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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 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 Control

B2575 02

B2575 04

B2575 01

--

Right Headlamp Control

B2699 02

B2699 04

B2699 01

--

Circuit/System Description

When the headlight switch is placed in dipped beam position, the body control module (BCM) applies a voltage to the headlights 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 Lamps 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 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 Ω between the appropriate headlamp ground circuit harness connector listed below and ground.
    3. • 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.
    4. • 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.
    5. ⇒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 after completing the diagnostic procedure.

    •  Headlamp Replacement
    • Control Module References for BCM replacement, setup, and programming
   


© Copyright Chevrolet. All rights reserved
   


© Copyright Chevrolet. All rights reserved