The cruise control in my '09 GS 350 is no longer working. When I press the button I see the light, but nothing happens when I try to not set it. After paying the diagnostic fee at the dealer, they determined that I need an new ECU for $1250. Does this sound right? I am wondering if there is possibly another solution.

 

I quickly looked up the details on the system and you have 1:the steering wheel switch 2: cruise control ecu under the dash 3: Distance sensor near the radiator.

I would start by checking the fuses, make sure theres power going to that module. Next unplug and replug the module, if no change remove the ecu and open it up and see if theres anything wrong or corroded in it. You can take it to a ecu repair shop and some are able to repair such things. Or you can go to the junkyard and buy a used ecu. Did the dealer atleast give you a part number?

 

In the ohio area from a junkyard search car-part.com2006
Chassis Control Box(not Engine)
Lexus GS300AKS130115$100Keiffer Auto & Truck Recyclers MIDW USA-OH(Canton) Request_Quote 1-330-484-3100 Request_Insurance_Quote
2006
Chassis Control Box(not Engine)
Lexus GS30003/05 3.0L ATA00017163$75Lancaster Auto Recycling MIDW USA-OH(Lancaster) Request_Quote 1-800-860-1297 Request_Insurance_Quote
2006
Chassis Control Box(not Engine)
Lexus GS30004/06,3.0L,AOD,CRUISEAT2825$CallYoungstown Auto Wrecking LLC-MIDW USA-OH(Youngstown) Request_Quote 330-743-1492 Request_Insurance_Quote
2007
Chassis Control Box(not Engine)
Lexus GS350080041$CallNorthtown Auto Parts USA-OH(Toledo) parts@NorthtownAutoParts.com?subject...ll%2C%20080041 419-531-7777 / 800-430-66102007
Chassis Control Box(not Engine)
Lexus GS35010/06 3.5L A AS-ISD8A1174$CallGrade A Auto Parts of Cincinnati USA-OH(Cincinnati) Request_Quote 513-321-9278 / 937-853-4470 Request_Insurance_Quote2007
Chassis Control Box(not Engine)
Lexus GS350$A Grade 198k Warranty Available AS-ISA917E$CallGrade A Auto Parts of Dayton USA-OH(Dayton) Request_Quote 937-263-2516 / 937-853-4470 Request_Insurance_Quote

 

It sounds like they did all of that during diagnostics which took several hours. I did not get a part number, I was only told it was the ECU/ECM. They said it was not covered by my extended warranty, which was determined to be inaccurate by my resources. Shortly after, the service department contacted me and said they would cover it since I am a loyal customer. Ummm thanks?

 

Awesome im glad you got a free fix, even though they tried to stiff you

 

I don't know where to even begin guessing on that...

 

So this isn't exactly resolved yet. They installed the new ECU and the cruise control worked fine, but then took it for one more test drive and it stopped working once again!!! Apparently they are reaching out to their corporate resources on this. Stay tuned...

 

Did you ever get it working for good?