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U0519 Invalid Data Received From Door Switch D

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Door switch unit D reports the positions of its buttons as coded data. Inside such packs several contacts often share one input through resistor networks or comparators, as Microchip explains for the switch interface of its LIN chips ATA6641/ATA6642, and the stages of a window rocker are distinguished by voltage level. Worn or wet contacts can then yield combinations the receiver regards as impossible, such as up and down at the same time, and the frame is thrown away. No manufacturer assigns D to a particular door or documents U0519; GM's Saab 9-5 code list, for example, handles the rear door switch panels under separate codes, U0203 and U0204. A sticky or water-damaged switch pack is the most likely cause; U0218 covers complete loss of the unit.

Likely causes

Worn, sticky or wet contacts producing impossible switch combinations
Electronics of switch unit D faulty
Poor ground or damaged data wire to the switch

Symptoms

  • Window moves the wrong way or not at all from this switch
  • Express function triggered or missing unexpectedly

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–300
Time0.3–1 h

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

Parts involved

door switch d

Related codes

U0218U0518U051A

References: ww1.microchip.com, saabwisonline.com.