B2605

DTC B2605

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 B2605 01
- Right Daytime Running Lamps Control Circuit Short to Battery

DTC B2605 02
- Right Daytime Running Lamps Control Circuit Short to Ground

DTC B2605 04
- Right Daytime Running Lamps Control Circuit Open

Diagnostic Fault Information





Circuit/System Description

When the headlight switch is placed in low beam position, the body control module (BCM) applies a voltage to the dedicated daytime running lamps through their respective voltage supply circuits.

Conditions for Running the DTC

* The engine is running.
* Headlamp switch in AUTO position.
* The ambient light is day.

Conditions for Setting the DTC

B2605 01

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

B2605 02

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

B2605 04

The BCM detects an open control circuit.

Action Taken When the DTC Sets

The appropriate headlamp is inoperative.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

Reference Information
Schematic Reference

Headlights/Daytime Running Lights (DRL) Schematics (Headlights/Daytime Running Lights (DRL) Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Exterior Lighting Systems Description and Operation (Exterior Lighting Systems Description and Operation)
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, command the Right Dedicated Daytime Running Lamp test. The left daytime running lamp should be ON/OFF.

Circuit/System Testing

Note: If DTC B2605 04 is set, instrument panel fuse block fuse BCM 4 may also be open. Test circuit and fuse before BCM replacement.

1. Ignition OFF, disconnect the harness connector at the E4D Daytime Running Lamp - Right.
2. Test for less than 5 ohm between the E4D Daytime Running Lamp - Right ground circuit harness connector terminal G and ground.

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

3. Connect a test lamp between the E4D Daytime Running Lamp - Right ground circuit harness connector terminal A and ground.
4. Command the Right Dedicated Daytime Running 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 signal 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 signal circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 Body Control Module.

5. If all the circuits test normal, replace the E4D Daytime Running Lamp - Right.

Repair Instructions

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

* Headlamp Replacement (Headlamp Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup and programming