Rain Sensor Internal Malfunction
Table of contents
B370A CADILLAC Possible Causes
- Faulty Windshield Outside Moisture Sensor (Rain Sensor)
- Windshield Outside Moisture Sensor harness is open or shorted
- Windshield Outside Moisture Sensor circuit poor electrical connection
- Faulty Body Control Module (BCM)
How do I fix code B370A 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 B370A CADILLAC code
The cost of diagnosing the B370A 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)
B370A CADILLAC Description
B+ and ground is supplied at all times to the rain sensor. The rain sensor communicates with the Body Control Module (BCM) via serial data. When the ignition is in the ON or ACCESSORY position and the windshield wiper/washer switch is in the intermittent delay position, the BCM monitors the rain sensor to determine the rain build up on the windshield. As rain builds up on the windshield, the BCM will command the wipers to activate. The sensitivity of the wiper frequency is controlled by the intermittent delay of the windshield wiper/washer switch. As the sensitivity is increased, the BCM will command more frequent wiper activation based on rain build up on the windshield.
The system supports the rain sensor On/Off button. The AUTO switch is located on the turn signal/multifunction switch. Press the auto button to turn the rain sensor On/Off. When rain sensor is turned on and the rain sensor wipe sensitivity positions is adjusted by the front delay switch. The wipers can be adjusted for more or less sensitivity to moisture. When rain sensor turned off, the wipers operate as timed intermittent wipers and can be adjusted for more or less frequent wipes.
If the ignition is in ON/RUN and the front band is in one of the sensitivity settings when auto is turned on or off, a message may display indicating if rain sensor was turned on or off.
If the ignition is in ON/RUN and the front band is not in one of the sensitivity settings when auto is turned on, a message may display indicating that the wiper band must be in one of the sensitivity settings for rain sensor to operate.
The Diagnostic Trouble Code (DTC) sets when communication between the BCM and the rain sensor is interrupted, and an interruption in communication is a serial data fault.