I have a 2008 Honda Civic EX. Today the power lock buttons do not lock or unlock the driver door (but the rest of the doors are locked/unlocked accordingly). In addition, the remote's lock/unlock button doesn't lock/unlock any door (the horn chirps when hitting the buttons so I know the signal is getting to the car).
The only thing I can think of is the door lock actuator for the driver's door. What I don't understand is how that would make the remote lock/unlock stop working for all of the doors. Could the lock actuator cause both issues, or is there another potential cause?
I want to make sure that I know what the cause is to avoid buying wrong parts chasing down the real cause.
Edit: Solution and Causes
The causes were the lock actuator, key battery, and my stupidity.
- The lock actuator was what was causing the intermittent failure for the power lock/unlock to not work and partially responsible for the remote not locking/unlocking.
- The key battery was also part of the cause as it was dying, and was why part of the time it wouldn't remote lock/unlock.
- My stupidity comes into play when I tried ruling out the remote battery. When I was testing the remote I had the door open and was sitting right inside, and it turns out Honda won't let the remote lock the doors when a door is open for some reason. This meant when the doors were unlocked, hitting the lock button did nothing, and hitting unlock also did nothing since it was already unlocked (although I could hear it try to unlock and so I thought they key was fine). Sitting inside the car also meant that the dying battery signal reached the car for the test, but wouldn't when standing at a distance when the doors were closed.
It was quite the adventure for me, but thankfully after replacing the lock actuator and key battery it is all working properly now.