Chassis

On my RX 450h 2009 the liftgate has stopped working. Before it gave up I could reset it by disconnecting the battery but now it's dead, full time. Before I replace the motor/ECU I intend to check the remaining system so I have removed the unit to get access to the 26 pin connector, wire side. There are 12.7V on pin10 and pin12 and even on pin8 when ignition is on. So far so good. Anyone knows how the cooperation between latch motor and lift motor assy works? Guess that the lift motor ECU knows the state of the latch (apart from ability to operate it). How can I test the latch from the 26-pin? Next thing to test is the two sensors, left/right "POWER BACK DOOR SENSOR ASSEMBLY" in the diagram? Where are they in the car? What do the do? How can I test? In the diagram there is a "POWER BACK DOOR MAIN SWITCH". Is that the one in the glove box? Has anyone tried to power up the lift_motor/ECU assy on the bench in order to fault trace it? According to the diagram it might be possible to test it with the latch unit connected and simulate the two sensors, though there are two CAN lines (pin5 and pin6) that might have some influence. If I have to replace the lift motor/ECU assembly, can I just do so without any programming? Thanks in advance for all contributions😊 Per

Thank you all for an interesting thread!! The RX is such a rock solid car... obviously apart from the PBD... I have the same problem as many of you seems to have. The PBD won't open, or close or react in any other way regardless of method. I can lock/unlock all four doors from the tailgate handle but not operate the gate itself. I have disassembled enough, including opened up the head liner from behind to see the lift motor and from that, it looks like a limited project to replace it, if necessary. Can the old motor assembly somehow be saved? By resolder the PCB? Or by replace some component that commonly fails? Capacitors, for instance can be weak apoints in some designs. Guess that electronics are more prune to fail than the mechanic parts and both the lift motor and latch motor are affected And Herbie, if you still are in this thread, would you please send me your fix?