Diagnostic Instructions
| • | 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. |
DTC Descriptor
DTC B2503 00: Trunk/Liftglass/Hatch Key Switch CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Rear Compartment Lid Ajar Switch Signal | B2503 00 | B2503 00 | B2503 00 | -- |
Rear Compartment Lid Latch Ground | -- | 1 | 1 | -- |
1. Trunk Release Malfunction | ||||
Circuit/System Description
The rear compartment lid ajar switch, which is internal the rear compartment lid release actuator, is supplied with ground which causes the trunk ajar switch signal circuit to be pulled low. The trunk ajar switch signal circuit is an input to the body control module (BCM). When the BCM receives a trunk ajar signal, a serial data message is sent to the driver information center (DIC) requesting the TRUNK OPEN message be displayed.
Conditions for Running the DTC
Battery voltage is between 9-16 volts.
Conditions for Setting the DTC
The BCM detects a fault in the rear compartment lid ajar switch signal circuit.
Action Taken When the DTC Sets
The TRUNK OPEN indicator will be not illuminate or continuously illuminate.
Conditions for Clearing the DTC
| • | 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. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Luggage Compartment Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Rear Closure Ajar Sw. parameter while opening and closing the trunk. The parameter should change between Inactive and Active.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the rear compartment lid latch.
- Ignition ON, verify the scan tool Rear Closure Ajar Sw. parameter is Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal C and ground. Verify the scan tool Rear Closure Ajar Sw. parameter is Active.
- If all circuits test normal, test or replace the rear compartment lid latch.
| ⇒ | If not the specified value, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If not the specified value, test the signal circuit terminal C for a short to voltage or and open/high resistance. If the circuit tests normal, replace the BCM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the rear compartment lid latch.
- Test for infinite resistance between the signal terminal C and the ground terminal B with the switch in the open position.
- Test for less than 2 ohms between the signal terminal C and the ground terminal B with the switch in the closed position.
| ⇒ | If not the specified value, replace the rear compartment lid latch. |
| ⇒ | If greater than the specified range, replace the rear compartment lid latch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
