Here is the result of my visit to the dealer to see what caused the cruise control to cesase functioning. Apologies for the poor photos.
In the first photo is the switch which has been damaged.The silver strip on the right has “somehow” got bent when I installed the Wunderlich lever, but I have no idea how that was possible, as installation is merely a case of inserting the rod and tightening the lever to the bar mount.
Picture 2 shows the clutch lever from the reverse side. The switch shown on the right is the one where the contact has been bent ( in this pic removed). There are two contacts, both should look like the metal strip on the left. Moving the clutch lever actuates these contacts.
Picture 3 shows the clutch housing with the lever removed, but with the switch held in the position it would be mounted in. The clutch actuator rod fits into the hole on the right.
There is a problem in how BMW have sought to find the error. They have a process which is, plug in the diagnostic, which shows the cruise control switch is not working. When this fault shows, but that the physical switch itself is ok, then it sends the mechanic on a direct route to the assumption that the fault is in the “failsafe” part in the injection system.
I asked why there is no “commonsense” check of the switch behind the lever, as this is a 5 minute mount and dismount job, whilst the injection “fix” is 5 hours of dismantling the whole bike! It seems that BMW do not consider this as a possibility as it is extremely rare for this part to fail, and seems mechanics do not have enough ability to think laterally, and in my case, wonder if the fitment of shiny Wunderlich levers might have been the cause!
I complained that it is not reasonable to demand a days labour for a fault which they did not diagnose correctly, and am back today to see if we can come to an “accomodation” on the costs invoiced. I’ll keep you posted.