RX - 1st Gen (1999-2003) Discussion topics related to the 1999 -2003 RX300 models

'99 RX300 Cruise control not working - how to fix?

Old 11-03-10, 09:45 AM
  #1  
s@squ@tch
Driver School Candidate
Thread Starter
 
s@squ@tch's Avatar
 
Join Date: Jan 2009
Location: OR
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Default '99 RX300 Cruise control not working - how to fix?

The cruise control light comes on in the dash, but does not control the speed anymore - just pure decceleration.

Can this be fixed w/o taking to the dealership?

Anyone have a copy of the repair manual that has floated around this board in the past?
Old 11-03-10, 09:55 AM
  #2  
hypervish
Lexus Test Driver
 
hypervish's Avatar
 
Join Date: Aug 2009
Location: NJ
Posts: 5,698
Received 88 Likes on 75 Posts
Default

This may sound like a dumb question, but are you setting the speed? Once pressing the on button (by pushing in), you have to push the stick up to set the speed. And then only will it stay at the same speed.
Old 11-03-10, 10:43 AM
  #3  
bmwboyee
Driver School Candidate
 
bmwboyee's Avatar
 
Join Date: Oct 2010
Location: TX
Posts: 46
Likes: 0
Received 1 Like on 1 Post
Default

I have the same exact problem. I do set the speed. I try every button on the cruise control. It does not work but when you click the cruise control (on) button it lights up in the dash.
Old 11-03-10, 12:20 PM
  #4  
s@squ@tch
Driver School Candidate
Thread Starter
 
s@squ@tch's Avatar
 
Join Date: Jan 2009
Location: OR
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Default

Yes, I am pressing the button to set the speed.

It won't hold any speed anymore, doubt it is a fuse, as I checked the diagram and didn't see any dedicated cruise control fuse to be blown. If it was a fuse, I'd see other systems not working.
Old 11-03-10, 03:25 PM
  #5  
defo
Intermediate
iTrader: (6)
 
defo's Avatar
 
Join Date: Nov 2005
Location: Scottsdale, AZ
Posts: 436
Likes: 0
Received 10 Likes on 5 Posts
Default

Originally Posted by s@squ@tch
Yes, I am pressing the button to set the speed.

It won't hold any speed anymore, doubt it is a fuse, as I checked the diagram and didn't see any dedicated cruise control fuse to be blown. If it was a fuse, I'd see other systems not working.
Could be a vacuum leak, but I don't know how to test for that.
Old 11-06-10, 07:45 AM
  #6  
maxSteel
Instructor
 
maxSteel's Avatar
 
Join Date: Oct 2009
Location: nj
Posts: 1,127
Received 240 Likes on 202 Posts
Default

I have the cruise control info. But when I try to upload it the upload fails.
I don't know why.
Old 11-06-10, 08:43 AM
  #7  
salimshah
Moderator
 
salimshah's Avatar
 
Join Date: Apr 2001
Location: Austin, TX
Posts: 15,260
Received 992 Likes on 897 Posts
Default

Going on limb here ..

The accelerator cable goes over a 1/2 circle on throttle body. The other half is the cable from the cruise control module which is pretty much at the top of the engine .. positioned in line with the passenger. First examine that linkage. I dont think it is controlled by vacuum. I would suggest clearing out the ecu by disconnecting the battery for 20 mins or so ... just in case there are some gremlins in the software.

Salim
Old 11-06-10, 01:10 PM
  #8  
bmwboyee
Driver School Candidate
 
bmwboyee's Avatar
 
Join Date: Oct 2010
Location: TX
Posts: 46
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by salimshah
Going on limb here ..

The accelerator cable goes over a 1/2 circle on throttle body. The other half is the cable from the cruise control module which is pretty much at the top of the engine .. positioned in line with the passenger. First examine that linkage. I dont think it is controlled by vacuum. I would suggest clearing out the ecu by disconnecting the battery for 20 mins or so ... just in case there are some gremlins in the software.

Salim
I need to check my linkage but i did clear everything out. didn't work.
Old 11-11-10, 07:43 AM
  #9  
bmwboyee
Driver School Candidate
 
bmwboyee's Avatar
 
Join Date: Oct 2010
Location: TX
Posts: 46
Likes: 0
Received 1 Like on 1 Post
Default

does anyone have a solution for this?
Old 09-07-11, 12:45 PM
  #10  
Xtom73G
Driver
 
Xtom73G's Avatar
 
Join Date: Sep 2011
Location: Arizona
Posts: 129
Likes: 0
Received 0 Likes on 0 Posts
Default

I found the module in engine compartment. Carefully pressed release tab on electrical connector, pulled connector free. Squirted electro repair conductor grease into each cavity on plug, wiped clean, re-plugged. All functions now perfect.
Old 05-06-13, 03:36 AM
  #11  
BearsLexus
Driver
 
BearsLexus's Avatar
 
Join Date: Nov 2011
Location: Ohio
Posts: 113
Likes: 0
Received 12 Likes on 4 Posts
Default

Originally Posted by Xtom73G
I found the module in engine compartment. Carefully pressed release tab on electrical connector, pulled connector free. Squirted electro repair conductor grease into each cavity on plug, wiped clean, re-plugged. All functions now perfect.
Xtom, Is this still working properly? I am starting to have this same issue. Where is the module you mentioned located, as I would like to attempt the same repair?

Thanks,
Bear
Old 02-28-18, 11:12 PM
  #12  
leroyjnav
Driver School Candidate
 
leroyjnav's Avatar
 
Join Date: Feb 2018
Location: CA
Posts: 23
Received 2 Likes on 2 Posts
Default

Has anyone found a solutions for this? BearsLexus, how did you fix your cruise control problem? I have the same issue, does not work anymore.

Thank you.
Old 05-14-19, 02:33 PM
  #13  
Stevedud
Driver School Candidate
 
Stevedud's Avatar
 
Join Date: Oct 2012
Location: Nj
Posts: 22
Received 1 Like on 1 Post
Default

I’m having the same problem now. Cruise worked in the morning, on the way to work but afterwards, nope. Hasn’t worked since. Disconnected battery still nothing.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
MSterling
ES - 7th Gen (2019-present)
1
04-12-19 07:23 PM
Gmansr
ES - 6th Gen (2013-2018)
5
05-02-17 05:40 PM
Toog4me
GS - 2nd Gen (1998-2005)
8
08-20-02 06:21 AM
Daddy-O
RX - 1st Gen (1999-2003)
6
06-09-02 07:43 PM


Thread Tools
Search this Thread
Quick Reply: '99 RX300 Cruise control not working - how to fix?



All times are GMT -7. The time now is 02:18 PM.