On most newer cars there is a module or relay that controls the power door locks. I'm guessing this module is bad in your car since the syptoms moved from one door to another and then to 3 of the 4 doors. Since the wiring hasn't been changed at all and the problem moved around I'd say the wiring isn't a strong possibility. I don't know where the power door lock control module or relay is, but someone on here should be able to point you to its location. Once you find this module you can inspect it for proper operation.Yes, this is a 2003 Corolla CE which I bought off the lot in May of 2002.
When i attempt to lock the door either with the remote or with the door side button, three of the locks simply won't respond. The rear driver's side door will lock/unlock as it normally did when the car was new. Upon pushing the button, the doors make a "mechanical" sound, as if they are trying to lock but do not. The locks (or rather the button that actually moves) does not even budge.
I have had this problem for about a year. I have not attempted to wire anything myself, not have I had anyone attempt to do so. The wiring is the same as it was the day I bought it. I have had a dealership look at the door, and they told me it was likely a "hotspot" in a solenoid of any of the 4 doors. It would cost about 200 dollars for a part and then the labour to locate the bad part and replace it. It would likely be a 1000 dollar repair.
The strange thing is that it started off as only the passenger's side front door lock not working. Then it moved from there to the driver's side only. Then it would not lock any doors, and now the read side driver's door works. Bizarre. If i manually lock all of the doors, the remote will confirm if they are locked or not by flashing the lights of the car, but it will not engage or disengange 3 of the door locks.
Originally. when only the passenger's door lock would not work, slamming the door sometimes helped for a few days.
It is very frustrating - thanks for the help
My Haynes doesn't cover the latest generation and it's damn near impossible to find the EWD's online.
Sometime in the 90's Toyota switch from Single relays to Integration Relays. These magical voo-doo boxes have circuit-controller based relays. Damn expensive to buy, almost impossible to debug for us mere mortals.
In 2003 Model, PDL/Unlock are the BLUE/WHITE & BLUE wires (-12V) in driver's kick panel going into the white plug. Perhaps trace the wires to the integration relay?
My Haynes for 8th Gen shows them feeding into an Integration Relay. May be the same for 9th, maybe not.
Some IR's are behind the instrument cluster.
Here's the WD for 8th Gen ( may or may not be same/similar) :
Just out of curiousity, What are you trying to accomplish?
My auto door locks are on the fritz. See my previous post "2003 Corolla Door Selenoid"
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