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 Key Switch CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Trunk Ajar Switch Signal | B2503 00 | B2503 00 | B2503 00 | -- |
Trunk Access Open Switch Signal | 1 | 1 | 1 | -- |
Trunk Release Relay Control | B3265 00 | B3265 00 | B3265 00 | -- |
Trunk Release Control | 1 | 1 | 1 | -- |
Rear Compartment Lid Latch Voltage Supply | 1 | 1 | 1 | -- |
Rear Compartment Lid Latch Ground | 1 | 1 | 1 | -- |
Trunk Release Relay Coil Ground | 1 | 1 | 1 | -- |
Headlamp Switch Ground | 1 | 1 | 1 | -- |
1. Trunk Release Inoperative | ||||
Circuit/System Description
When the external rear compartment lid release switch is activated, the trunk ajar switch signal circuit is switched to ground. When this input is received by body control module (BCM), the BCM applies voltage to the coil side of the TRUNK RELSE relay via the trunk release relay control circuit. The coil side of the trunk release relay is permanently grounded at G301. With the trunk release relay coil energized, the switch contacts close and provide battery voltage to the rear compartment lid latch assembly. This causes the rear compartment lid to release.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Condition for Setting the DTC
DTC B2503 00 will set when the BCM detects a short to voltage in the trunk ajar switch signal circuit.
Action Taken When the DTC Sets
Trunk release switch inputs will be inactive until the fault is no longer present and DTC B2503 is cleared.
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | You issue a scan tool CLEAR DTCs command. |
| • | A history DTC will clear once 40 consecutive malfunction free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Vehicle Access Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, observe the scan tool Int. Trunk/Liftglass Sw. status parameter while operating the internal trunk release switch. The reading should toggle between ACTIVE and INACTIVE.
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the rear compartment lid latch.
- Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal 3 and ground.
- Ignition ON, verify the scan tool Int. Trunk/Liftglass Sw. status parameter is INACTIVE.
- Install a 3A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 3. Verify the scan tool Int. Trunk/Liftglass Sw. status parameter is ACTIVE.
- If all circuits test normal, test or replace the rear compartment lid latch.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
