center Warning Indicator Is Inoperative/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AE: The Trunk Ajar Message Center Warning Indicator Is Inoperative/Always On

Refer to Wiring Diagram Set 113, Luggage Compartment for schematic and connector information. Diagrams By Number

Normal Operation

The Instrument Panel Cluster (IPC) receives the trunk ajar status from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN) communication bus. The luggage compartment lid ajar switch (part of the luggage compartment lid latch) is hardwired to the SJB on vehicles without Intelligent Access (IA) and to the Remote Function Actuator (RFA) module on vehicles with IA. When the luggage compartment lid is ajar, the luggage compartment lid latch removes the ground to the luggage compartment lid ajar switch input. When the luggage compartment lid is closed, the luggage compartment lid release grounds the luggage compartment lid ajar switch.

On vehicles without IA, when the SJB detects an open on the luggage compartment lid ajar input circuit, the SJB sends a message to the IPC to turn on the trunk ajar message center warning indicator.

On vehicles with IA, when the RFA module detects an open on the luggage compartment lid ajar input circuit, the RFA module sends a message to the SJB to indicate that the luggage compartment lid is ajar. The SJB then relays the message to the IPC to turn on the trunk ajar message center warning indicator.

- DTC B1178:13 (Boot/Trunk Ajar Switch: Circuit Open) - an on-demand DTC that sets when the RFA module detects an open from the luggage compartment ajar input circuit to the RFA module.
- DTC B1331 (Decklid Ajar Rear Door Circuit Failure) - an on-demand DTC that sets when the SJB detects an open from the luggage compartment ajar input circuit to SJB.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Luggage compartment lid ajar switch (part of the luggage compartment lid latch)
- RFA module (with IA)
- SJB
- IPC

PINPOINT TEST AE: THE TRUNK AJAR MESSAGE CENTER WARNING INDICATOR 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.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

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AE1 CHECK THE MESSAGE CENTER WARNING INDICATOR FUNCTION

- Close all doors, hood and luggage compartment lid.
- Ignition ON.
- Open the driver door while monitoring the door ajar message center warning indicator.
- Does the driver door ajar message center warning indicator turn off with the driver door closed and turn on with the driver door open?

Yes
GO to AE2.

No
GO to Pinpoint Test AF. Pinpoint Tests AF: The Message Center Is Not Operating Correctly

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AE2 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Retrieve the recorded DTCs from the IPC self-test.
- Is DTC U0140:00 recorded?

Yes
GO to Pinpoint Test AW. Pinpoint Tests AW: DTC U0140:00

No
GO to AE3.

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AE3 CHECK THE LUGGAGE COMPARTMENT LID LATCH OPERATION

- Press the luggage compartment lid release switch.
- Does the luggage compartment lid release function operate?

Yes
For vehicles equipped with IA, GO to AE5.

For vehicles equipped without IA, GO to AE4.

No
REFER to Doors, Hood and Trunk &/or Locks.

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AE4 RETRIEVE THE RECORDED DTCs FROM THE RFA MODULE SELF-TEST

- Check for recorded DTCs from the RFA module self-test.
- Are any DTCs recorded?

Yes
For DTC B1178:13, GO to AE9.

For all other DTCs, REFER to the Diagnostic Trouble Code (DTC) Chart in Body Control Systems. Diagnostic Trouble Code (DTC) Chart

No
GO to AE6.

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AE5 RETRIEVE THE RECORDED DTCs FROM THE SJB SELF-TEST

- Check for recorded DTCs from the SJB self-test.
- Are any DTCs recorded?

Yes
For DTC B1331, GO to AE7.

For all other DTCs, REFER to the Diagnostic Trouble Code (DTC) Chart in Body Control Systems. Diagnostic Trouble Code (DTC) Chart

No
GO to AE6.

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AE6 CHECK THE LUGGAGE COMPARTMENT LID AJAR SWITCH

- Enter the following diagnostic mode on the scan tool: SJB (Without IA) or RFA Module (With IA) DataLogger.
- For vehicles without IA, select and monitor the SJB luggage compartment lid latch PID (DECKLID) with the luggage compartment lid open and closed.
- For vehicles with IA, select and monitor the RFA module luggage compartment lid latch PID (Trunk_Ajar_Sw) with the luggage compartment lid open and closed.
- Does the luggage compartment lid latch PID match the luggage compartment lid position?

Yes
For vehicles without IA, INSTALL a new SJB. REFER to Body Control Systems. TEST the system for normal operation.

For vehicles with IA, INSTALL a new RFA module. REFER to Body Control Systems. TEST the system for normal operation.

No
For vehicles without IA, GO to AE7.

For vehicles equipped with IA, GO to AE9.

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AE7 CHECK THE DECKLID AJAR INPUT CIRCUIT FOR A SHORT TO GROUND (WITHOUT IA)

- Ignition OFF.
- Disconnect: SJB C2280c.
- Measure the resistance between the SJB C2280c-16, circuit CPL58 (GY/OG), harness side and ground.

- Is the resistance greater than 10,000 ohms?

Yes
GO to AE8.

No
REPAIR circuit CPL58 (GY/OG) for a short to ground. CLEAR the DTCs. REPEAT the self-test.

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AE8 CHECK THE DECKLID AJAR INPUT CIRCUIT FOR AN OPEN (WITHOUT IA)

- Disconnect: Negative Battery Cable.
- Connect a fused jumper wire between the luggage compartment lid latch C4223-1, circuit CPL58 (GY/OG), harness side and ground.

- Measure the resistance between the SJB C2280c-16, circuit CPL58 (GY/OG), harness side and ground.

- Is the resistance less than 5 ohms?

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 CPL58 (GY/OG) for an open. TEST the system for normal operation.

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AE9 CHECK THE DECKLID AJAR INPUT CIRCUIT FOR A SHORT TO GROUND (WITH IA)

- Ignition OFF.
- Disconnect: RFA Module C2153e.
- Measure the resistance between the RFA module C2153e-22, circuit CPL58 (GY/OG), harness side and ground.

- Is the resistance greater than 10,000 ohms?

Yes
GO to AE10.

No
REPAIR circuit CPL58 (GY/OG) for a short to ground. CLEAR the DTCs. REPEAT the self-test.

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AE10 CHECK THE DECKLID AJAR INPUT CIRCUIT FOR AN OPEN (WITH IA)

- Disconnect: Negative Battery Cable.
- Connect a fused jumper wire between the luggage compartment lid latch C4223-1, circuit CPL58 (GY/OG), harness side and ground.

- Measure the resistance between the RFA module C2153e-22, circuit CPL58 (GY/OG), harness side and ground.