Hi Group and Thread. I have a copy of the circuit diagram now ( actually a couple, all RHD but I think it will transpose OK ). First off, the fact that a large Toyota service centre told me (just over a year ago ) , to bring the car in next time the locking system was playing up , and they "MAY" be able to fix the fault , would infer that was no service bulletin related to the specific problem, and typically if the cause is not obvious they would just replace component for new until it was fixed. I have to assume that its NOT the Body ECU ( although possible ) that has the fault ,that’s too difficult to fix! Summary of my observations: Intermittent and likely to be related to humidity( ? low temp ). Key, Remote and door switch all have the same problem. There can be a delay for the 3 other locks which is not normal but will not generate warning. Because of the Delay in other locks I am going to assume that the driver’s door is the “master” My plan of investigation Make sure the drivers door lock motor is getting power. Check lock detection switch and associated wiring. I plan to emulate a closed or open circuit scenario.With a bit of luck I can emulate the problem :-) This signal is feed to the body ecu through a dedicated input ( other 3 doors have a common one ). This would mean its not involved in motor control just signal detection. I don’t think it’s the courtesy light switches as the door open light does not indicate a problem. trust the Body ECU Is it possible the common device used in the different models is the door lock/motor/switch.?? Stay watching this thread, Family only have one car,but I have some days off next month, to remove door panels etc B.
