SAAB WIS ONLINE

DTC B2580

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 Descriptor

DTC B2580 02

High Beam Control Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Headlamp High Beam Relay Control B2580 02 2 1 -
1. High Beam Lamps Always ON 2. High Beam Lamps Inoperative


Circuit/System Description

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

Conditions for Running the DTC

High beam lamps ON.

Conditions for Setting the DTC

The BCM detects a short to ground in the headlamp high beam relay control circuit.

Action Taken When the DTC Sets

The high beam headlamps will always be illuminated.

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 Testing


1. Ignition OFF, disconnect the X5 harness connector at the K9 BCM.

2. Ignition ON, test for B+ between the control circuit terminal 18 and ground.

3. If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X50A underhood fuse block.

4. If all circuits test normal, replace the K9 BCM.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Front Compartment Fuse Block Replacement

• Control Module References for BCM replacement, programming and setup