For 1990-2009 cars

### 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

• | 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

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.

• | Headlamp Replacement

• | Control Module References for BCM replacement, setup and programming