Put cabin fan speed control in your hands with the Standard Ignition RU-503, a Mazda 3 blower motor resistor that regulates the current sent to the heater and A/C blower motor to set its speed. It is a direct-fit replacement for the 2005 Mazda 3, the 2008-2009 Mazda 3, and the 2009 Mazda 3 Sport.
The HVAC blower motor resistor sits in the fan circuit and controls the blower motor's speed settings. A resistor that has failed may leave the fan running on only some settings. Wiring, the fan switch or the motor can cause similar symptoms, so diagnose the cause before replacing the part.
Fitment: 2005 Mazda 3 · 2008-2009 Mazda 3 · 2009 Mazda 3 Sport. See the Buyer's Guide tab for engine details.
Interchange: RU1196 · JA1672 · BR406 · BVTB61B15
This part cross-references / interchanges with the following part numbers:
Is this a 2005 Mazda 3 blower motor resistor?
Yes. The RU-503 is listed for the 2005 Mazda 3, the 2008-2009 Mazda 3 and the 2009 Mazda 3 Sport. See the Buyer's Guide tab for engine details.
What are signs a Mazda 3 blower resistor may need replacing?
Common signs are a blower that works only on some settings or skips certain fan speeds. Wiring, switches or the motor can cause similar symptoms, so diagnose the cause first.
What does a blower motor resistor do?
It varies the current that reaches the blower motor. This gives the heater and A/C fan its different speed settings.
What are the RU-503's electrical connectors made of?
Standard Ignition uses premium copper electrical connectors. The company says they give more precise resistance values for better resistor performance and a longer part life.
Which part numbers does the RU-503 interchange with?
It interchanges with RU1196, JA1672, BR406 and BVTB61B15.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
