2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 666

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 666

Replacement (Chevrolet Tahoe Two-mode Hybrid))Headlamp Replacement (Tahoe, Avalanche) (See: Lighting and

Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Tahoe, Avalanche))Headlamp Replacement

(Escalade PLATINUM) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement

(Escalade Platinum))Headlamp Replacement (Non HID) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and

Replacement/Headlamp Replacement (Non HID))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming

B2580

DTC B2580

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* 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 B2580 00

- Headlamp High Beam Control Circuit

Diagnostic Fault Information

Circuit/System Description

When the turn signal/multifunction switch is placed in the headlamps high or flash to pass (FTP) position, ground is applied to the body control

module (BCM) through the headlamp high beam signal circuit or the flash to pass signal circuit. The BCM applies ground to the headlamp HIGH

BEAM relay control circuit which energizes the HIGH BEAM relay. With the HIGH BEAM relay energized, the switch contacts close allowing B+

to flow through the HI BEAM fuses to the high beam headlamps.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.

* Headlamps ON.

Conditions for Setting the DTC

The BCM detects a short to voltage in the headlamp HIGH BEAM relay control circuit.

Actions Taken When the DTC Sets