98 LS400 HVAC Blower motor - ClubLexus - Lexus Forum Discussion

Notices
LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

98 LS400 HVAC Blower motor

Old 10-05-18, 12:14 PM
  #1  
vette22
Driver School Candidate
Thread Starter
 
Join Date: Apr 2010
Location: tn
Posts: 6
Thanks: 0
Thanked 1 Time in 1 Post
Default 98 LS400 HVAC Blower motor

I let my 93 LS go a couple of years ago with 300,000 miles on it, what a car! I currently have a 2004 LS 430 with about 100k and all is great. My 98 has about 190K ( another great car) the blower motor is intermittant and I understand it is wired a bit different than previous years. I have been looking for an electrical diagram that might help me out when I start to trouble shoot or any experienced advice would be great.

Thanks in advance, Mike
vette22 is offline  
The Following User Says Thank You to vette22 For This Useful Post:
spuds (10-05-18)
Old 10-05-18, 04:40 PM
  #2  
spuds
Lexus Test Driver
 
spuds's Avatar
 
Join Date: Jan 2018
Location: SoCal mtns.
Posts: 823
Thanked 63 Times in 60 Posts
Default

Nice to hear about your experiences with these cars,thanks.
spuds is offline  
Old 10-06-18, 08:28 AM
  #3  
Yamae
Lexus Champion
 
Join Date: Aug 2011
Location: Japan
Posts: 2,141
Thanked 143 Times in 113 Posts
Default

Originally Posted by vette22 View Post
I let my 93 LS go a couple of years ago with 300,000 miles on it, what a car! I currently have a 2004 LS 430 with about 100k and all is great. My 98 has about 190K ( another great car) the blower motor is intermittant and I understand it is wired a bit different than previous years. I have been looking for an electrical diagram that might help me out when I start to trouble shoot or any experienced advice would be great.

Thanks in advance, Mike
Attached is the electrical diagram related to the blower motor. The blower controller contains a power IC which has a PWM circuit inside to change the fan speed by the signal "SI". It comes from the A/C control computer.

As far as I have experienced, intermittent no run problems were not caused by the power IC. Either/both brushes or/and the commutator in the blower motor were about to wear out.


Last edited by Yamae; 10-06-18 at 08:31 AM.
Yamae is online now  
Old 10-08-18, 02:09 PM
  #4  
vette22
Driver School Candidate
Thread Starter
 
Join Date: Apr 2010
Location: tn
Posts: 6
Thanks: 0
Thanked 1 Time in 1 Post
Default 98 Blower

Thanks Guys, !!
vette22 is offline  
Old 11-08-18, 04:52 PM
  #5  
deuce189
Driver School Candidate
 
Join Date: Feb 2010
Location: South Carolina
Posts: 32
Thanked 1 Time in 1 Post
Default

Figured I’d bring this back. Mine has been doing the same thing lately too. Except if I kind of smack on passenger side in the foot well up against the center console my fan starts blowing again. Darnest thing. I’m crossed unless I just start replacing everything.
deuce189 is offline  
Old 11-08-18, 06:25 PM
  #6  
Yamae
Lexus Champion
 
Join Date: Aug 2011
Location: Japan
Posts: 2,141
Thanked 143 Times in 113 Posts
Default

Originally Posted by deuce189 View Post
Figured Iíd bring this back. Mine has been doing the same thing lately too. Except if I kind of smack on passenger side in the foot well up against the center console my fan starts blowing again. Darnest thing. Iím crossed unless I just start replacing everything.
That's the typical symptom of wearing out brushes in the motor. The commutator is barely touching brushes.

Those brushes are not in the parts list. The quickest way to fix is to replace the motor. But a skilled guy would only change brushes finding something equivalent. https://www.ebay.com/bhp/replacement-brushes-motor
Yamae is online now  
The Following User Says Thank You to Yamae For This Useful Post:
deuce189 (11-09-18)
Old 11-09-18, 02:14 AM
  #7  
deuce189
Driver School Candidate
 
Join Date: Feb 2010
Location: South Carolina
Posts: 32
Thanked 1 Time in 1 Post
Default

Originally Posted by Yamae View Post
That's the typical symptom of wearing out brushes in the motor. The commutator is barely touching brushes.

Those brushes are not in the parts list. The quickest way to fix is to replace the motor. But a skilled guy would only change brushes finding something equivalent. https://www.ebay.com/bhp/replacement-brushes-motor
thanks! Is our blower motor easy to get to? Iíve been trying to find an exploded diagram or a video.
deuce189 is offline  
Old 11-09-18, 04:15 AM
  #8  
Yamae
Lexus Champion
 
Join Date: Aug 2011
Location: Japan
Posts: 2,141
Thanked 143 Times in 113 Posts
Default

Originally Posted by deuce189 View Post
thanks! Is our blower motor easy to get to? Iíve been trying to find an exploded diagram or a video.
The motor is located under the cabin filter and you can get to it rather easily if you are not too big. See attached below. This is for a 98 Celsior (RHD) and there may be some differences with yours but the structure must be almost the same.

Yamae is online now  
The Following User Says Thank You to Yamae For This Useful Post:
deuce189 (11-09-18)


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: