B0330HVAC Rear Blower Motor Circuit
- Generic OBD-II code · Body
- How the car detects it
- B0330 cannot be found in accessible J2012 lists or carmaker sources, and it overlaps B0184 in content. The rear blower moves conditioned air to the back rows, often as a second fan in a rear duct (US6915650B2) or a separate rear unit with its own speed control (US4949779A). GM's 2011 Saab 9-5 and 9-4X log the circuit as B0208: the climate module sends a PWM speed command to an auxiliary blower control module that converts it into 2–13 V at the motor; 01 means that line is always high, 06 always low or floating, and the rear blower stops. Typical faults are a seized motor, a burnt speed controller or a broken command wire.
- What you may notice
- No air from the rear vents
- Rear blower runs only at one speed or cannot be switched off
- Likely causes
- LikelyRear blower speed controller or resistor burnt out
- PossibleRear blower motor seized or brushes worn
- PossibleSpeed command wire open or shorted between modules
- RareRear blower fuse or supply relay failed
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.