Just a few notes on removing the ECU and Loom from the Sharan whilst I remember the details... Someone is bound to ask so i figured i'll just post it here...
First thing... Inside the car, spend 10 minutes removing all the plastics from the dash, vents, radio, centre console, steering column shrouds. Everything. It'll make it loads easier.
The Sharan AFN ECU is located behind the clocks. To get access you need to remove the 2 screws holding the clock surround in place (at the top) and then remove the clocks themselves. A few screws and then tilt the entire clock assembly forward and draw it out. You should be able to get the plugs off the back.
You'll see the ECU attached to a steel plate behind the dashboard under some sound proofing carpet stuff.
First you need to disconnect the multiplug on the left. You do this by sliding the retaining clip all the way out and simply unplugging... except its not really that simple.
You should see a vaccum pipe connection to the ECU. Pull this off. This is the direction you need to slide the clip towards. However, there is a metal plate attached to the ECU with an anti tamper screw (torx with a pin in the centre) which you'll need to remove before you can slide the clip out.
You'll also need to disconnect the plugs from the immobiliser box which is mounted underneath the metal plate. theyre easy though, just squeeze and pull.
There are 3 nuts/bolts holding the plate to the car, 2 nearest the steering wheel which you can access from underneath, and one towards the front accessed from above. You may need a ratchet spanner for the front one as its a little tight.
Once loose, you just need to wiggle it around so its loose and guide it around all the "stuff" under there to freedom. Its a bit fiddly, and you may need to loosen the 2 bolts that hold the brace from the front of the dashboard towards the rear to make a bit more room, but its not impossible.
Loom... right. This is a pain....Disconnect everything in the engine bay. Everything.
Some stuff you can cut if you prefer... ABS wiring, lights etc. But all the engine stuff you'll need. And theres a lot of wire there.
Back inside...
Pull out the fuse box. There are 2 white plastic tabs that slide up/out, then lever the fuse box out from the bottom and lift it off the pegs. Unplug everything. At this point I discovered that part of the fuse box in my car had melted (heater blower fuse was a bit "special", and this is why!) so i chopped all the wires off that go to the fuses. Nothing there that cant be replicated in the T3 so I figured i was safe chopping them.
Likewise, all the wiring to the rear of the car down the drivers side. I just cut through them all.
There are then a load of wires that run to the passenger side of the car through the dashboard. I spent ages trying to check if any of this was needed but i couldnt find anything in there that I needed except the red/white 12v feed to the OBD port. So I chopped these too. I figure that the time I might have to spend adding a couple of wires at a later date wont be anywhere near the time it would take to remove all that side of the loom. You can chop the radio and heater control wiring off, there is a branch of the loom that goes to the airbag controller which you dont need, and the wiring down to the OBD port under the ashtray
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