Not necessarily. With canbus control there could be a permanent supply to the motor and the ECU sends a data signal to the motor to tell it what it should do. The motor control board will send a position signal back to the ECU and by talking to each other they decide the position that the motor should stop. Reversing the polarity will just fry the control board. It's the same with model railways. Used to be a case of just connect 12v one way and the train goes in one direction. Reverse the polarity and it goes the other way. Now with what's called DCC there's a permanent voltage to the track and you can control various trains at the same time, turn on/off loco lights, add sound etc.
So this is the wiring schematic for a RR Vogue steering column - in itself nothing spectacular, just two motors making it go up/down and in/out. Except, looks to me that each motor has a PL and effectively a single SL coming from off a digital controller (it links in with memorised seat positions). My question is, with only one SL to a motor, how do we reckon they're made to move in both rotations?? Because, I need to make one work manually as the switch/ECU is fried. Or, is it likely that there's actually an embedded controller within the motor that's just not drawn that is processing a digital signal? If the latter then I'm probably screwed.....
