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Originally Posted by mccabema
**Update- Having studied the circuit diagram on page 15 of the retrofit guide I figure the following:
The violet connector on the nav computer connects to the black/white cable of PIN 8 of plug X11175 on the instrument cluster.
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X11175 pin 8 = TAA = speedo pulse (TAA = Tacho Anzeige). Your existing Mk2 will already have this cabled.
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Originally Posted by mccabema
This connector also carrys the reversing signal? There is another cable on this violet plug described as X229- Terminal R connector, I don't know what this is for !!?
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X1312 on the nav - violet connector - has the following 3 signals:
Pin 1 = RS = RuckfahrSignal = Reverse signal.
Pin 3 = R = TerminalR = +12V when ignition on
Pin 10 = TAA = TachoAnzeige = Speedo pulse signal
You existing Mk2 nav will have all of these signals in place on its violet connector, no need to touch anything.
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Originally Posted by mccabema
So I need not use the violet connector on the new retrofit harness, I can simply leave the original harness in place and use this in part alongside my new retrofit?
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Correct. You don't have to change what is existing and working!
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Originally Posted by mccabema
The white plug (X18802) at the monitor end, will connect to the nav computer via the blue socket (X1313) (You mention in a previous post that the blue connection on the nav computer goes to the blue plug on the display, from what I figure, the white goes to blue !! Am I wrong??).
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You are right. I was working from memory. Observing a unit here on my workbench:
Bordmonitor White = Video signal to LCD
Bordmonitor Blue = Tape/CD audio, power, ibus, illumination etc
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Originally Posted by mccabema
The blue plug (X18802) at the monitor end, will connect to the radio module via X13649 or Radio IV.
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No. X18802 on the on-board monitor (A196) carries the RGB video signals and power and ground for the LCD display. It connects directly to the blue plug X1313 on the nav computer (A112). **It is exactly this cable that you don't have**
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Originally Posted by mccabema
The black connector on the radio tuner (X18126) will stay as is.
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Correct, nothing changes for the radio module.
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Originally Posted by mccabema
Forgive me for asking this as I should have checked whilst I was digging around earlier, how does the cd changer (Also located in the rear) connect ? Is it on a seperate plug or do I need to add it to a connector?
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CD changer connects directly to radio module and to power & ibus. You do not need to touch it, it stays exactly the same and functionality will be identical.
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Originally Posted by mccabema
There are two wires running from the cd player connector (X13321) that cross into the radio module (X13649). There is also a cable (X13321) that connects from the cd changer to the radio module??
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This all stays as-is. You do not need to touch it. Nothing changes. what you have now is perfectly correct.
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Originally Posted by mccabema
And finally, the aerial stays connected to the radio module whilst the GPS coax that is currently going to the GPS module will connect the the GPS socket on the new MK4 computer.
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Correct. You do not need to touch the CD changer or radio module, they do not change.
the GPS antenna now plugs directly into the Mk3 or Mk4 nav. The old GPS receiver can be removed and discarded.
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Originally Posted by mccabema
The earth connection (X3279) will join the earth strap along with the existing harness?
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This is existing and does not need to be changed.
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Originally Posted by mccabema
The only other thing confusing me (As if theres not enough already !) is X3279, X1543 and X18344 which appear to go nowhere !
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X3279, X1543 = solder join in the loom
X18344 = loom connector
I recommend you do the following:
1. Remove and discard GPS receiver, and associated wiring loom. Some unwrapping may be required.
2. Obtain and fit connector X18802 + associated cabling back to nav computer. Remove the cabling and pins from the loom you obtain, and insert into the X1313 connector housing. All other nav signals are present, and remain required. Do not change them! This is the only cable loom you need to run from front of vehicle to back.
3. Obtain connector X18801. Remove the corresponding wires from your existing radio-nav headunit, and insert into appropriate pins in X18801. Fit PL wire from new loom. PL (LCD brightness control) will be the only missing wire.
Done!
Remember: 90% of what you need is already existing in your Mk2 mono nav. You only need to add the video signals.
Jochen