BMW Switchgear wiring

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tngarren:
2021 R18 but topic would generally apply to all CAN bus BMWs.

I had to replace the plastic cruise control controls on the left-hand switchgear. Like most of my work, I fixed one thing and broke another. Now the cruise control works, however, the horn and turn signals stopped working. The other functions on the switchgear work - cruise control, flashers, high beam, menu, aux lights.

All the functions run off 3 CAN bus wires - 12V, CAN L, and CAN H. They are getting 12V, 7V, 7V to ground with ignition on. So, I am thinking the problem is on the switchgear.

I have disconnected the battery to reset the bike control units but no help.

Is there a way to read the CAN bus data to see if the horn and turn signal buttons are sending any data?

Any other diagnostic advice is appreciated.

Pic attached. Four circled buttons are left, cancel, right. Bottom is horn.

https://imgur.com/a/XSyNCBs

schuppi:
Hello

This is what the GS911 is designed for.
Here you can read the real-time data in the Body Controller Lite XBCL and check its functionality.

tngarren:
I am sorry, I do not understand. I can see some real time values like temperature and horn on, etc. with my GS-911. However, I cannot sniff the real time CAN buss data packets.

schuppi:
# I cannot sniff the real time CAN buss data packets #

Sorry,
This is not possible
other devices would be required.

botus:

--- Quote from: tngarren on October 05, 2025, 08:08:23 PM ---2021 R18 but topic would generally apply to all CAN bus BMWs.

I had to replace the plastic cruise control controls on the left-hand switchgear. Like most of my work, I fixed one thing and broke another. Now the cruise control works, however, the horn and turn signals stopped working. The other functions on the switchgear work - cruise control, flashers, high beam, menu, aux lights.

All the functions run off 3 CAN bus wires - 12V, CAN L, and CAN H. They are getting 12V, 7V, 7V to ground with ignition on. So, I am thinking the problem is on the switchgear.

I have disconnected the battery to reset the bike control units but no help.

Is there a way to read the CAN bus data to see if the horn and turn signal buttons are sending any data?

Any other diagnostic advice is appreciated.

Pic attached. Four circled buttons are left, cancel, right. Bottom is horn.

https://imgur.com/a/XSyNCBs

--- End quote ---

did you dismantle the switch or swap the entire thing ?

if you swapped it out - is the new one OK - everything plugged in - maybe plug in the old one and see where you are - no need to mount it to the bike

these things are strange and sometimes multiple versions exist - dependant upon the toys on a given bike -
on my GS they all behave differently but you'd think they were all compatible parts - they are not - they don't just switch - they use weird beard different resistances and magically different wires connected up inside to the multiplug

you must match the exact same part number

example

01 Combination switch left 1 61319467929 (says cruise)
01 Combination switch left 1 61319467931

https://www.realoem.com/bmw/en/showparts?id=0L11-EUR-04-2021-K34-BMW-R_18_0L11,_0L13_&diagId=61_6744

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