B2580

DTC B2580

CIRCUIT DESCRIPTION
When the body control module (BCM) receives a ground signal from the headlamp dimmer switch high beam signal circuit or flash-to-pass switch signal circuit requesting to illuminate the high beam headlamps, the BCM will energize the high beam relay by grounding the headlamp 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.
- Headlamp switch is in the ON position.
- Headlamp high beam switch is cycled between high beams ON and OFF several times.

CONDITIONS FOR SETTING THE DTC
- When the BCM does not activate the high beam relay and the headlamp high beam relay control circuit is shorted to ground
- When the BCM activates the high beam relay and the headlamp high beam 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

Step 1 - Step 13:

Step 14: