B260C

DTC B260B or B260C

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 B260B 01
- Left Daytime Running Lamp Relay Control Circuit Short to Battery

DTC B260B 02
- Left Daytime Running Lamp Relay Control Circuit Short to Ground

DTC B260B 04
- Left Daytime Running Lamp Relay Control Circuit Open

DTC B260C 01
- Right Daytime Running Lamp Relay Control Circuit Short to Battery

DTC B260C 02
- Right Daytime Running Lamp Relay Control Circuit Short to Ground

DTC B260C 04
- Right Daytime Running Lamp Relay Control Circuit Open

Diagnostic Fault Information





Circuit/System Description

The body control module (BCM) receives a signal from the ambient light/sunload sensor indicating a low or high ambient outside light level. Under daylight conditions the BCM supplies a battery voltage to the daytime running lamps (DRL).

Conditions for Running the DTC

B260B 01 or B260C 01

Engine is not running.

B260B 02, B260C 02, B260B 04 or B260C 04
* The engine is running.
* Headlamp switch in AUTO position.
* The ambient light is day.

Conditions for Setting the DTC

B260B 01 or B260C 01

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

B260B 02 or B260C 02

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

B260B 04 or B260C 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 appropriate Dedicated Daytime Running Lamp test. The appropriate daytime running lamp should be ON/OFF.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate daytime running lamp.
2. Test for less than 5 ohm between the appropriate daytime running lamp ground circuit harness connector listed below and ground.

* E4C Daytime Running Lamp - Left ground circuit harness connector terminal G
* E4D Daytime Running Lamp - Right ground circuit harness connector terminal G

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

3. Connect a test lamp between the appropriate daytime running lamp control circuit harness connector listed below and ground.

* E4C Daytime Running Lamp - Left ground circuit harness connector terminal A
* E4D Daytime Running Lamp - Right ground circuit harness connector terminal A

4. Command the appropriate Dedicated Daytime Running Lamp 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 appropriate daytime running lamp.

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 headlamp control module replacement, setup, and programming