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Home >> Buick >> 2012 >> LaCrosse AWD V6-3.6L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B3867

B3867




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 Lamp Control Circuit Short to Battery

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

DTC B2585 04
- Left Park Lamp Control Circuit Open

DTC B3867 01
- Right Park Lamp Control Circuit Short to Battery

DTC B3867 02
- Right Park Lamp Control Circuit Short to Ground

DTC B3867 04
- Right Park Lamp Control Circuit Open

Diagnostic Fault Information






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 switched ON.

B3867 01, B3867 02 or B3867 04

Park lamps are switched ON.

B3867 02

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 side marker control circuit.

B2585 02 or B3867 02

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

B2585 04 or B3867 04

The BCM detects an open on the side marker control circuit.

Action Taken When the DTC Sets

B2585 01 or B3867 01

The appropriate side marker lamps will be continuously illuminated.

B2585 02, B3867 02, B2585 04 or B3867 04

The appropriate side marker lamps will be inoperative.

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

Exterior Lights Schematics Exterior Lights Schematics
Connector End View Reference

Component Connector End Views Connector End Views By Name
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 Verification

1. Ignition ON, observe the function of the E2LF side marker lamp-left front and the E2LR side marker lamp-left rear while commanding the Left Park Lamps ON and OFF with a scan tool. The E2LF side marker lamp-left front and the E2LR side marker lamp-left rear should turn ON and OFF while changing between the commanded states

• If the E2LF side marker lamp-left front and the E2LR side marker lamp-left are always ON or always OFF, refer to Left Side Marker Lamps Malfunction.

2. Ignition ON, observe the function of the E2RF side marker lamp-right front and the E2RR side marker lamp-right rear while commanding the Right Park Lamps ON and OFF with a scan tool. The E2RF side marker lamp-right front and the E2RR side marker lamp-right rear should turn ON and OFF while changing between the commanded states.

• If the E2RF side marker lamp-right front and the E2RR side marker lamp-right are always ON or always OFF, refer to Right Side Marker Lamps Malfunction.

Circuit/System Testing

Left Side Marker Lamps Malfunction
1. Ignition OFF, disconnect the X409 inline connector at the E5E tail lamp-left.
2. Disconnect the harness connector at the E2LF side marker lamp-left front.
3. Connect a test lamp between the control circuit terminal 1 and ground.
4. Ignition ON, command the Left Park Lamps ON and OFF 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 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 BCM.

5. Ignition OFF, connect the harness connector at the E2LF side marker lamp-left front.
6. Ignition ON, command the Left Park Lamps ON and OFF with a scan tool. The E2LF side marker lamp-left front should turn ON and OFF when changing between the commanded states.

• If the E2LF side marker lamp-left front is always OFF, replace the E2LF side marker lamp-left front.

7. If all the circuits test normal, replace the E5E tail lamp-left.

Right Side Marker Lamps Malfunction
1. Ignition OFF, disconnect the X410 inline connector at the E5F tail lamp-right.
2. Disconnect the harness connector at the E2RF side marker lamp-right front.
3. Connect a test lamp between the control circuit terminal 1 and ground.
4. Ignition ON, command the Right Park Lamps ON and OFF 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 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 BCM.

5. Ignition OFF, connect the harness connector at the E2RF side marker lamp-right front.
6. Ignition ON, command the Right Park Lamps ON and OFF with a scan tool. The E2RF side marker lamp-right front should turn ON and OFF when changing between the commanded states.

• If the E2RF side marker lamp-right front is always OFF, replace the E2RF side marker lamp-right front.

7. If all the circuits test normal, replace the E5E tail lamp-right.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Tail Lamp Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, setup and programming

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