B2585

DTC B2585

Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
- Strategy Based Diagnosis
- Diagnostic Procedure Instructions

DTC DESCRIPTORS

DTC B2585 00

Park Lamp Control Circuit - Domestic

DTC B2585 00
Left Park Lamp Control Circuit - Export

DIAGNOSTIC FAULT INFORMATION






IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

CIRCUIT/SYSTEM DESCRIPTION
Voltage is applied at all times to the Park Lamp Relay from battery voltage. When the headlamp switch is placed in the PARK position, ground is applied through the park lamp switch signal circuit to the body control module (BCM) . The BCM then applies a ground to the park lamp relay control circuit. This engages the relay and applies voltage through the park lamp fuses and to all the park lamps.

CONDITIONS FOR RUNNING THE DTC
The ignition is ON. The park lamps must be commanded on by the headlamp switch.

CONDITIONS FOR SETTING THE DTC
The BCM detect a short to voltage on the park lamp relay control circuit while trying to apply a ground to the circuit.

ACTION TAKEN WHEN THE DTC SETS
All park lamps are inoperative.

CONDITIONS FOR CLEARING THE DTC
The BCM clears this code from current when the fault is removed from the system.

Circuit/System Verification
Ignition ON, turn the park lamps on. The park lamps should illuminate.

Circuit/System Testing
1. Clear the DTC, ignition OFF, park lamp switch OFF, disconnect the (left) park lamp relay.
2. Verify a test lamp illuminates between the negative battery terminal and the park lamp relay control circuit.
- If the test lamp does not illuminate replace the park lamp relay.
3. Test for a short to voltage in the park lamp relay control circuit.
- If all circuits/connections test normal, replace the BCM.

Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center)
- Control Module References for BCM replacement, setup, and programming Programming and Relearning