In this manual, a step to step procedure on how to replace a faulty door lock actuator mechanism on a MAZDA 3 FOR bk 2003-2010 will be discussed. However, before we dive deep into this manual procedure, let us check out some information on MAZDA 3 LOCK PROBLEMS.

NOTE* THE COMPLETE VERSION WITH IMAGES MUST BE DOWNLOADED TOP RIGHT.

What are the symptoms of a MAZDA 3 lock problem?

Mazda 3 door lock problem can be caused by several things such as a bad wiring circuit, bad relay and a bad door lock actuator.

 The symptoms of this is problem include:  

Mazda 3 central locking not working:

 Door lock and handle of the affected door not working properly:

Door not opening at all due to its actuator been stuck in the lock position.

Do I need a new MAZDA 3 lock actuator?

MAZDA 3 lock actuator could actually be the cause of your Mazda 3 central locking not working or other MAZDA 3 lock problem experienced with the vehicle, still, it is necessary to be certain if the door lock actuator is the real cause of the problem, since it won’t be nice getting a new door lock actuator and still experience the same problem.

To be certain you need a new MAZDA 3 lock actuator, a test by a technician needs to be performed on the vehicle, but since this is a DIY manual this information didn’t quite give the reply required the question.

To test if the MAZDA 3 lock actuator is the cause of the Mazda 3 central locking not working you will need a good light or a power probe tester, remove the door card, disconnect the connector socket going into the door lock actuator, if you are using a noid light look for a nice ground, then start touching inside of the connector with the noid light while pressing the lock and unlock button. Our objective is to see if we can get two point (depending on the vehicle model but usually a wht/blk and yelw/blk wires) in the connector where once the lock button is pressed the noid light illuminates at a point and won’t illuminate at the other point (turns to ground), while once the unlock button is pressed noid light illuminates at the other point and won’t illuminate at the first point (the first point turns to ground). If this was the scenario, it shows electric current find its way to the lock actuator motor but it won’t just function, this simply means you are having a MAZDA 3 lock problem resulting to Mazda 3 central locking not working due to the lock actuator.

How much does a Mazda 3 door lock actuator cost?

You can get the MAZDA 3 door lock actuator part or current price details on our website: https://partsfactoryaus.com.au/product/mazda-3-door-lock-actuator

Why pay a Technician when you can DIY (Do It Yourself)?  

Now, let us return back to how we can replace mazda 3 door lock actuator:

Aim/Objective: Replacing mazda 3 door lock actuator.  

List and Diagram of Tools Required:  Flat head screwdriver, Torx bit set, Phillips head screwdriver.  

Step to step procedure for replacing Mazda 3 door lock actuator.

Open up the door of the affected side to create space for the job about to be done

The best way to get started is by taking off the door card. To do this, follow Step 1.  

  Step 1:  

1. Ensure the window glass of the affected side is fully in the up
2. With a flat screwdriver, open up the tab on the inside of the door handle. Once this is done, the screw covered by the tab will be visible.
3. Unfasten the bolt inside the door handle.
4. Take off the handle cover
5. Unfasten the center screw beneath the door armrest. 
6. Put your finger at the bottom of the door card and pop it off
7. Remove the black/sail trim piece
8. Lift the cover up and unplug all three socket plugs connected to the card control switch behind the door card
9. Remove the door card completely out of the way

After the door card is removed the next step is to remove the door actuator mechanism. To do this, follow step 2.  

1. Peep through the larger hole at the front of the door
2. You will see two rods from the actuator mechanism connected to door handle
3. Put a flat screwdriver through the smaller hole, monitor the movement of the flat screwdriver through the little hole on the door
4. Flip open the clip holding the rods to the door handle
5. Pull off the rods from the door handle
6. Unfasten all the three Phillip head screws using a Philip head screwdriver (Note: if it’s difficult unfastening the Philip head screw, you might need to tap the screw using an impact driver and a hammer, then you should try unfastening it again)
7. Pop off the indoor handle lock/unlock cable from its space using a flat head screwdriver
8. Pop off the handle clip from its space using a flat head screwdriver
9. Pull out the cables from its space through the big hole
10. Pull out the door locking actuator a bit so you can have access to its electrical connector socket plug
11. Unplug the door locking actuator electrical connector socket plug from the actuator
12. Remove the door locking actuator through the big hole

The old faulty lock actuator mechanism had been removed successfully, It’s time to reinstall the new lock actuator mechanism. To do this, Follow Step 3  Step 3  

1. Swap the two rods on the old unit onto the new one
2. Move the new door locking actuator close to the big hole and plug back its electrical connector socket plug
3. Set the locking actuator to its position and fasten it a bit with one Philip set screw, so it can hold it in position.
4. Pass the door handle cable back through the door
5. Fit the cables back in their appropriate position (black on the top, the white on the bottom.
6. Put the handle back and fit the cables on it, then push down on the handle plug
7. Perform a quick test on the handle by locking and unlocking it.
8. Connect back the two rods on the lock actuator to the door handle through the big hole. Then lock back its clips
9. Untighten a bit the first Philip set screw used to keep the actuator in position a bit, fasten a bit the remaining two Philip set screw
10. After all Philip set screw are set, fasten properly all three screws.
11. Bring back the door card and reconnect all three socket plugs which should be connected to the card control switch
12. Fit back the black/sail trim piece  
13. Bring the door card back over the top of the window seal hanging it over and giving it a little snap to see if it lines up
14. Give it some snap around the edges till it pops into place
15. Put back the door handle cover by sliding it over and fasten back its screw
16. Fasten back the center screw beneath the door arm rest.

Precautions  

• Ensure using the right tools, to avoid blunting the fit surface of the screw  Ensure all bolts and screw are kept in a safe place to avoid misplacement 
• When unfastening bolts or screw ensure the tool is directly horizontal to the screw or bolt to be unfasten 
• Make sure you unlock all doors before testing the repaired door, to avoid been locked out in case of mistake during installation.
• Follow the steps listed in this manual accurately.