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B2585




DTC B2585 or B3867

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B2585 01
- Left Park Lamps Control Circuit Short to Battery

DTC B2585 02
- Left Park Lamps Control Circuit Short to Ground

DTC B2585 04
- Left 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/System Description

When the headlamp switch is placed in either the HEAD or PARK position, ground is applied to the park lamp signal circuit to the body control module (BCM). The BCM responds by applying voltage to the park lamps, tail lamps, and license lamps control circuits illuminating the park, tail, side marker, and license lamps.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.

* Park lamps ON.

Conditions for Setting the DTC

DTC B2585 01 and B2585 04

* The BCM detects a short to voltage or an open/high resistance in the left park lamps control circuit.

* The BCM detects a short to ground or an open/high resistance in the F16DA fuse B+ circuit.

DTC B2585 02

The BCM detects a short to ground in the left park lamps control circuit.

DTC B3867 01 and B3867 04

* The BCM detects a short to voltage or an open/high resistance in the right park lamps control circuit.

* The BCM detects a short to ground or an open/high resistance in the F6DA fuse B+ circuit.

DTC B3867 02

The BCM detects a short to ground in the right park lamps control circuit.

Actions Taken When the DTC Sets

DTC B2585 01

The left park lamps are always ON.

DTC B2585 02 and B2585 04

The left park lamps are always OFF.

DTC B3867 01

The right park lamps are always ON.

DTC B3867 02 and B3867 04

The right park lamps are always OFF.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

Exterior Lights Schematics Exterior Lights Schematics

Connector End View Reference

Component Connector End Views Sunshade - Left Front

Description and Operation

Exterior Lighting Systems Description and Operation Exterior Lighting Systems

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Testing

DTC B2585

1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module, ignition ON.

2. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF, disconnect the X2 harness connector at the X51A fuse block - instrument panel.

2. Test for less than 2 ohms in the B+ circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.

• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF, disconnect the X2 harness connector at the X51A fuse block - instrument panel.

2. Test for infinite resistance between the B+ circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K9 body control module.

• If the test lamp illuminates

3. Ignition OFF, connect the X2 harness connector at the K9 body control module.

4. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate left park lamp.

5. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground.

* E4N park/turn signal lamp - left terminal G

* E2LF side marker lamp - left front terminal B

* E5S tail/stop and turn signal lamp - left terminal G

* E5J tail lamp - left lower terminal B - GMC

* E5M tail lamp - left upper terminal B - GMC

* E2LR side marker lamp - left rear terminal B - Chevrolet

• If 5 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 5 ohms

6. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.

* E4N park/turn signal lamp - left terminal B

* E2LF side marker lamp - left front terminal A

* E5S tail/stop and turn signal lamp - left terminal B

* E5J tail lamp - left lower terminal A - GMC

* E5M tail lamp - left upper terminal A - GMC

* E2LR side marker lamp - left rear terminal A - Chevrolet

7. Verify the test lamp turns ON and OFF when commanding the Left Park Lamps ON and OFF with a scan tool.

• If the test lamp is always OFF

1. Ignition OFF, disconnect the X4 harness connector at the K9 body control module.

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K9 body control module.

• If the test lamp is always ON

1. Ignition OFF, disconnect the X4 harness connector at the K9 body control module, ignition ON.

2. Test for less than 1 V between the control circuit terminal and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K9 body control module.

• If the test lamp turns ON and OFF

8. Test or replace the appropriate left park lamp.

DTC B3867

1. Ignition OFF, disconnect the X1 harness connector at the K9 body control module, ignition ON.

2. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF, disconnect the X2 harness connector at the X51A fuse block - instrument panel.

2. Test for less than 2 ohms in the B+ circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.

• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF, disconnect the X2 harness connector at the X51A fuse block - instrument panel.

2. Test for infinite resistance between the B+ circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K9 body control module.

• If the test lamp illuminates

3. Ignition OFF, connect the X1 harness connector at the K9 body control module.

4. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate right park lamp.

5. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground.

* E4P park/turn signal lamp - right terminal G

* E2RF side marker lamp - right front terminal B

* E5T tail/stop and turn signal lamp - right terminal G

* E5K tail lamp - right lower terminal B - GMC

* E5N tail lamp - right upper terminal B - GMC

* E2RR side marker lamp - right rear terminal B - Chevrolet

• If 5 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 5 ohms

6. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.

* E4P park/turn signal lamp - right terminal B

* E2RF side marker lamp - right front terminal A

* E5T tail/stop and turn signal lamp - right terminal B

* E5K tail lamp - right lower terminal A - GMC

* E5N tail lamp - right upper terminal A - GMC

* E2RR side marker lamp - right rear terminal A - Chevrolet

7. Verify the test lamp turns ON and OFF when commanding the Right Park Lamps ON and OFF with a scan tool.

• If the test lamp is always OFF

1. Ignition OFF, disconnect the appropriate harness connector listed below at the K9 body control module.

* X4 - right front park lamps

* X5 - right rear park lamps

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K9 body control module.

• If the test lamp is always ON

1. Ignition OFF, disconnect the appropriate harness connector listed below at the K9 body control module, ignition ON.

* X4 - right front park lamps

* X5 - right rear park lamps

2. Test for less than 1 V between the control circuit terminal and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K9 body control module.

• If the test lamp turns ON and OFF

8. Test or replace the appropriate right park lamp.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Headlamp Replacement (Equinox) Headlamp Replacement (Equinox)Headlamp Replacement (Terrain) Headlamp Replacement (Terrain)

* Tail Lamp Replacement (Equinox) Tail Lamp Replacement (Equinox)Tail Lamp Replacement (Terrain) Tail Lamp Replacement (Terrain)

* Parking and Turn Signal Lamp Bulb Replacement (Terrain) Parking and Turn Signal Lamp Bulb Replacement (Terrain)Parking and Turn Signal Lamp Bulb Replacement (Equinox) Parking and Turn Signal Lamp Bulb Replacement (Equinox)

* Tail Lamp Bulb Replacement (Equinox) Tail Lamp Bulb Replacement (Equinox)Tail Lamp Bulb Replacement (Terrain) Tail Lamp Bulb Replacement (Terrain)

* Front Side Marker Lamp Bulb Replacement (Terrain) Front Side Marker Lamp Bulb Replacement (Terrain)Front Side Marker Lamp Bulb Replacement (Equinox) Front Side Marker Lamp Bulb Replacement (Equinox)

* Control Module References Control Module References for BCM replacement, programming, and setup

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