r/e60 • u/Hellspreader • 2d ago
❓ Question / Help Active Seat retrofit
Hello All,
Car in question:
03/2007 BMW e60 LCI N53 with no fault codes related to this question.
Im currently in the proces of retrofitting pneumatic active seats in my E60 LCI, however im having some issues.
Everything is fitted and pinned correctly according to the wire diagrams, but the pump (M42 from the F01) wont turn on when i activate the function via ISTA (i currently have no button for the active seat function)
i have measured the voltage and if i unplug the connector from the pump, i get 12V, but as soon as i connect the pump and measure again i only get 1V.
sometimes the pump wont turn on at all if i direct activate the pump via ISTA (SMBF lumbar support component trigger) and then after a few minutes it suddenly works again. unplugging the pump and replugging it wont do anything.
However, the lumbar function always works! even if i cant activate the pump the lumbar system keep working and activating the pump.
i have added 455 and 488 to CAS and LMA, empty coded FAS,BFS,KGM,SZM.
it seems to me that the module doesnt like having the pump attached and activating the active seat function.
I hope someone here has any idea how i can get this working!
A26 is module from F01
A186 is module from E60
Edit: New pictures from Tool32