B2575
DTC B2575 or B2699
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 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/System Description
When the headlight switch is placed in low beam position, the body control module (BCM) applies a voltage to the head lamps through their respective voltage supply circuits.
Conditions for Running the DTC
B2575 01 and B2699 01
The headlamps are turned OFF.
B2575 02, B2575 04, B2699 02 and B2699 04
The headlamps are turned ON.
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 headlamp is inoperative.
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
Reference Information
Schematic Reference
Exterior Lights Schematics Exterior Lights Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left
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 appropriate Headlamp Low Beam test. The headlamps should be ON/OFF.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate headlamp.
2. Test for less than 5 ohms between the appropriate headlamp 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 headlamp 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 Left Headlamp Low Beam or Right Headlamp Low Beam test 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 headlamp.
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