Update moving backward definition

selfdrive/car/gm/carstate.py

@@ -33,7 +33,8 @@ class CarState(CarStateBase):
     self.cruise_buttons = pt_cp.vl["ASCMSteeringButton"]["ACCButtons"]
     self.buttons_counter = pt_cp.vl["ASCMSteeringButton"]["RollingCounter"]
     self.pscm_status = copy.copy(pt_cp.vl["PSCMStatus"])
-    self.moving_backward = (pt_cp.vl["EBCMWheelSpdRear"]["MovingBackward"] != 0) and not (pt_cp.vl["EBCMWheelSpdRear"]["MovingForward"] != 0)
+    # 0 - unknown, 1 - forward, 2 - reverse, 3 - unsupported, 4 - fault
+    self.moving_backward = (pt_cp.vl["EBCMWheelSpdRear"]["RLWheelDir"] != 2) and (pt_cp.vl["EBCMWheelSpdRear"]["RRWheelDir"] != 2)
 
     # Variables used for avoiding LKAS faults
     self.loopback_lka_steering_cmd_updated = len(loopback_cp.vl_all["ASCMLKASteeringCmd"]["RollingCounter"]) > 0