B0205HVAC Defroster Door Position
- Generic OBD-II code · Body
- How the car detects it
- B0205 is absent from the published J2012 lists, and no carmaker documents it for the defroster door; a defrost door circuit has the code B0278. Saab files its 9-3 defrost door motor under B0240 06 and B0241 01, where an open, grounded or B+ shorted motor circuit leads to wrong air distribution. The defroster door sends air to the windscreen. MOTOR magazine notes that most electronic climate actuators report door position through a potentiometer driven by their gear train, as a signal of roughly 0 to 5 V. Older layouts get by without one: in Hitachi's CA1266779A a two-position actuator just flips the vent door between face vents and defroster, and US4819715A drives a shutter that opens either the upper vents or the defroster nozzle. A position fault means the door is not where it was commanded.
- What you may notice
- Little or no air reaches the windscreen in defrost mode
- Air comes from the wrong outlets or a clicking noise is heard behind the dashboard
- Likely causes
- LikelyDefroster door actuator with stripped gears or worn feedback potentiometer
- PossibleDoor or linkage binding, broken or blocked by foreign objects
- RarePosition feedback or reference wire open or shorted
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.