Conditions for Setting the DTC
WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
B320A 39, B320B 39, B320C 39
An internal malfunction or a momentary voltage spike has been detected by the DDM or PDM in the power window motor while commanding the window UP/DOWN.
B320A 42, B320B 42, B320C 42
A not normalized/programmed power window motor.
B320A 4B, B320B 4B, B320C 4B
The window motor experiences a loss of voltage in the B+ circuit or an open/high resistance in the serial data circuit.