B263A

DTC B263A

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 B263A 02

-
Exterior Illumination Lamp Circuit Short to Ground

Diagnostic Fault Information






Circuit/System Description

When the keyless entry control module receives a request from the keyless entry transmitter to unlock the doors, the keyless entry control module will send a serial data message to the BCM, the BCM will then command the left and right turn signal repeater lamps to illuminate.

Conditions for Running the DTC

When the BCM will commands the left and right turn signal repeater lamps to illuminate.

Conditions for Setting the DTC

B263A 02

The BCM detects a short to ground on the turn signal repeater lamp control circuit.

B263A 04

The BCM detects an open/high resistance on the turn signal repeater lamp control circuit.

Action Taken When the DTC Sets

The turn signal repeater 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 Programming and Relearning for scan tool information

Circuit/System Verification

Ignition ON, command the Outside Rear View Mirror Courtesy Lamp ON and OFF with a scan tool. The left and right turn signal repeater lamps should turn ON and OFF when changing between the commanded states.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate E4 turn signal repeater lamp.

2. Test for less than 30 ohms between the ground circuit terminal 2 and ground.

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

3. Connect a test lamp between the control circuit terminal 1 and ground.

4. Command the Outside Rear View Mirror Courtesy 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 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 circuit tests normal, replace the K9 BCM.

5. If all circuits test normal, test or replace the E4 turn signal repeater lamp.

Repair Instructions

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

* Front Side Door Courtesy Lamp Lens Replacement Front Side Door Courtesy Lamp Lens Replacement

* Control Module References Programming and Relearning for BCM replacement, programming and setup