1996 Blower Motor Resistor
#1
Driver School Candidate
Thread Starter
1996 Blower Motor Resistor
Greetings. Just purchased a 1996 LS400 that looks to be in great shape. Failed Virginia State Inspection for a high pressure power steering hose leak and the defrost fan not blowing enough. Hose I can replace soon enough but the fan has me stumped at the moment.
The blower motor runs on low only when the automatic climate system is turned on. I believe that points me to the blower motor resistor. Does anyone have the pin diagram and resistance values I should be showing with the multimeter?
Thank you in advance.
The blower motor runs on low only when the automatic climate system is turned on. I believe that points me to the blower motor resistor. Does anyone have the pin diagram and resistance values I should be showing with the multimeter?
Thank you in advance.
#2
Moderator
Greetings. Just purchased a 1996 LS400 that looks to be in great shape. Failed Virginia State Inspection for a high pressure power steering hose leak and the defrost fan not blowing enough. Hose I can replace soon enough but the fan has me stumped at the moment.
The blower motor runs on low only when the automatic climate system is turned on. I believe that points me to the blower motor resistor. Does anyone have the pin diagram and resistance values I should be showing with the multimeter?
Thank you in advance.
The blower motor runs on low only when the automatic climate system is turned on. I believe that points me to the blower motor resistor. Does anyone have the pin diagram and resistance values I should be showing with the multimeter?
Thank you in advance.
Another item I'd better inform you is that the A/C computer is sending the correct voltage to the blower motor controller or not. This can be manually checked observing the voltage changing 8.4V to almost 0V when you change the fan speed MIN to MAX.
Last edited by Yamae; 01-18-19 at 08:39 PM.
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Comet041 (01-26-19)
#3
Lexus Test Driver
Greetings. Just purchased a 1996 LS400 that looks to be in great shape. Failed Virginia State Inspection for a high pressure power steering hose leak and the defrost fan not blowing enough. Hose I can replace soon enough but the fan has me stumped at the moment.
The blower motor runs on low only when the automatic climate system is turned on. I believe that points me to the blower motor resistor. Does anyone have the pin diagram and resistance values I should be showing with the multimeter?
Thank you in advance.
The blower motor runs on low only when the automatic climate system is turned on. I believe that points me to the blower motor resistor. Does anyone have the pin diagram and resistance values I should be showing with the multimeter?
Thank you in advance.
https://www.clublexus.com/forums/ls-...r-problem.html
Looks like your vehicle doesnt have a BM resistor.
Blower speed is controlled by a BM controller.
Located right next to the blower motor. (2 connector, 3 wire and a 2 wire)
Im guessing the 2 wire goes to the BM to control the input speed. (power/ground)
The other 3 wires im guessing as well -- power and ground, one might be the from the display control switch to select blower speed.
The following users liked this post:
Comet041 (01-26-19)
#4
Driver School Candidate
Thread Starter
Blower motor controller it is! All I was thinking of was cost of throwing parts at the problem. Weeks went by and I had decision paralysis. Local Import shop to the rescue. Controller good, resistor good, fan good. The dealer installed cellular phone was the culprit. The vehicle decided that a call was coming in from the defunk phone and reduced the fan speed to low so the call could come through without a lot of noise. Import garage disconnected a ground wire in the system and full functionality is back.
#5
Blower motor controller it is! All I was thinking of was cost of throwing parts at the problem. Weeks went by and I had decision paralysis. Local Import shop to the rescue. Controller good, resistor good, fan good. The dealer installed cellular phone was the culprit. The vehicle decided that a call was coming in from the defunk phone and reduced the fan speed to low so the call could come through without a lot of noise. Import garage disconnected a ground wire in the system and full functionality is back.
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