B0181Front Blower Motor Circuit Low
- Generic OBD-II code · Body
- How the car detects it
- B0181 is missing from every publicly available J2012 code list, and no carmaker publishes it as a front blower code. Saab does use the number, for something else: its 9-3 climate control stores B0181 05 when the left floor air mix temperature sensor input rises above 4.8 V, i.e. open or shorted to B+. In GM's later Global A climate control the front blower speed circuit is B0193; a general blower circuit has the code B0283. Read as titled, a circuit low fault means the blower feed or speed line sits too low. In the 2011 Saab 9-5 the climate module sends a PWM command that the blower module turns into 2 to 13 V at the motor; with that line grounded or open the fan stops. Older systems step the speed through resistor paths instead.
- What you may notice
- Front blower does not run at all or only at the highest stage
- Windscreen demists slowly because almost no air reaches it
- Likely causes
- LikelySpeed command line between climate module and blower module open or chafed to ground
- PossibleBlower control module or series resistor burnt out, often after a sluggish motor drew too much current
- RareBlown fuse or melted connector in the blower power feed
- 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.