Body, generic

B0330 HVAC Rear Blower Motor Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Rear blower speed controller or resistor burnt out
Rear blower motor seized or brushes worn
Speed command wire open or shorted between modules
Rear blower fuse or supply relay failed

Symptoms

  • No air from the rear vents
  • Rear blower runs only at one speed or cannot be switched off

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–450
Time0.5–3 h

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

Parts involved

rear blower motorrear blower resistorhvac control module

Related codes

B0184B0181

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