Rear Wiper Function Control Circuit Short to Ground
Table of contents
B370B CADILLAC Possible Causes
- Faulty Rear Window Wiper Motor
- Rear Window Wiper Motor harness is open or shorted
- Rear Window Wiper Motor circuit poor electrical connection
- Faulty Body Control Module (BCM)
How do I fix code B370B 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 B370B CADILLAC code
The cost of diagnosing the B370B 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)
B370B CADILLAC Description
The Body Control Module (BCM) controls the rear wiper motor based on an input from the rear wiper switch, which is part of the turn signal/multifunction switch. The rear wiper switch uses a resistor ladder to determine low speed, intermittent, and rear washer operation. A constant B+ and ground are supplied to the rear wiper motor. When rear wiper operation is requested, the BCM sends serial data messages. When the rear wiper switch is placed in the low speed, intermittent, or rear washer position, the voltage is pulled down through a different resistor in the resistor ladder, reducing the voltage seen at the BCM. The BCM will respond by commanding the specific rear wiper function.
The BCM monitors the liftgate ajar signal circuit, and the BCM will disable the function of the rear wiper motor if the liftgate of liftglass is ajar or open.
The Diagnostic Trouble Code (DTC) sets when a short to voltage, short to ground or open or high resistance is detected in the rear wiper relay control circuit.