I sent my 4runner in to have the clutch plate replaced a while ago and when I got it back I can't lock the doors (power locks) from the drivers side. The switch works to unlock the doors and the window switches work, only locking doesn't work. I can hear a click down by the relay panel under the dash when I press the switch to lock so I'm thinking it is probably a busted relay. Does anyone know some more about this issue and what part is needed to replace it? All I'm really seeing online are door lock control relay modules (something along those lines) so I'm guessing I can't just swap out a single relay. Here is a module I've found, does that look right? Judging by the plug on the bottom it looks like I can just swap it right out and plug in the new one.

 

bumping

 

Sound like classic $100 parts cannon.

Can you lock the doors from the passenger side? If so, then your problem is in the driver's side switch (or wiring), not the ECU. How about the door key?

You are correct that there are no single relays; the two spdt relays are in the ECU. http://web.archive.org/web/201106261.../8powerdoo.pdf

 

Get a wiring diagram for your vehicle and start testing.
Or throw new parts at it until the problem goes away or you run out of money.
I have seen plenty of issues with either door locks or power windows that turned out to be broken wires in the driver's door jamb and a very few that were related to relays or switches.
The least expensive way to fix anything is to diagnose, test, and prove the fault before buying anything.
If you just replace everything that someone guesses may be your issue you could get lucky or you could end up with tons of new stuff and still not be able to lock your doors.
Also, new parts have been known to be faulty... surprise... and you could end up adding to your issues and not knowing it until you break down and buy a meter and start going through the wiring diagram.