VolvoHordz;136194 wroteThe door lock actuators just have 2 wires and the polarity is reversed between unlocking and locking. Given it locks fine I doubt its a wiring issue. It is pretty common for the actuators to just get a bit gummed up.
Pull off the door trim, remove and strip down the actuator , clean it out and add new grease. Worked for me in the past.
Any tips for pulling off door trim? I've pulled off heaps in other model cars in the past but any tips for the 240? ?