So, ladies and gents, a big update from me. Plans have changed a little bit with the Caravelle...
I had already bought a new BCM for this job (7H0 937 089F) with a view to just having auto headlights and stopping at that. Then, I had a minor incident involving a flat tyre and found other posts about direct TPMS, and decided I definitely needed that. Then found out about high beam assist too. So, another BCM from a T6 was purchased (7E0 937 090B)
Yesterday and today I've been carrying out a lot of wiring, and I did it in stages to allow troubleshooting at each step. I wired up a towing electrics kit (7F0 055 204B) and while I was in the area, added the wiring for the direct TPMS and made off the plug (I cannot yet find the correct receiver module, lots of 5Q0, no 3AA versions), and added the OEM second battery relay (2D0 951 253B) which receives a signal from BCM (via T73a/3) to couple the two batteries - all working OK.
I then carried out the conversion to BCM Max using the details in this thread, including re-wiring the lighting to work with the 10-pin switch. I did not run two feeds back to fuse SA2 in the ebox, instead I re-purposed some existing feeds, SC23 (formerly feed to the aux heater controls), and SB33 (formerly the feed to the radio) - both of these come from fuse SA2 and enter the fusebox as 2.5mm like the OEM installation. The things that were previously fed from SC23 and SB33 were then re-fed from my leisure battery so I don't have to worry about draining the main battery. Saved me some time running cables through the engine bay - and brought some benefits, everyone's a winner! Tested with the 7H0 937 089F BCM, and all working fine, not completely sure on the auto lights/dimmer function until it gets dark.
After this, I set to with swapping things over to allow the 7E0 BCM to be installed, a new pair of CAN wires were installed to the cluster, and the (new) dimmer wire installed in T73b/4. All tested and working fine again.
For some reason I didn't anticipate further lighting wiring being required for high beam assist, so this was a bit of a surprise yesterday afternoon. I am still using my old stalks (T5.1 ones without return spring) but thought I would do the wiring while I had the dash apart and see if it worked, loosely following
ciclo's drawing here cross referenced with ElsaWin drawings for the T5.1 - alas it did not completely work
The high beams were already independently fused, at SB6 for left, and SB28 for right, so I fed those from T73a/1 and T73b/1 respectively per ciclo's drawing, and carried out everything else pretty much per the drawing. I am currently able to 'flash' the high beams by pulling the stalk forward, but nothing happens when pushing it backwards with headlights on. Also, on 'Output Tests', when trying to activate 'High beam left' and 'High beam right', nothing happens and it states it is 'Inactive'. I could understand the stalk not working properly as it's not the right one for the job (yet), but I am struggling to get my head around why the output tests do not work. Apologies if this is the wrong place to post this query, I thought it may be relevant as it's related to BCM controlling lighting functions.
A current autoscan can be found
here, some of the errors are caused by the dashboard/passenger seat still being somewhat disassembled! Many of the coding alterations were based on guesswork as well.
A previous autoscan from before any wiring modifications were made (but dashboard/seat were disassembled)
here
Thanks in advance for any assistance/advice...
Edit to add: I have been outside now its dark, Auto lights function is working OK but no interior illumination (ie cluster backlight/buttons etc) is working when the switch is set to 'Auto' - works fine on other positions, tried another switch with same result. Also the dimmer does not have any effect either. It also seems the fog lights are not working any more either, both front and back
I forgot to check this earlier on today. I will try and verify my wiring connections tomorrow hopefully.