B2580
DTC B2580
CIRCUIT DESCRIPTION
The high beam relay is controlled by the body control module (BCM). The BCM provides ground to the high beam relay control circuit in order to turn ON the high beam relay. When the high beam relay control circuit opens, becomes shorted to voltage, or becomes shorted to ground without being commanded ON by the BCM, DTC B2580 is set.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B2580 Headlamp High Beam Control Circuit
CONDITIONS FOR RUNNING THE DTC
The ignition switch is in the ON position.
CONDITIONS FOR SETTING THE DTC
B2580 01
Will set if there is a short to voltage in the high beam relay control circuit
B2580 06
Will set if there is an open or short to ground in the high beam relay control circuit
ACTION TAKEN WHEN THE DTC SETS
- DTC B2580 is stored in the BCM memory.
- If the high beam relay control circuit is shorted to ground, the high beams are always ON.
- If the high beam relay control circuit is open, the high beam lamps are inoperative.
CONDITIONS FOR CLEARING THE DTC
- The conditions for setting the DTC are no longer present.
- A history DTC clears after 100 malfunction-free ignition cycles.
- The BCM receives the clear code command from the scan tool.
DIAGNOSTIC AIDS
- The high beam lamps will only illuminate under the following conditions:
- The headlamps are ON.
- The headlamp dimmer switch is in the high position.
- If the DTC is a history DTC, the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
TEST
