2010 Cadillac Truck SRX FWD V6-3.0L Page 580

2010 Cadillac Truck SRX FWD V6-3.0L Page 580

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/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/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

* The 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.