R11S and Can Bus

[moze229]

Does the 2004 R1100S models have the CanBus system? I think not, but I'm really confused on this whole thing. I'm going to be installing a horn upgrade, and I don't want to change anything to the point where I get stored error codes. I want to wire it so that everything reads normal. I know how I'm going to wire it with relays, fuses, etc.

I found a picture of this part (BMW part # 83300402344) on another board that is the female horn connector to eliminate the need for cutting off the connector.



If I do have the CanBus system, will this eliminate the problem? I just don't understand the whole CanBus thing. Thanks for any suggestions.

Matt

[jduke]

No CANBUS. Friends that have gone to a louder horn used a relay and a direct connection to an aux. fusebox. Horn will get a cars attention.

[Boybiker3]

I got true dual air horns (with a compressor) into my front space. What a treat. Really nice to give them a loud toot when cars start pushing into your lane. Air horns being highly directional, are double-loud forwards and half-loud towards the rider - a nice feature.

Sorry, no write-up at my website. The oil cooler keeps the bugs out of the horns while not impairing horn sound much.

I suppose you could add a horn relay although mine seems to have one already. On another bike, I ran air horns for years without a relay.

If your clock is out, don't try to honk your horn (AKA fuse 3 for the horn relay but the big power from elsewhere).

Had Grandchild #6 yesterday. Nice. 3 boys and 3 girls.

[moze229]

Originally Posted by jduke

No CANBUS. Friends that have gone to a louder horn used a relay and a direct connection to an aux. fusebox. Horn will get a cars attention.

Yeah, I'm going to run from the OEM connector through a relay and power the whole thing straight from the battery with an inline fuse. Seems pretty straightforward. I just remember reading some posts before where people had done this and had to worry about codes coming up.

Isn't the OEM horn already on some sort of relay?

Matt

[throttlemeister]

Originally Posted by jduke

No CANBUS. Friends that have gone to a louder horn used a relay and a direct connection to an aux. fusebox. Horn will get a cars attention.

NOT correct! The R11S with servo assisted integral ABS DO have canbus. That basically means every R11S from 2002 onwards with ABS has canbus. Models before that, or those without ABS do not have canbus.

[moze229]

Originally Posted by throttlemeister

NOT correct! The R11S with servo assisted integral ABS DO have canbus. That basically means every R11S from 2002 onwards with ABS has canbus. Models before that, or those without ABS do not have canbus.

So ABS means CanBus. Ok. I think I'm clear on it now I do have the servo-assisted ABS.

I've heard a back-and-forth a few times reading other threads hence the reason for me posting the question. There doesn't seem to be a consistent agreement among people which bikes do, and which bikes do not have CanBus. BMW doesn't seem to be very forthcoming on this type of information either.

So now that I have CanBus, is wiring the horn the way I plan to going to hurt anything? Power from battery to relay/relay to switch/ground to frame? How can I hook this up so that I know I will not cause a problem with the system? Or should I just continue riding around relying on my moped horn and forget about it?

Matt

[Guest24]

I have installed the Stebel compact airhorn on my RT. I got the proper male connector to allow the use of the existing horn wiring to be utilized to provide the hot feed for the 30 amp relay. It does throw a fault to the canbus due to the lack of oem horn resistance. Does anyone know the resistance of the oem horn. If I insert a resistor in series on the feed line to the relay, I believe I can eliminate this fault condition.

[moze229]

Originally Posted by Nail24

I have installed the Stebel compact airhorn on my RT. I got the proper male connector to allow the use of the existing horn wiring to be utilized to provide the hot feed for the 30 amp relay. It does throw a fault to the canbus due to the lack of oem horn resistance. Does anyone know the resistance of the oem horn. If I insert a resistor in series on the feed line to the relay, I believe I can eliminate this fault condition.

If you find an answer to that, let me know because it looks like I'll have to do the same thing. I already bought my horn. I went with the FIAMM Freeway Blaster. I've used it on another bike I had before and it's loud enough for me.

I've read quite a few threads on here about people installing these though and I've only seen it mentioned a couple of times about the CanBus. I wonder if people are just installing these and ignoring the fault? If I can't find a way to do this without creating a fault condition then I may not do it.

Matt

[Guest24]

Originally Posted by moze229

If you find an answer to that, let me know because it looks like I'll have to do the same thing. I already bought my horn. I went with the FIAMM Freeway Blaster. I've used it on another bike I had before and it's loud enough for me.

I've read quite a few threads on here about people installing these though and I've only seen it mentioned a couple of times about the CanBus. I wonder if people are just installing these and ignoring the fault? If I can't find a way to do this without creating a fault condition then I may not do it.

Matt

I installed the Stebel on a '04 11S w/ ABS and never had a problem.

[jduke]

TM, you sure? I could swear I remember reading an article by Anton on R bike wiring and it seems CANBUS was introduced with the R1200GS. Not sure though. Maybe Anton will jump in.

[Guest24]

Originally Posted by jduke

TM, you sure? I could swear I remember reading an article by Anton on R bike wiring and it seems CANBUS was introduced with the R1200GS. Not sure though. Maybe Anton will jump in.

I think you are right. CanBus eliminated the need for fuses.

[moze229]

Originally Posted by jduke

TM, you sure? I could swear I remember reading an article by Anton on R bike wiring and it seems CANBUS was introduced with the R1200GS. Not sure though. Maybe Anton will jump in.

This is the article I think you are referring to:

CAN-bus technology

Looks like I do not have to worry about it.

Matt

[Guest24]

Originally Posted by moze229

This is the article I think you are referring to:

CAN-bus technology

Looks like I do not have to worry about it.

Matt

Like I said, CanBus = No fuses.

[throttlemeister]

Well I can still find plenty of references to CAN bus on the R1100S, but it could be introduced only with the latest models. Or I could be talking out of me *** again due to the wonderful way BMW documents their stuff.

[Guest24]

TM, I need the resistance value on the oem horn. The one on my RT is exactly the same as the one I took off the 11S.

[moze229]

Originally Posted by throttlemeister

Well I can still find plenty of references to CAN bus on the R1100S, but it could be introduced only with the latest models. Or I could be talking out of me *** again due to the wonderful way BMW documents their stuff.

LOL. Well, I don't think that's true. I think there is just some misunderstandings due to BMW's excellent, well-rounded communication. At any rate, the two things in the article that set me off is that Anton mentions the CANBUS being part of the 'new' 1200's. The date of the article was 2006 and the R11S was not made after 2005 to my knowledge. Secondly, there is a sentence explaining how the 'older' wiring works near the middle of the write-up. There is a phrase, "Since the R1100 models didn't have this wiring..." (referring to CANBUS).

Like I said, I've seen those articles mentioning the R11S and CANBUS as well, so I suppose it depends on what source we want to go with. From what I've seen and heard, Anton is a very good source to go by so I guess I'm saying that my bike does NOT have CANBUS at this point

Nail24 also cleverly pointed out that CANBUS = no fuses, and this seems to correspond to Anton's diagram in his explanation of CANBUS.

I am in no way knowledgable about these bikes as one would see from other posts that I've made. But I can say that I do understand a little more after reading Anton's write-up.

Matt

[Guest24]

TM, I get .7 oms on the multi meter. What say any others here?

[Boybiker3]

Originally Posted by Nail24

TM, I get .7 oms on the multi meter. What say any others here?

Home multimeter resistance values below an ohm don't have much validity. There's no easy way to measure horn resistance except dynamically ("under load") and that's more complicated. Horns (or lamps, motors, etc.) just ain't that kind of animal that can be measured directly.

moze229 -

Just use the stock wiring. See reply #3.

The only reason to deviate would be for a burglar alarm system - a mercury-bulb gravitation switch from a cannibalized old house thermostat would be a piece of cake to wire up, if you can protect the mercury from all possible exposure on a bike!

[Guest24]

BB3, there must be a resistance value for the horn somewhere. Or I can measure voltage out the other side of the windings and back into the resistance that way. I need the CanBus documentation to find it. This horn has been around for years. Didn't it take a 5 amp fuse in the 11S?

[moze229]

Originally Posted by Nail24

BB3, there must be a resistance value for the horn somewhere. Or I can measure voltage out the other side of the windings and back into the resistance that way. I need the CanBus documentation to find it. This horn has been around for years. Didn't it take a 5 amp fuse in the 11S?

On the 2004 R11S with one fuse box, it's on a 10A circuit with clock and an auxiliary outlet. On earlier years (before they used the single fuse box), it may be different because of the layout of the fuse panels.

Matt