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Sidestand Switch 1 & 2 & Calculated

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NZRalphy:
Hi Guys

I have a fault on my BMW 2008 R1200GSA and I have my GS911 plugged in to fault find.

Via real time values - Sidestand switch is working ok (and I check with another switch), clutch switch is working ok, gear position is showing correct gears. However when I put the bike into gear the engine cuts out as though I didn’t pull the clutch or the side stand is down.

When i go to the real time values page I can see there are three Sidestand Switches - 1 & 2 & Calculated. 

When i move the side stand, and Sidestand Switch 1 shows retracted or extended as per movement.

Sidestand switch 2 remains extended no mater what I do and I assume this is why the sidestand switch Calculated remains extended.

What am i missing? How do I get SSS 2 to change status

Thanks,  Ralph

marchyman:
I believe it is the same physical switch.   The schematic shows three wires to the switch in a Single Pole Double Throw configuration.   When the sidestand is moved the bike should see one throw open and the other throw close.   I haven't a clue why BMW does it that way.

To verify your switch is bad unplug the switch from the harness and jumper between pins 1 and 3 at the connector going toward the BMS-K.   The bike should start.

macmanaman:
My 2cents: is that BMW uses 2 position switch sensors to avoid in the case of a big bump the side stand move a bit and this provoking the engine to cut.

Regards.

karlh:

--- Quote from: macmanaman on August 29, 2025, 12:43:10 AM ---My 2cents: is that BMW uses 2 position switch sensors to avoid in the case of a big bump the side stand move a bit and this provoking the engine to cut.

--- End quote ---

I don't think so.  Such a bump would probably result in both poles being open.  The calculated switch position would therefor be extended, and the engine would die.  I suspect is just another example of BMW over-engineering.

WayneC:
Perhaps some thought should be considered to the difference between year models

The original side stand switch was a single pole single throw switch which changed the circuit supplying earth, the Part No between models changed with differences in cable length & connector to the harness, other starter lock outs were in play with diodes separating the circuits

Clearly on later models the individual lock outs, side stand/clutch/neutral, were moved to connection to an ECU & a firmware routine utilised to achieve a "calculated result" eliminating the diodes, circuit diagrams will provide the answers

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