Head unit install screwed remote locks, hlp.

I installed a Sony head unit into a 99 Civic. I used a harness adapter
to avoid any splicing. Once complete, the unit worked fine.

The unit beeps when you shut off the car to remind you to remove the
face plate. I soon noticed that if you do not remove the face plate, the
remote doorlock system will not unlock the doors anymore. It will lock
the doors, just not unlock. Also, when you trigger the remote, the face
plate alarm sounds each time. (So long as the face plate is on)

Anyone have any ideas here ?

 

Now, there is a challenge. Could you tell us a bit more about the
installation, like:

- What model head unit?
- Any amps installed, or are the speakers hooked up to the head unit?
- Do you have a motorized antenna?
- Did the harness adapter come complete, or did you have to splice two
parts together?
- How is the harness adapter wired? (text-drawing of connectors etc.,
see below).

I believe the factory plug looks something like this:

_______ _______________ ______
| |__| |__| |
| ___ ___ ___ ___ ___ ___ ___ ___ |
| |A| |B| |C| |D| |E| |F| |G| |H| |
| --- --- --- --- --- --- --- --- |
| ___ ___ ___ ___ ___ ___ ___ ___ |
| |I| |J| |K| |L| |M| |N| |O| |P| |
| --- --- --- --- --- --- --- --- |
|___________________________________|


One could speculate that if the head unit somehow feeds battery voltage
back onto the switched ignition wire, the keyless entry system would
refuse to unlock the doors (since the keyless entry receiver at that
point would believe the ignition was turned on). The remote amp turn-on
lead and / or the power antenna turn-on lead would be likely suspects
even though these lead should only be able to supply a very limited
current.

As for the remote triggering the face plate alarm, the head unit is
hooked up to your parking lights. When you use the remote, the parking
lights flash, and the head unit would "see" this.

Does the head unit always turn on when you turn on the ignition, or do
you sometimes have to turn it on manually? Does the head unit ever turn
off when you turn off your lights? Does the head unit back light etc.
work as it should when you turn the lights on and off?