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DTC B2580

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.

B2580 01, B2580 02 or B2580 04

High beam lamps ON.

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.

The high beam lamps are inoperative.

The condition for setting the DTC is no longer present.

Schematic Reference

Headlamps/Daytime Running Lamps (DRL) Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

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

1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
2. Connect a test lamp between B+ and control circuit terminal 58 X2 of the X50A Fuse Block - Underbonnet.
3. 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.

⇒	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.

4. If all circuits test normal, replace the X50A Fuse Block - Underhood.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.