Body, generic

B0503 Right Rear Power Window Circuit Malfunction

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Public J2012 lists do not contain B0503, and no carmaker publishes a description, so the code is unverified. The title names the right rear window circuit. In the 9-3, Saab's right rear door module sets B3205 04 for an open down path and b3992 11 when the glass travels further than expected between its end stops; one-touch up and pinch protection then stop working. GM's 2011 9-4X gives this motor B3220, for example after an internal motor fault. FMVSS 118 lets a window close by itself only if it reverses before 100 N, which a module that has lost track of the glass cannot ensure. International Rectifier's US6906487B2 drives such a motor through an H-bridge with short-circuit and overtemperature cut-off.

Likely causes

Regulator cable or guide slipped, glass travel no longer matches
Right rear window motor worn or internally faulty
Motor or door plug corroded by water in the door

Symptoms

  • Right rear window does not open or moves only jerkily
  • One-touch closing and pinch protection disabled
  • Window stops short of the top seal or runs past it with noise

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–450
Time0.5–3 h

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

Parts involved

right rear window motorrear door modulebody control module

Related codes

B0502B0501U0225

References: saabwisonline.com, saabwisonline.com, saabwisonline.com, patents.google.com.