A/C blower issue

Tiny
DIVIDES
  • MEMBER
  • 2013 HONDA PILOT
  • V6
  • 2WD
  • AUTOMATIC
  • 186,000 MILES
The screen display changes when I change the blower speed, but the blower is always on high, is this usually the A/C resistor?
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Wednesday, May 4th, 2022 AT 9:23 AM

3 Replies

Tiny
STEVE W.
  • EXPERT
That vehicle doesn't use a conventional resistor array for blower speeds, it uses a pulsed wave control that turns a transistor mounted on the blower motor on and off in pulses to adjust the blower speed. They can fail open or shorted normally and they work by turning the ground connection on and off. So shorted would give you full speed regardless of the settings and open would mean no blower. Testing is somewhat easy as the transistor only acts like a heavy-duty switch, so you remove the lower sound deadener pad under the right-side dash. Then access the blower motor and the controller. With it turned on unplug the wiring connection, now use a test light connected to ground to gently probe the red wire, turn the blower to high speed and back a few times, the light should go from full brightness to dimmer as the blower speed goes down, it should go out if you switch the HVAC off. If that works it is the transistor, Honda part 79330SDGW51. Replacement is simple, remove the two screws, pull the module, install the new one and reconnect the connector. Then reinstall the sound deadener panel.
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Wednesday, May 4th, 2022 AT 10:18 AM
Tiny
DIVIDES
  • MEMBER
My stupidity, turned out the rear air was on high but I just couldn't see that it was coming from back for some reason, all good.
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Saturday, May 7th, 2022 AT 9:39 AM
Tiny
STEVE W.
  • EXPERT
Okay, that's a different "solution" but it works. LOL.
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Saturday, May 7th, 2022 AT 10:09 AM

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