Conditions for Setting the DTC
WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
B370B 01
A short to voltage is detected in the rear wiper relay control circuit.
B370B 02
A short to ground is detected in the rear wiper relay control circuit.
B370B 04
An open or high resistance is detected in the rear wiper relay control circuit.