• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Headlamp High Beam Relay Control | 2 | 1 | B2580 00 | -- |
1. Headlamps Inoperative - High Beams 2. Headlamps Always On - High Beams |
When the body control module (BCM) receives a ground signal from the multifunction high beam or flash to pass (FTP) switch commanding to illuminate the high beam headlamps, the BCM will energize the high beam relay by grounding the high beam relay control circuit.
The battery voltage must be between 9-16 volts.
The high beam headlamp relay control circuit is shorted to voltage.
The high beam headlamps will not operate or will remain always on.
• | This DTC will clear on current status after the condition for setting the fault is corrected. |
• | A history DTC will clear after 100 consecutive ignition cycles without a fault present. |
Headlights/Daytime Running Lights (DRL) Schematics
Exterior Lighting Systems Description and Operation
Control Module References for scan tool information
Ignition ON, command the High Beam ON with a scan tool. The High Beam Relay Command parameter should display On and the high beam headlamps should illuminate.
⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |