All,

Nightmare installation this is.

Part 1
I took all the door cards off, therefore had to disconnect the switches etc, as I was upgrading the speakers and Headunit.

However, I have reconnected the switches, both rears and both fronts.
But now when I press lock or unlock on the remote fob, it simply opens the rear doors. The fronts do not open. I have to Manually open them and lock them with the key.

The electric folding mirrors have also stopped working (when I press the square button). The Window switches work.

Any Ideas?

Part 2
The headunit has 4 RCA outputs.
2 for Front (L + R) and 2 for Rear (L + R)

I have connected all of them successfully and they all work.
However as soon as i switch the ignition on, a massive whine comes out of the speakers.
But one 2 RCAs - so only 2 lots of speakers, either rear or front.

1. The whine was coming from the rear speakers, so i disconnected the rear RCAs (Going to the Amp) from rear RCA inputs (on H/U).
Whine Stopped.

2. I then took the front RCAs (Going to Amp) out the front RCA inputs (on H/U).
No sound at all, which i what I expected.

3. I then connected the front RCAs (Going to Amp) to the rear RCA inputs (on H/U).
No Whine. Which was confusing as I thought I may have made a mistake in the Rear Wiring.

4. I then connected the rear RCAs (Going to the Amp) to the front RCA inputs (on H/U).
Whine started again.

5. I then disconnected the rear RCAs (Going to the Amp) and the Whine Stopped.

So what I have concluded is, for some reason it doesnt like ALL 4 RCAs connected at one time when the ignition is ON.
However it is OK when the ignition is OFF.

I even tried a different RCA, but never made a differences.

For the H/U, the Ground I am using is the one for the Glove Box Torch.
The Positive is taken from the existing SatNav connectors.

I am totally lost on this one.

The only thing I have totally disconnected is the Wide Screen SatNav.
The DSP Amp, CD Changer and the Bluetooth receiver.