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DTC B2580

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 B2580 01: Main Beam Control Circuit Short to Battery

DTC B2580 02: Main Beam Control Circuit Short to Ground

DTC B2580 04: Main Beam Control Circuit Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Main Beam Control

B2580 02

B2580 04

B2580 01

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Circuit/System Description

The headlamp main beam relay is supplied with battery voltage at all times. The indicator/multifunction switch signal circuit is grounded by pressing the indicator/multifunction switch. The body control module (BCM) energises the headlamp main beam relay by applying ground to the headlamp main beam relay control circuit. When the headlamp main beam relay is energised, the relay switch contacts close and battery voltage is applied through the main beam lamp fuses to the main beam lamp supply voltage circuit which illuminates the main beam lamps.

Conditions for Running the DTC

B2580 01, B2580 02 or B2580 04

Main beam lamps ON

Conditions for Setting the DTC

B2580 01

The BCM detects a short to voltage on the control circuit.

B2580 02

The BCM detects a short to ground on the control circuit.

B2580 04

The BCM detects an open control circuit.

Action Taken When the DTC Sets

The high beam lamps are 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, perform the Main Beam test. The high beam lamps should be ON/OFF when changing between the commanded states.

Circuit/System Testing
  1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
  2. Verify that a test lamp illuminates between terminal 58 X2 of the X50A Fuse Block - Underbonnet and ground.
    3. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace X50A Fuse Block - Underhood.
  3. Connect a test lamp between B+ and control circuit terminal 58 X2 of the X50A Fuse Block - Underbonnet.
  4. Command the main beam Lamps ON and OFF 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 control circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
    ⇒ If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Relay Replacement : Attached to Wire Harness
    • Control Module References for BCM replacement, setup, and programming
   


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