Ambient Light Control Module
Table of contents
B1390 MERCURY Possible Causes
- Faulty Ambient Light Control Module
- Ambient Light Control Module harness is open or shorted
- Ambient Light Control Module circuit poor electrical connection
- Faulty Body Control Module (BCM)
How do I fix code B1390 MERCURY?
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
- B1390:83 Ambient Light Control Module: Value of Signal Protection Calculation Incorrect
- B1390:87 Ambient Light Control Module: Missing Message
Cost of diagnosing the B1390 MERCURY code
The cost of diagnosing the B1390 MERCURY 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)
B1390 MERCURY Description
The Body Control Module (BCM) monitors the Ambient Light Control Module. The BCM sets the OBDII code when the Ambient Light Control Module is not to factory specifications.