If your AC/Heater Blower speed always runs 1) low or 2) high, see attachment for fix.
The most likely cause is the linear controller module for 1) , and the resister (resistor) for 2).
It is rarely the $850 electronics module in the dashboard.
This is poorly documented in the available publications and even Lexus service was confused and provided incorrect info.
I will be happy to provide info in pdf, but was not able to attach. If you tell me how, I will.
I have this same problem, blower only runs on high. It started after someone stole my stereo and so kindly cut all the wires to the AC control head. So I had to get the plug ends from a salvage yard and re-wire the whole mess, not to mention a new control head. Now the blower only works on high speed. Yes, it is wired correctly. However I did get it wrong the first time because there are several wires that are color coded the same. So I may have caused something to "burn" out. Anyway if you could send the file to me I will greatly appreciate it. marioanest@gmail.com
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Hi there,
I have the same problem, the blower runs on "low". Would you mind sending your PDF to me? My e-mail is erikcopeland@comcast.net.
Thank you!
Erik
I wish I had found this months earlier, I have this same problem.
Blower Speed Mystery Solved
in 92 - 06 Lexus ES250/300/330
Posted
I wish I had found this months earlier, I have this same problem.