How To Repair Front Door Lock Actuator

Door lock actuator: bug, testing, replacement

Updated: August 01, 2021

The electronic door lock actuator is the office that latches and locks/ unlocks the door in a machine with power locks. In most mod cars, the door lock actuator assembly includes a built-in latch mechanism, likewise as the switch (sensor) that monitors if the door is open or closed/locked. The door lock actuator is connected to the inner and outer door handles via cables or mechanical links.

Door lock actuator bug

There are several reasons why a door lock actuator may demand to be replaced:
The worn-out door lock actuator tin produce a buzzing noise during lock/unlock operation. A failed door lock actuator will crusade the door lock not to piece of work when all other door locks are working.

If the electric motor or the machinery inside the door lock actuator wears out, the door lock may lock or unlock slowly or piece of work sometimes, but not all the fourth dimension. In some cars, a failed door lock actuator may lock but won't unlock or the other mode effectually.

Ofttimes, the cablevision that connects the door lock actuator to the door handle may be built in into the actuator assembly. In this instance, if the cablevision breaks, the door lock actuator assembly may also demand to be replaced. See the photo of a broken door lock cablevision.

The problem with the congenital-in switch that monitors if the door is open or closed can cause the "Door Ajar" warning light to stay on fifty-fifty if the door is airtight. The aforementioned trouble tin can cause the anti-theft alarm to go off randomly. Sometimes information technology happens in rainy weather, when water penetrates into the door lock actuator and shorts the switch inside.

If the bolts that hold the door lock actuator come loose, information technology volition cause the door not to lock properly.

How the door lock actuator is tested

Checking the voltage at the door lock actuator connector

To diagnose, your mechanic may need to take the door cover off, check the door lock linkages and test the voltage at the door lock actuator, post-obit the wire diagram. The voltage is measured when the power lock button is pressed. If there is a voltage, but the actuator doesn't work, the door lock actuator is bad and needs to be replaced. If there is no voltage present when the power lock switch is operated, the problem must be traced further using the electrical diagram. It could be a master door lock switch, broken door wiring harness, bad connector, failed control module or only a blown fuse. Read too: how to check a fuse.

How tin y'all tell which door lock actuator causes the alert to get off?

If yous suspect that ane of the door lock actuators is causing the warning to get off in rainy weather, the first footstep is to bank check the weatherstrips above the door locks.

Gap in the weatherstrip Gap between the weatherstrip and the door mail service Lubricating door locks

Water can get within the door lock actuator if the weatherstrip right above it does non seal properly.

For case, in the photo (click to overstate) you can run across the gap in the weatherstrip which is the easiest way for water to get inside the door lock actuator beneath. One of our friends stock-still the random alarm that was going off in his car on rainy days by sealing these gaps in all the doors and lubricating the door locks and the trunk/tailgate locks.

Bank check if all the doors shut smoothly and the "Door Ajar" light turns off every time the door is airtight. If the light sometimes stays on and sometimes turns off when endmost ane of the doors, the switch in that door is the probable culprit. If any of the door locks look rusted, it'southward a expert idea to lube them with a proper liquid lubricant.

If no obvious fault is constitute, this problem can be diagnosed at your dealership. In some cars, the mechanic tin can see which door (or the trunk or the hood) has triggered the alert for the last several times using the dealership scan tool. If the scan tool shows that multiple alarms were triggered by the aforementioned door, the door lock connector and the actuator must be inspected. Oft, replacing the afflicted door lock actuator solves the trouble.

Door lock actuator replacement

Replacing a door lock actuator

Replacing a door lock actuator at a dealership may cost $fourscore-$180 labor plus $120-$270 function (OEM). Aftermarket parts are cheaper ($50-$120), but they are non available for all cars.

How easy is it to replace a door lock actuator equally a DIY project? We would rate information technology at vi on a scale from 1 to x, with 10 existence the almost hard. The door comprehend needs to be removed. The admission within the door is limited and you lot would need a pocket-size flashlight to see inside the door. In some cars, the window regulator together with the window or the outer door handle may also demand to be removed, which is often tricky. The well-nigh difficult function, though, is to properly connect all the cables and links after the new door lock actuator is installed.