Seat Ibiza 6J, 2.0 TDI FR, Auto Lights Retrofit (BCM 88D)

[MIH11MI6]

Excellent. Can you see the extra CAN lines from T73/54 and /57 to the instrument cluster in your wiring diagrams?

T73A 54/57 are occupied

T73B 54/57 are blank (see below)



This is a 7L6 Polo BCM, may be that I need to find a T5.1 BCM pinout

[iichel]

If you go for the 7E0 BCM, you need to look at the diagrams from a T6 for some specific things like high beam assist and these CAN lines.
I sent you the link to the T6 diagrams.

[MIH11MI6]

If you go for the 7E0 BCM, you need to look at the diagrams from a T6 for some specific things like high beam assist and these CAN lines.
I sent you the link to the T6 diagrams.

Thanks so much!

Just checked elsawin on a 2015 T6 and t73B 54/57 did have the CAN lines yeah



Checked T73A/37 and low and behold auto light was there. Which is great. Getting closer.

Do I need to do a full comparison against 7E0 T6 BCM aswell? Or do we have enough info now?

Cheers

[iichel]

I think it's fine to compare to Ibiza 7L6. It is not that different from t6 in many things.

[MIH11MI6]

I think it's fine to compare to Ibiza 7L6. It is not that different from t6 in many things.

Cool! Getting close then, any other feedback and ill start making the loom this evening, will start with the twisted pair for t73A 54/57

[ciclo]

I'll also take a look at Excel later, but I don't think I have anything to add to what iichel has already told you.

Please be precise with terminal crimp.

[MIH11MI6]

I'll also take a look at Excel later, but I don't think I have anything to add to what iichel has already told you.

Please be precise with terminal crimp.

Haha, I will try!

Any insight as to what's required BCM wise to get it working would be great.

Assuming most of the info is in this thread?

viewtopic.php?t=73130

[iichel]

Yes a lot of the BCM max treads are the same but different. The difference being down to the specific equipments of the cars. You'll recognize a lot of the thought processes there.

[MIH11MI6]

Yes a lot of the BCM max treads are the same but different. The difference being down to the specific equipments of the cars. You'll recognize a lot of the thought processes there.

Okay some progress has been made.

Twisted pair for CANbus to IC from bcm is in an open form, but ready to be tested.



I'm taking a lot of this from an old wiring loom I have, so little to no crimping required, but will need to apply anti rattle tape all round. Have some at the project car so not an issue.

I've stripped back the illumination switch wiring from old loom, its identical to the one documented in 7L6, so all I will need to do is run the T6F/3 to BCM Pin T73B/4 as iichel instructed.



I'm taking the full loom to the car just in case I missed any key differences.

Next step will be to make the wires for the T17 plug differences, as there are quite a few I will endeavour to combine them. I am still learning how to make looms so bare with me

Any pointers what to make after that would be great

[MIH11MI6]

Okay another update, I'm placing them all in here as a reference point so feel free to feedback.

I've got all the wires prepared for the differences in the T17 Auto Plug.

https://i.imgur.com/tLvxxzP.jpg

I followed the 7L6 Ibiza diagram, along with the spreadsheet. One thing I noted was that 3 different wires on the switch all end up feeding to T73a/45 (Side light input signal) and T37a/37



A particularly interesting part is that T17/13 and T17/16 both go to T73a/45. I have done this with a cable patch from pin 13 to pin 16.
I also bridged T17/12 and T17/16 as per the *2 suffix which is for "Only models with automatic driving lights control", which is what i'm after.

I have housed the wires in a spare T17 plug for now, so when I get to the car I know exactly where they need to go. Please excuse the cut wires, they will not be used
All connections made will also be heat shrunk and tessa taped.



note the spreadsheet, the only changes between are:

T17/9 - Rear fog, T73B/43
T17/12 - Auto Lights signal, T73a/37 (Also goes to T17/16 *)
T17/13 - side light switch input signal, T73a/45
T17/16 - also side light, T73a/45 (also goes to T17/12 *)

If anyone (iichel, ciclo) is able to validate this, that would be great. I won't tape the loom up until i know it all works anyway.

I noticed ciclo on your 90B retrofit document you implemented a relay, will I need this in my setup?

Thanks

[MIH11MI6]

Remember you also need to add two permanent positive wires to the BCM, to T73a/68 and T73b/63 from the fuse box
Also, you need to add a permanent positive wire to T73b/11 for the DRL/fog lights if you have any.

SC57 and SC58 extracted from old loom, however on cross reference I believe it is for T73a/63 and T73b/68



Getting closer!

[iichel]

Would suggest to take it step by step.
- Place the BCM Max, transfer coding, learn keys
- Install the a/63 and b/68 wires BUT have a critical look at the diagram
- Install the new CAN lines
- Install the new wires for light switch with auto setting
- Install all wires to exterior lights

If you take a look at the wires to a/63 and b/68, you'll see that they feed from the fuse box to the BCM.
The BCM outputs for low beam are wires from a/2 and b/2 directly to the lights.

Now the low beams are connected to SB39 and SB59 (at least in Polo 6R) in BCM 087 via the J331 low beam relay
Like this:

Code: Select all

+30 --- low beam relay --- SB39 --- headlight 1 T10/6
                       --- SB59 --- headlight 2 T10/6

+30 is a way of designating a wire as a constant positive, bosch terminal 30. +15 is an ignition live plus.

Now you can follow OEM wiring schemes but I'd suggest the way ciclo often does the BCM Max retrofit.
So bridge the J331 low beam relay. This way the output of the relay is now +30 that splits to SB39 and SB59.
Remove the outputs from SB39 and SB59. Connect these wires to a/63 and b/68. Now we have the +30 inputs sorted for the BCM.

The outputs of the BCM for low beam come from a/2 and b/2 and you can now lead them to SB39 and SB59. remember they were already there?
This way you don't have to mess around too much with the wiring.

Just an idea. If you choose to do it the OEM way, I'm perfectly fine with that as well, it's just a bit more work.

[MIH11MI6]

Would suggest to take it step by step.
- Place the BCM Max, transfer coding, learn keys
- Install the a/63 and b/68 wires BUT have a critical look at the diagram
- Install the new CAN lines
- Install the new wires for light switch with auto setting
- Install all wires to exterior lights

If you take a look at the wires to a/63 and b/68, you'll see that they feed from the fuse box to the BCM.
The BCM outputs for low beam are wires from a/2 and b/2 directly to the lights.

Now the low beams are connected to SB39 and SB59 (at least in Polo 6R) in BCM 087 via the J331 low beam relay
Like this:

Code: Select all

+30 --- low beam relay --- SB39 --- headlight 1 T10/6
                       --- SB59 --- headlight 2 T10/6

+30 is a way of designating a wire as a constant positive, bosch terminal 30. +15 is an ignition live plus.

Now you can follow OEM wiring schemes but I'd suggest the way ciclo often does the BCM Max retrofit.
So bridge the J331 low beam relay. This way the output of the relay is now +30 that splits to SB39 and SB59.
Remove the outputs from SB39 and SB59. Connect these wires to a/63 and b/68. Now we have the +30 inputs sorted for the BCM.

The outputs of the BCM for low beam come from a/2 and b/2 and you can now lead them to SB39 and SB59. remember they were already there?
This way you don't have to mess around too much with the wiring.

Just an idea. If you choose to do it the OEM way, I'm perfectly fine with that as well, it's just a bit more work.

Hi iichel, thanks for the advice!

I believe there are some differences between the 6J and 6R in respect to the low beam solution.

I can't see anywhere in my basic equipment diagram for a J331 Relay. Low beams come from fuses SC57 (15A) and SC58 (15A). See diagram below



wire 93 goes to RH headlight direct. T10/6
wire 75 goes to RH headlight direct. T10/6
wires 60 and 64 go directly from the light switch (T17/3 & T17/7 respectively)
wire 103 goes to T41/40, headlight dimmer switch (E4)

surely this would then mean, I could implement the replacement SC57/58 into t73a/63 and t73b/68, then the wires that were in their place (direct to headlights) would go to to T73a/b/2. I believe that completes the circuit?

Let me know what you think, I can send more diagram if need be

[iichel]

I think I got it.

According to the scheme...
Your car does not have a dipped beam relay but it is operated via the stalks. Look at where SC57+SC58 come from... 103... T41/40.
So if this is correct, this means your low beam goes OFF when you switch the high beam ON. Can you please verify? Both operation and picture of relay carrier?

Anyway, the same will probably still apply for the wires to the headlight (SC57+SC58).
The feed for the headlights to a/63 and b/68 should still be a +30 however. Now they are fed by 1x1,5mm2 on T41/38.
Do you have any places available in your fuse box for a +30 feed?

Otherwise a suggestion is to add a new wire to the battery fuse box; 2,5mm into 2x 1,5mm2 to a/63 and b/68.

[MIH11MI6]

I think I got it.

According to the scheme...
Your car does not have a dipped beam relay but it is operated via the stalks. Look at where SC57+SC58 come from... 103... T41/40.
So if this is correct, this means your low beam goes OFF when you switch the high beam ON. Can you please verify? Both operation and picture of relay carrier?

Anyway, the same will probably still apply for the wires to the headlight (SC57+SC58).
The feed for the headlights to a/63 and b/68 should still be a +30 however. Now they are fed by 1x1,5mm2 on T41/38.
Do you have any places available in your fuse box for a +30 feed?

Otherwise a suggestion is to add a new wire to the battery fuse box; 2,5mm into 2x 1,5mm2 to a/63 and b/68.

This is the circuit diagram for the dipper:



Excuse the images, its foggy this morning

https://i.imgur.com/HgX1zQR.jpg - Headlights on, dipped beam only

https://i.imgur.com/ukw5dP7.jpg - Headlights on, Full beam.

From my understanding the dipped beams do stay on, i know this because my dipped beam are bixenon (non OEM) which flick to full beam off the full beam bulb circuit inside the light.

I also checked the relay box, its really hard to get a clear picture but this is the best I got



These are the only three relays.

on Fuse SC57/58, I checked the wiring and as you can see below, there are two wires that feed off each, whether they are the correct feed or not I don't know, but i'll trace it back on the wiring diagram.



I have a suspicion the current SC57/58 feed is switched ignition, not permanent Live, so that may need to change, but I can use my old wiring loom to grab all that wiring.

I have loads of spots left on the fuse box for feeds if I need to