Network, generic

U0561 Invalid Data Received From Seat Control Switch Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Modern power seat switches are often small control units of their own: they read the keys and send the result to the seat module over LIN instead of switching motor current directly. A Lear patent describes a seat electronics unit with a LIN driver that acts on commands from such an external switch. Mercedes documents a case for 2026 models: the seat adjustment switch group in the door (front left, SSE-VL) could stay in sleep mode, so the seat no longer moved; unplugging the switch resets it and new switch software prevents a repeat. Lincoln traced missing lumbar settings on the 2022 Aviator partly to the seat switch part level (SSM 51056). U0561 is set when frames from switch module A are implausible; U0260 is the lost-contact code. No bulletin names U0561.

Likely causes

Seat switch module software fault (e.g. switch stays in sleep mode)
Switch part or software level not matching the seat module
Loose or corroded connector at the seat or door switch
Seat control switch module A internally faulty

Symptoms

  • Seat cannot be adjusted with the switch
  • Seat settings such as lumbar not shown or not selectable on the screen

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–400
Time0.2–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

seat control switch module a

Related codes

U0260U0562

References: static.nhtsa.gov, patents.google.com, static.nhtsa.gov.