Body, generic

B0184 Rear Blower Motor Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

No publicly available J2012 list includes B0184, and no maker documents it as a rear blower code. In Saab's 9-3 climate control the number belongs to the solar sensor: B0184 06 means that circuit is open or shorted to ground, and the system then regulates as on an overcast day. GM's Global A models report a rear blower speed circuit fault as B0208; GM bulletin PIT5383A lists B0208 among the HVAC codes of several 2015 GM models. Rear blowers serve the second and third rows of vans and large SUVs. In the 2011 Saab 9-5 an auxiliary blower module converts a PWM command into a motor voltage between 2 and 13 V, and a grounded, open or shorted command line stops the rear fan. A Hyundai patent notes that a stalled HVAC motor can draw several hundred mA. A related code is B0330.

Likely causes

Long harness run to the rear blower open or shorted, often at body joints or under trim
Auxiliary blower control module or rear resistor failed
Rear blower motor worn or blocked by debris drawn in through the rear intake

Symptoms

  • No airflow from the rear roof or floor vents
  • Rear seats stay warm in summer or cold in winter while the front is comfortable

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–450
Time0.5–2.5 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

B0330B0181B0186

References: saabwisonline.com, saabwisonline.com, static.nhtsa.gov, patents.google.com.