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DTC B2575 or B2699

DTC B2575 or B2699

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions has overviews of all diagnostic categories.


DTC Descriptors

DTC B2575 00

Left Headlamp Control Circuit Malfunction

DTC B2575 02

Left Headlamp Control Circuit Short to Ground

DTC B2575 04

Left Headlamp Control Circuit Open

DTC B2699 00

Right Headlamp Control Circuit Malfunction

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 Assembly Control

B2575 02

B2575 04

B2575 00

-

Right Headlamp Assembly Control

B2699 02

B2699 04

B2699 00

-



Circuit/System Description

When the headlight switch is placed in low beam position, the body control module (BCM) applies a voltage to the low beam headlamps (TT4) or daytime running lamps (DRL) lamps (TT2) through there respective voltage supply circuits.

The headlamp control module will monitor the DRL (TT2) circuits when the BCM applies the voltage to turn on the lamps. If the headlamp control module detects that the BCM commanded on the DRL (TT2), but the headlamp control module does not detect the DRL has illuminated, DTC B2575 or B2699 will set in the headlamp control module. This indicates there is a malfunction in the TT2 headlamp assembly, or an open bulb.

Conditions for Running the DTC

The headlamps are ON.

Conditions for Setting the DTC


• The BCM detects an over/undervoltage condition on the low beam headlamp control (TT4) or DRL control (TT2) circuits.

or

• The headlamp control module has detected a malfunction in the TT2 headlamp assembly or an open bulb.


Action Taken When the DTC Sets

The appropriate TT4 low beam headlamps or TT2 DRL 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

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 information on diagnostic tools

Circuit/System Verification

Ignition ON, change between the headlamp switch ON/OFF position. The low beam headlamps (TT4) or DRL (TT2) should be ON/OFF.

Circuit/System Testing


DTC B2575 or B2669 set in BCM (TT2 or TT4)

1. Ignition OFF, disconnect the harness connector at the appropriate headlamp.

2. Test for less than 5 Ω between the appropriate headlamp ground circuit harness connector listed below and ground.

• TT4 - E13L Headlamp Assembly - Left ground circuit harness connector terminal 7

• TT4 - E13R Headlamp Assembly - Right ground circuit harness connector terminal 7

• TT2 - E13L Headlamp Assembly - Left ground circuit harness connector terminal 1

• TT2 - E13R Headlamp Assembly - Right ground circuit harness connector terminal 1

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

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

• TT4 - E13L Headlamp Assembly - Left signal circuit harness connector terminal 3

• TT4 - E13R Headlamp Assembly - Right signal circuit harness connector terminal 3

• TT2 - E13L Headlamp Assembly - Left signal circuit harness connector terminal 9

• TT2 - E13R Headlamp Assembly - Right signal circuit harness connector terminal 9

5. Ignition ON, change between the headlamp switch ON/OFF position. The test lamp should turn ON and OFF when changing between the headlamp switch ON/OFF position.

6. 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.

7. 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.

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



DTC B2575 or B2699 set in Headlamp Control Module (TT2)

1. Ignition OFF, remove the appropriate headlamp assembly.

2. Inspect the headlamp low beam internal wiring for open, or shorts.

3. If an open or short is found, replace the headlamp assembly.

4. Remove and inspect the affected low beam bulb for an open.

5. If the low beam bulb is open, replace the bulb.

6. If the low beam wiring and bulbs are normal, replace the headlamp control module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Headlamp Replacement

• Headlamp Bulb Replacement (Xenon - Left Side) Headlamp Bulb Replacement (Xenon - Right Side) Headlamp Bulb Replacement (High Beam) Headlamp Bulb Replacement (Low Beam)

• Control Module References for headlamp control module or BCM replacement, setup, and programming