B2580
DTC B2580
Circuit Description
When the body control module (BCM) receives a ground signal from the headlamp dimmer switch high beam signal or flash to pass (FTP) switch signal commanding to illuminate the high beam headlamps, the BCM will energize the high beam relay by grounding the high beam relay control circuit.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2580 Headlamp High Beam Control Circuit
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
* When the BCM receives a high beam headlamp OFF command and the high beam headlamp relay control circuit is shorted to ground.
* When the BCM receives a high beam headlamp ON command and the high beam headlamp relay control circuit is shorted to voltage or open.
Action Taken When the DTC Sets
The high beam headlamps will not operate or will remain always on.
Conditions for Clearing the MIL/DTC
* 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.
* History and current DTCs can be cleared using a scan tool.
Test
