B2580

DTC B2580

CIRCUIT 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 switch signal circuit. The BCM then applies ground to the headlamp high beam relay control circuit which energizes the high beam relay, applying battery voltage to the high beam headlamps.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B2580 Headlamp High Beam Control Circuit




This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information. DTC Symptom Description

CONDITIONS FOR RUNNING THE DTC
Battery voltage must be between 9-16 volts.

CONDITIONS FOR SETTING THE DTC
- DTC B2580 01 will set when the BCM detects a short to battery voltage in the headlamp high beam relay control circuit.
- DTC B2580 06 will set when the BCM detects an open or short to ground in the headlamp high beam relay control circuit.

ACTION TAKEN WHEN THE DTC SETS
- When DTC B2580 01 is present, the high beam headlamps will not operate.
- When DTC B2580 06 is present, the high beam headlamps will remain ON.

CONDITIONS FOR CLEARING THE DTC
- The condition responsible for setting the DTC no longer exists.
- You issue a scan tool CLEAR DTCs command.
- A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

DIAGNOSTIC AIDS
Thoroughly inspect the wiring and connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis causing part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics

TEST

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