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 |
|---|---|---|---|---|
Rear Compartment Lid Ajar Switch Signal | B2503 00 | 1 | 1 | -- |
Rear Compartment Lid Latch Ground | 1 | 2 | 2 | -- |
1. Trunk Ajar Indicator Inoperative 2. Trunk Release Inoperative | ||||
Circuit/System Description
The body control module (BCM) monitors the trunk ajar switch circuit. The trunk ajar switch is normally open when the trunk is fully closed. When the trunk is open, the trunk ajar switch contact closes providing a path to ground. The BCM detects the drop in voltage and sends a signal to the driver information center (DIC) which displays the trunk ajar message.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Condition for Setting the DTC
When the BCM detects a short to ground in the trunk ajar switch signal circuit for longer than 10 minutes.
Action Taken When the DTC Sets
Trunk ajar lamp will be continuously illuminated.
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
Door Ajar Indicator 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 rear compartment lid. The parameter should change between Active and Inactive.
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the rear compartment lid latch.
- Ignition ON, verify the scan tool Rear Closure Ajar Sw. parameter is Inactive.
- Connect a 3A fused jumper wire between the signal circuit terminal 1 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 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. |
Component Testing
- Ignition OFF, disconnect the harness connector at the rear compartment lid latch.
- Test for infinite resistance between the signal terminal 1 and the ground terminal 3 in the open position.
- Test for less than 2 ohms between the signal terminal 1 and the ground terminal 3 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 |
