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 | -- | 2 | 2 | -- |
1. Trunk Ajar Indicator Inoperative 2. Trunk Release Inoperative | ||||
Circuit/System Description
The body control module (BCM) uses the rear compartment lid latch to determine the position of the trunk lid. When the trunk lid is open or ajar, the rear compartment lid ajar switch is closed, providing a ground path for the trunk ajar switch signal circuit. When the BCM detects that the trunk lid is open or ajar, a serial data message is sent to the driver information center (DIC) requesting the Trunk Open message be displayed.
Conditions for Running the DTC
The system voltage is 9-16 volts.
Condition for Setting the DTC
When the BCM detects a short to voltage in the trunk ajar switch signal circuit.
Action Taken When the DTC Sets
The Trunk Open indicator will constantly illuminate on the DIC or will not illuminate when the rear compartment lid is open or ajar.
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 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 between the signal circuit terminal 1 and the ground circuit terminal 3. 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 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 1 and the ground terminal 3 with the switch in the open position.
- Test for less than 2.0 ohms between the signal terminal 1 and the ground terminal 3 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 |
