Mechanics

POWER DOOR LOCKS

1993 Honda Civic

Interior problem
1993 Honda Civic 4 cyl Front Wheel Drive Automatic 69000 miles

I have read on your site where several people have had a problem with the power door locks stop working. Can you give me a direction on where to start to diagnose the problem or if you know the cause for me to start there. Is there a way to diagnoe the door lock control.
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Acrock
August 20, 2008.



Hi Acrock,

Before we are able to suggest what to do, we need to know your problem.

You should describe in details the symptoms etc.

KHLow2008
Aug 22, 2008.
The electic door locks just stopped working I used a v/o meter to check the seitch on the driver door and it show thwe seitch is working properly. Then I tried checking the door lock actuator on the driver side door there was only one position that the switch showed continuity. I don't know where to begin to check the door lock control unit that is in the driver door. It is a united technolgies unit. I got a unit out of a 92 civic but it is a mitsubishi unit and the electronics inside are completely different even though it uses the same plug for both units. I have even checked the fuse and it is fine.

Tiny
Acrock
Aug 22, 2008.
Hi Acrock,

Is there any power supply to control unit?

Did you test the actuators?


http://www.2carpros.com/forum/automotive_pictures/192750_Civic93CentralLock01a_1.jpg


KHLow2008
Aug 23, 2008.
I have tested the actuatorswitch in the driver door and it will show continuity when the switch is activated, As for power to the door lock control I haven't checked that yet. It is hard for me to tell from the diagram which wire is the power wire. It seems to me that if a door actuator was bad it would short out and blow the fuse

Tiny
Acrock
Aug 23, 2008.
Hi Acrock,

If it is shorted, it will, but if it is an open circuit, faulty actuators would not blow any fuses.


http://www.2carpros.com/forum/automotive_pictures/192750_Civic93CentralLock01b1_1.jpg


KHLow2008
Aug 23, 2008.
Thanks for the blow up of the control unit wiring it makes it alot easier to read. If one of the actuators is bad will it cause the rest not to work or only that door.

Tiny
Acrock
Aug 23, 2008.
Hi Acrock,

If the actuator is shorted to ground, it will affect the others, otherwise no.

At the # 1 or # 3 of Left Front Power Door lock switch, click it to ground and see if there is any activity from the main control unit, (clicking noise of relay).

If power supply from battery input is available and ground is sufficient, the control unit is faulty.

KHLow2008
Aug 23, 2008.