Ambient Light Sensor Circuit
Table of contents
B2645 CADILLAC Possible Causes
- Faulty Ambient Light Sensor
- Ambient Light Sensor harness is open or shorted
- Ambient Light Sensor circuit poor electrical connection
- Faulty Body Control Module (BCM)
How do I fix code B2645 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 B2645 CADILLAC code
The cost of diagnosing the B2645 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)
B2645 CADILLAC Description
The Body Control Module (BCM) monitors the ambient light sensor signal circuit in order to determine if the Daytime Running Lights (DRL) or the Auto Headlights (ALC) should be turned ON in the AUTO mode. When the BCM senses the ambient light sensor signal voltage is between 1.75-4.9 volts, either the DRL will be commanded ON or the ALC will be commanded ON depending upon the amount of light received by the sensor.