Park Lamps Request Circuit
Table of contents
B3802 CADILLAC Possible Causes
- Faulty Headlamp Switch
- Headlamp Switch harness is open or shorted
- Headlamp Switch circuit poor electrical connection
- Faulty Body Control Module (BCM)
How do I fix code B3802 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.
Cost of diagnosing the B3802 CADILLAC code
The cost of diagnosing the B3802 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)
B3802 CADILLAC Description
The Body Control Module (BCM) monitors the park lamp switch on signal circuit and the headlamp switch headlamps on signal circuit in order to determine when the park lamps and headlamps should be illuminated. When the headlamp switch is turned to PARK, the BCM senses that the park lamp switch signal on circuit is grounded and the headlamps switch headlamps ON signal circuit is open. The BCM will then energize the park lamp relay illuminating the park lamps. When the headlamp switch is turned to HEAD, the BCM senses that the park lamp switch on signal circuit and the headlamp switch headlamps ON signal circuit are grounded. The BCM will then energize the park lamp relay and headlamp low beam relay or high beam relay illuminating the park lamps and headlamps. The Diagnostic Trouble Code (DTC) sets when the headlamp switch park lamps ON signal circuit is open or has a high resistance.