HVAC Rear Blower Motor Circuit Malfunction
What does B1319 mean?
The B1319 code means the vehicle's onboard diagnostic system has detected: HVAC Rear Blower Motor Circuit Malfunction. This is a low severity code.
Common Symptoms
- Rear AC or heat blower not working
- No air flow from rear vents
- Rear blower only works on some speeds
- Rear passengers uncomfortable due to no climate control
- Rear blower control buttons unresponsive
Probable Causes (Ranked by Likelihood)
- Failed rear blower motor Very High
- Faulty rear blower motor resistor High
- Defective rear climate control panel Moderate
- Wiring issue to rear HVAC unit Low
Step-by-Step Diagnostic Procedure
-
Test rear blower motor at all speed settings
-
Check voltage at rear blower motor connector
-
Test rear blower resistor or controller
-
Inspect rear climate control panel for function
-
Check wiring from front HVAC module to rear unit
Frequently Asked Questions
Do all vehicles have a rear blower motor?
No. Rear blower motors are typically found in minivans, large SUVs, and some larger sedans with rear climate control zones. Smaller vehicles use the front blower only.
Where is the rear blower motor located?
The rear blower motor is usually located in the rear cargo area or under a rear seat, behind a trim panel. In minivans, it is often on the right rear quarter panel area.
Can the rear blower fail independently from the front?
Yes. The rear blower motor, resistor, and controls are separate from the front system. A rear blower failure does not affect front HVAC operation.