Headlamp High Beam Control Circuit
Table of contents
B2580 CADILLAC Possible Causes
- Faulty Headlamp High Beam Relay
- Headlamp High Beam Relay harness is open or shorted
- Headlamp High Beam Relay circuit poor electrical connection
- Faulty Body Control Module (BCM)
How do I fix code B2580 CADILLAC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- B2580 01 High Beam Control Circuit Short to Battery
- B2580 02 High Beam Control Circuit Short to Ground
- B2580 04 High Beam Control Circuit Open
Cost of diagnosing the B2580 CADILLAC code
The cost of diagnosing the B2580 CADILLAC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B2580 CADILLAC Description
The high beam and flash to pass functions are contained within the turn signal/multifunction switch. The Body Control Module (BCM) provides the turn signal/multifunction switch with two signal circuits, the high beam signal circuit and the flash to pass signal circuit. When the low beam headlamps are ON and the turn signal/multifunction switch is placed in the high beam position, ground is applied to the BCM through the high beam signal circuit. The BCM responds to the high beam request by applying ground to the high beam relay control circuit which energizes the high beam relay. With the high beam relay energized, the switch contacts close allowing battery voltage to flow through the high beam fuse to the high beam control circuits illuminating the high beam headlamps.