Network, generic

U0524 Invalid Data Received From Door Window Motor B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0524 means the master accepts frames from window motor B but not what they say. A common reason is a position value the controller cannot reconcile. Smart lift motors count Hall pulses between a learned lower and upper end, and Atmel's anti-pinch application note AVR480 describes acquiring such parameters during initialisation and spotting a defective Hall sensor from a run of apparent direction changes. After a battery disconnection, a motor replacement or a regulator that has slipped, the stored travel no longer matches reality, and many systems fall back to manual operation until the window has been re-initialised. No manufacturer publishes setting criteria for U0524 or the door assigned to B. U0223 covers a motor that has stopped answering.

Likely causes

End positions lost after battery disconnection, motor or regulator work
Hall sensor in motor B faulty, giving erratic position counts
Regulator cable or glass clamp slipped, so travel no longer matches

Symptoms

  • One-touch operation lost on that window
  • Window stops short of the top or reverses near the seal

Repair estimate

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

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

Parts involved

door window motor b

Related codes

U0223U0523U0525

References: ww1.microchip.com, nxp.com.