This low cost method works great and can be done on many cars.
Rear door lock actuator rx300 fix.
Clean and reconnect the actuator.
Diy bri shows you how to repair a door lock actuator without a complete replacement.
Attach the plastic door lock actuator back onto the assembly with two screws.
You should see the voltage polarity toggle with each switch activation.
Then use your test light or digital meter to check for power and ground at the connector when you operate the lock unlock switch.
Unplug the door lock actuator electrical connector.
Door lock systems operate the actuator by toggling positive negative voltage to the actuator.
Lexus rx300 door actuator replacement.