Service Information

Captiva

DTC B2585

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 B2585 00: Park Lamp Control Circuit

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Park Lamp Relay Control	B2585 00	B2585 00	B2585 00	--

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 headlamp switch park lamp 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 or by the BCM in low light conditions in AUTO mode.

Conditions for Setting the DTC

The BCM detects a short to ground, open, high resistance, or short to voltage on the park lamp relay control circuit.

Action Taken When the DTC Sets

All park lamps are inoperative.

Conditions for Clearing the DTC

•	The conditions for setting the DTC are no longer present.

•	A history DTC clears after 100 malfunction-free ignition cycles.

•	The BCM receives the clear code command from the scan tool.

Reference Information

Schematic Reference

Exterior Lamps Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, activate the Parking Lamp output control on the scan tool. The Park Lamp Relay Command parameter in the data list should display On and the park lamps should illuminate.

Circuit/System Testing

Ignition OFF, disconnect the underbonnet fuse block connector C5 and test for a short to voltage, short to ground, an open, or high resistance at the connector terminal C8.
With a scan tool, activate the Parking Lamp output control on the scan tool and test for a ground at the underbonnet fuse block connector C5 terminal C8.

⇒	If a ground signal is present, replace the underbonnet fuse block. If a ground signal is not present, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming