The Bordeaux connector contains the following signals:

Speed pulse, for dead-reckoning
Reverse signal, for dead-reckoning
Switched 12V, to turn on nav (not vital)

So if the purple connector is not fitted, you will have no dead-reckoning. Nav will still switch on fine, it detects the power switch-on command on the ibus.

> There is no connection to the light module or the control is this required?

The LCM (light control module) connection is for the reverse signal, which is connected to the purple plug.

I do not know what you mean be "control" in the above sentence.

Picture goes from nav computer blue plug direct to the screen.
If you have TV fitted, picutre goes nav-TV_tuner-screen.

Things to check for if you have no pic:

1. Does screen backlight work? Look for a change in the screen hue when the power is turned on.

2. Is nav coded for a colour signal? Where did the nav come from? There is an E46 nav variant that does not produce the video, but this can be fixed with my NavCoder software. NavCoder will also read and advise you if the nav is a Mono (E46, no colour screen) or Colour nav (what you need)

3. Do you have TV fitted? If yo, disconnect nav blue plug, turn ign off, wait 10min, turn on again. TV tuner will take over generating the graphics. You may have to switch on and off a few times to get the TV tuner to do its job. This test simply proves the monitor and the connection to the monitor is OK.