Diagnostic Instructions

1. Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
2. Review Strategy Based Diagnosis for an overview of the diagnostic approach.
3. Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B2575 01: Headlamps Control Circuit Short to Battery

DTC B2575 02: Headlamps Control Circuit Short to Ground

DTC B2575 04: Headlamps Control Circuit Open

DTC B2699 01: Right Headlamp Control Circuit Short to Battery

DTC B2699 02: Right Headlamp Control Circuit Short to Ground

DTC B2699 04: Right Headlamp Control Circuit Open

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Left Headlamp Signal	B2575 02	B2575 04	B2575 01	--
Right Headlamp Signal	B2699 02	B2699 04	B2699 01	--

Circuit/System Description

When the headlight switch is placed in low beam position, the BCM applies a voltage to the head lamps through there respective voltage supply circuits.

Conditions for Running the DTC

B2575 01 and B2699 01

The appropriate turn signal is inactive.

B2575 02, B2575 04, B2699 02 and B2699 04

The appropriate turn signal is active.

Conditions for Setting the DTC

B2575 01 and B2699 01

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

B2575 02 and B2699 02

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

B2575 04 and B2699 04

The BCM detects an open control circuit.

Action Taken When the DTC Sets

The appropriate turn signal is inoperative.

Conditions for Clearing the DTC

The condition for setting the DTC is not longer present.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, command the body control module, perform the Low Beams test. The head lamps should be ON/OFF.

Circuit/System Testing

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

•	E13L Headlamp Assembly - Left ground circuit harness connector terminal 3

•	E13R Headlamp Assembly - Right ground circuit harness connector terminal 3

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

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

•	E13L Headlamp Assembly - Left signal circuit harness connector terminal 2

•	E13R Headlamp Assembly - Right signal circuit harness connector terminal 2

4. Command the appropriate turn signal 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 (BCM).

⇒	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 (BCM).

5. If all the circuits test normal, replace the appropriate headlamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.