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DTC B2585 or B3867

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 Descriptors

DTC B2585 01: Sidelights Control Circuit Short to Battery

DTC B2585 02: Sidelights Control Circuit Short to Ground

DTC B2585 04: Sidelights Control Circuit Open

DTC B3867 01: Right Sidelight Control Circuit Short to Battery

DTC B3867 02: Right Sidelight Control Circuit Short to Ground

DTC B3867 04: Right Sidelight Control Circuit Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Sidelights Control

B2585 02

B2585 04

B2585 01

-

Right Sidelight Control

B3867 02

B3867 04

B3867 01

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Circuit/System Description

The body control module (BCM) energises the sidelights by applying voltage to the sidelight control circuit. When the sidelight control circuit is energised the sidelights are illuminated.

Conditions for Running the DTC

B2585 01

The sidelights are turned OFF.

B2585 02 or B2585 04

The sidelights are turned ON

B3867 01

    • The vehicle is OFF.
    • Headlamp switch in OFF or AUTO position.

B3867 02 or B3867 04

Headlamp switch in sidelight or dipped 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 sidelights are inoperative.

Conditions for Clearing the DTC

The condition for setting the DTC is not longer present.

Reference Information

Schematic Reference

Exterior Lamps Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

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

Vehicle in Service Mode, perform the appropriate Tail Lamp test. The appropriate sidelight should be ON/OFF

Circuit/System Testing

DTC B2585

  1. Vehicle OFF, disconnect the X2 harness connector at the K9 Body Control Module.
  2. Verify that a test lamp illuminates between the B+ circuit terminal 3 X2 and ground.
    3. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Connect the harness connector at the K9 Body Control Module and disconnect the harness connector at the appropriate inoperative tail lamp.
  4. Test for less than 5 Ω between the appropriate tail lamp ground circuit harness connector listed below and ground.
    5. • E4J Sidelight - Left Front harness connector terminal 1
    • E5AA Tail/Brake Lamp - Left harness connector terminal 3
    • E5E Tail Lamp - Left harness connector terminal 2
    ⇒If greater than the specified value, test the ground circuit for an open/high resistance.
  5. Connect a test lamp between the appropriate tail lamp control circuit harness connector listed below and ground.
    6. • E4J Sidelight - Left Front harness connector terminal 2
    • E5AA Tail/Brake Lamp - Left harness connector terminal 2
    • E5E Tail Lamp - Left harness connector terminal 1
  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.
    7. ⇒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.

DTC B3867

  1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module.
  2. Verify that a test lamp illuminates between the B+ circuit terminal 4 X1 and ground.
    3. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Connect the harness connector at the K9 Body Control Module and disconnect the harness connector at the appropriate inoperative tail lamp.
  4. Test for less than 5 Ω between the appropriate tail lamp ground circuit harness connector listed below and ground.
    5. • E4K Sidelight - Right Front harness connector terminal 1
    • E5AB Tail/Brake Lamp - Right harness connector terminal 3
    • E5F Tail Lamp - Right harness connector terminal 2
    ⇒If greater than the specified value, test the ground circuit for an open/high resistance.
  5. Connect a test lamp between the appropriate tail lamp control circuit harness connector listed below and ground.
    6. • E4K Sidelight - Right Front harness connector terminal 2
    • E5AB Tail/Brake Lamp - Right harness connector terminal 2
    • E5F Tail Lamp - Right harness connector terminal 1
  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.
    7. ⇒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 after completing the diagnostic procedure.

    •  Tail Lamp Replacement
    • Control Module References for BCM replacement, programming and setup
   


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