Diagnostic Instructions

1. Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
2. Review Strategy Based Diagnosis for an overview of the diagnostic approach.
3. Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B2585 01: Park Lamps Control Circuit Short to Battery

DTC B2585 02: Park Lamps Control Circuit Short to Ground

DTC B2585 04: Park Lamps Control Circuit Open

DTC B3867 01: Right Park Lamps Control Circuit Short to Battery

DTC B3867 02: Right Park Lamps Control Circuit Short to Ground

DTC B3867 04: Right Park Lamps Control Circuit Open

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Park Lamps Control	B2585 02	B2585 04	B2585 01	--
Right Park Lamps Control	B3867 02	B3867 04	B3867 01	--

Circuit/System Description

The body control module (BCM) energizes the park lamps by applying voltage to the park lamp control circuit. When the park lamp control circuit is energized the park lamps are illuminated.

Conditions for Running the DTC

B2585 01

Headlamp switch in OFF position.

B2585 02 or B2585 04

Park lamps are illuminated.

B3867 01

B3867 02 or B3867 04

Headlamp switch in park or low beam position.

Conditions for Setting the DTC

B2585 01 or B3867 01

The BCM detects a short to voltage on the control circuit.

B2585 02 or B3867 02

The BCM detects a short to ground on the control circuit.

B2585 04 or B3867 04

The BCM detects an open control circuit.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, perform the appropriate Taillamp Command test. The appropriate park lamp should be ON/OFF

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate park lamp.
2. Test for less than 5 Ω between the appropriate park lamp ground circuit harness connector listed below and ground.

•	E3LH Park Lamp ground circuit harness connector terminal 1

•	E3RH Park Lamp ground circuit harness connector terminal 1

⇒	If greater than the specified value, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the appropriate park lamp control circuit harness connector listed below and ground.

•	E3LH Park Lamp control circuit harness connector terminal 4

•	E3RH Park Lamp control circuit harness connector terminal 4

4. Command the appropriate Taillamp Command test with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module (BCM).

⇒	If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 Body Control Module (BCM).

5. If all the circuits test normal, replace the appropriate park lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.