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DTC B2600 or B2605

DTC B2600 or B2605

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 Descriptor

DTC B2600 01

Left Daytime Running Lamps Control Circuit Short to Battery

DTC B2600 02

Left Daytime Running Lamps Control Circuit Short to Ground

DTC B2600 04

Left Daytime Running Lamps Control Circuit Open

DTC B2605 01

Right Daytime Running Lamps Control Circuit Short to Battery

DTC B2605 02

Right Daytime Running Lamps Control Circuit Short to Ground

DTC B2605 04

Right Daytime Running Lamps Control Circuit Open

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Left Daytime Running Lamps Control B2600 02 B2600 04 B2600 01 -
Right Daytime Running Lamps Control B2605 02 B2605 04 B2605 01 -


Circuit/System Description

When the headlight switch is in the Auto position and the ambient light sensor detects sunlight, the body control module (BCM) will command the daytime running lamps to illuminate by providing 12 volts to the daytime running lamp control circuit.

Conditions for Running the DTC


Engine is running.

Headlamp switch in AUTO position.

The ambient light is day.


Conditions for Setting the DTC

B2600 01 or B2605 01

The BCM detects a short to voltage on the daytime running lamp control circuit

B2600 02 or B2605 04

The BCM detects a short to ground on the daytime running lamp control circuit

B2600 04 or B2605 04

The BCM detects an open/high resistance on the daytime running lamp control circuit

Action Taken When the DTC Sets

B2600 01 or B2605 01

The daytime running lamp will be continuously illuminated.

B2600 02, B2600 04, B2605 02 or B2605 04

The daytime running lamp will be inoperative

Conditions for Clearing the DTC


The DTC will be current for as long as the fault is present.

When the fault is no longer present, the DTC will be a history DTC.

A history DTC will clear after 50 ignition cycles.


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 scan tool information

Circuit/System Verification

Ignition ON, command the Left Dedicated Daytime Running Lamp and the Right Dedicated Daytime Running Lamp ON and OFF with a scan tool. The E4C daytime running lamp - left and the E4D daytime running lamp - right should turn ON and OFF while changing between the commanded states.

Circuit/System Testing


1. Ignition OFF, disconnect the X1 harness connector K9 BCM.

2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.

3. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Ignition OFF, connect the X1 harness connector K9 BCM

5. Ignition OFF, disconnect the inline harness connector listed below:

E4C daytime running lamp - left X111 inline harness connector

E4D daytime running lamp - right X116 inline harness connector

6. Connect a test lamp between the control circuit terminal G and ground.

7. Command the appropriate Dedicated Daytime Running Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

8. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

9. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 BCM.

10. If all circuits test normal, replace the daytime running lamp bulb.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Daytime Running Lamp Bulb Replacement (TT6 Left Side)

Control Module References for BCM replacement, setup, and programming