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grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4786

Td5 Disco canbus.

This isn't as off topic as the title might suggest.

I've been given a Disco 2 instrument cluster and have been researching the wiring diagrams to see what would be involved to run them in a defender.

Luckily most of the functions are as per the defender (would have to run a disco 2 map to get the temperature gauge to function correctly)

However some of the functions are canbus controlled, well in fact just 3 of the ones you'd need for a defender.

That's the left and right direction indicator and the trailer indicator warning light. I haven't taken the cluster apart yet to see if it would be possible to drive the LEDs via resistors.

I think it would be awesome to use Arduino or similar to control the canbus functions as there is also a built in speaker which would allow for a light on warning chime etc.

So if anyone could shed some light on how I would go about finding the can protocol out and emulating it I would be very grateful

2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

14th Jan 2019 8:10am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17435

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

I'm sure someone who knows more will be along soon, but I have to say that i thought the only use of CanBus on a Disco 2 was for the communications between the engine ECU and the the auto transmission ECU, and the manual transmission D2 has no CanBus at all. I am very surprised indeed if any of the instrument pack was CanBus.

I understtod that this was the reason that the engine ECU is different between manual and auto versions - the auto version having the CanBus interface and the manual version not having it.

14th Jan 2019 10:03am

Jontd5

Member Since: 09 Dec 2018
Location: Laois
Posts: 39

99% sure there's no canbus in the D2 dash pack - should be handy enough get indicator warning lights sorted - if it's any help I can post a link for a D2 wiring diagram and connector layout - have them for a Td5 defender too if needed

14th Jan 2019 10:12am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4786

From the D2 electrical library,

Quote:
The BCU is connected using the serial data bus from pin C0661-1 on an SK wire, via header C0293 LHD/C0292 RHD, to the instrument pack pin
C0233-16.

14th Jan 2019 10:13am

Jontd5

Member Since: 09 Dec 2018
Location: Laois
Posts: 39

And yes there's a built in speaker on the back of the D2 instruments - tho the chimes might be bcu controlled - the D2 wiring system is actually very simple

14th Jan 2019 10:15am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4786

Thank you Jontd5 I have the defender layout diagram for the connectors but only the pin numbers for the D2 so that would be most useful

14th Jan 2019 10:16am

Jontd5

Member Since: 09 Dec 2018
Location: Laois
Posts: 39

https://drive.google.com/folderview?id=0B2...jN4LTVkdVU

That's all my D2 and defender stuff, the fusebox and bcu work together to control indicators in a D2 - there's no replaceable flasher unit - there is a two relays in the fuse box , one for left and other right.

What you are trying has been done before I think - so should be possible

14th Jan 2019 10:27am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17435

The Disco2 Electrical Library wrote:
The direction indicators and hazard warning lamp operation is controlled by the Body Control Unit (BCU), Intelligent Driver Module (IDM) and two electronic relays in the passenger compartment fusebox. The IDM and the relays are are an integral part of the passenger compartment fusebox and cannot be serviced individually.

[...]

The direction indicator circuit uses the serial data bus between the BCU, IDM and the instrument pack for flasher and hazard request and operation.

[...]

The BCU then sends a signal on an SK wire from pin C0661-1, via header C0293 LHD/C0292 RHD, to the IDM in the passenger compartment fusebox. The SK wire is the serial data bus between the BCU, IDM and the instrument pack. The signal is received by the IDM and interpreted as a request for LH or RH flasher operation. The IDM grants an earth path for the coil of the LH or RH direction indicator relay. The coil is energised by the feed from fuse 14 in the engine compartment fusebox, closing the relay contacts.

The control of these indicators is indeed a setrial bus, however I think it is a proprietary bus and not CanBus. Certainly the wiring on the vehicle does not conform to ISO 11898 (it is a single wire system rather than TP for starters) and I don't imagine that it is packet based.

I have never seen a spec for this interface and i suspect that the only way to find out how it works would be to stick a logic analyser on it and see. Then of course there's the problem of how to emulate the BCU/IDM end of it. It is probably easier, all things considered, to modify the instrument pack to work in a more defenderish (ie prehistoric) manner!

14th Jan 2019 10:28am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4786

Thanks Blackwolf,

Quote:
It is probably easier, all things considered, to modify the instrument pack to work in a more defenderish (ie prehistoric) manner!

This is what I thought, not really what I wanted to do but as you say. Probably the easiest route

14th Jan 2019 10:38am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4786

Jontd5 wrote:
https://drive.google.com/folderview?id=0B2cczYinyiWGWmQyTjN4LTVkdVU

That's all my D2 and defender stuff, the fusebox and bcu work together to control indicators in a D2 - there's no replaceable flasher unit - there is a two relays in the fuse box , one for left and other right.

What you are trying has been done before I think - so should be possible

Thanks Jon, I'll have a browse

14th Jan 2019 10:39am

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

grafty99 wrote:
From the D2 electrical library,

Quote:
The BCU is connected using the serial data bus from pin C0661-1 on an SK wire, via header C0293 LHD/C0292 RHD, to the instrument pack pin
C0233-16.

these are driven by body control unit

body control unit have to be match to ECM

14th Jan 2019 11:13am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4786

Decided to go for the KISS approach.

Cut the PCB tracks and soldered direct to the SMD LED.

Got the trailer indicator light working so far....

14th Jan 2019 3:11pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4786

All working, and switches 12v+ to suit the defender loom

Click image to enlarge 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

14th Jan 2019 3:41pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

glad you chose that approach.

14th Jan 2019 4:09pm

Co1

Member Since: 19 Aug 2018
Location: North Yorkshire
Posts: 3677

Innovative stuff! Looking forward to seeing it fitted.

14th Jan 2019 6:51pm

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