U0260Lost Communication With Seat Control Switch Module A
- Generic OBD-II code · Network
- How the car detects it
- Many power seat switches now contain electronics that scan the keys and report the result over a LIN or multiplex link rather than carrying motor current. A Lear patent describes a seat motor assembly with integrated electronics that talks to an external switch over a one- or two-wire multiplex link. Mercedes shows such a switch failing for series 206 to 297, for example C-, E- and S-Class, GLC and EQS: the door-mounted switch group for seat adjustment (front left: SSE-VL) could remain in sleep mode after a software error, so the seat did not move although the quick test stored no fault; unplugging the switch resets it, new switch software prevents a repeat (LI82.00-P-080029). No manufacturer documents U0260 publicly. When switch module A stops sending, its seat cannot be adjusted from it; switch B is U0261.
- What you may notice
- Seat cannot be adjusted with its switch
- Memory, lumbar or massage keys on that switch without function
- Likely causes
- LikelySwitch module software stuck in sleep mode, reset by unplugging and fixed by update
- PossibleLoose or corroded connector or broken wire at the switch in the door or seat trim
- PossibleLIN line to the seat module shorted or open
- RareInternal failure of the switch module
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.