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 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 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
The park lamps are turned OFF.
B2585 02 or B2585 04
The park lamps are turned ON
B3867 01
* The ignition is turned OFF.
* Headlamp switch in OFF or AUTO position.
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.
Action Taken When the DTC Sets
The park lamps are inoperative.
Conditions for Clearing the DTC
The condition for setting the DTC is not longer present.
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 (Programming and Relearning)for scan tool information
Circuit/System Verification
Ignition ON, perform the appropriate Tail Lamp test. The appropriate park lamp should be ON/OFF.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate inoperative tail lamp.
2. Disconnect the negative terminal of the C1 Battery.
3. Test for less than 5 ohm between the appropriate tail lamp ground circuit harness connector listed below and ground.
* E5AA Tail/Brake Lamp - Left harness connector terminal 3
* E5AB Tail/Brake Lamp - Right harness connector terminal 3
• If greater than the specified value, test the ground circuit for an open/high resistance.
4. Reconnect the negative terminal to the C1 Battery.
5. Connect a test lamp between the appropriate tail lamp control circuit harness connector listed below and ground.
* E5AA Tail/Brake Lamp - Left harness connector terminal 2
* E5AB Tail/Brake Lamp - Right harness connector terminal 2
6. Command the appropriate Tail Lamp test 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 Body Control Module.
• 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.
7. If all the circuits test normal, replace the appropriate inoperative tail lamp.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Tail Lamp Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for BCM replacement, setup and programming