• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Rear Compartment Lid Ajar Switch Signal | B1543 02 | 1 | 1 | -- |
Rear Compartment Lid Ajar Switch Ground | -- | 1 | 1 | -- |
1. Trunk Lid Release Malfunction |
The body control module (BCM) receives a discrete input from the rear compartment lid ajar switch signal circuit. When the rear compartment lid release actuator releases the rear compartment lid, the rear compartment lid ajar switch, which is internal to the rear compartment lid release actuator, is supplied with ground which causes the trunk ajar switch signal circuit to be pulled low. The BCM interprets this and communicates via serial data with the instrument panel cluster. When the trunk is open/ajar and the vehicle is in any gear other than Park, the driver information center will display TRUNK OPEN. If the trunk is still open and the vehicle speed is greater than 5 km/h (3 MPH) a chime will sound.
Battery voltage is between 9-16 V.
The BCM detects the rear compartment lid ajar signal circuit is shorted to ground or closed for more than 180 seconds.
The BCM ignores inputs from the rear compartment lid release switch.
• | The DTC will be current for as long as the fault is present. |
• | When the fault is no longer present, the DTC will be a history DTC. |
• | A history DTC will clear after 50 ignition cycles. |
Luggage Compartment Description and Operation
Control Module References for scan tool information
Ignition ON, observe the scan tool Rear Closure Ajar Switch parameter while opening and closing the trunk. The parameter should change between Inactive and Active.
⇒ | If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module (BCM). |
⇒ | If not the specified value, test the signal circuit terminal 4 for a short to voltage or and open/high resistance. If the circuit tests normal, replace the K9 Body Control Module (BCM). |
⇒ | If not the specified value, replace the M40 Rear Compartment Lid Latch. |
⇒ | If greater than the specified range, replace the M40 Rear Compartment Lid Latch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup and programming |