Toyota Yaris Forums - Ultimate Yaris Enthusiast Site
 

 


 
Go Back   Toyota Yaris Forums - Ultimate Yaris Enthusiast Site > Technical Forums > DIY / Maintenance / Service
  The Tire Rack

Reply
 
Thread Tools Display Modes
Old 02-21-2014, 09:20 AM   #1
barryware
 
Drives: 2007 Yaris Liftback
Join Date: Sep 2006
Location: Chicago
Posts: 129
A/T Neutral Switch

2007 yaris hatch / AT

When I bought the car (new), I immediately installed a Rostra cruise control. This is the same unit the dealer would install.

Lately, when the cruise control is engaged it will shut off as if you were to tap the brakes. More often than not, it shuts off when I hit a bump.

There is only one wire that goes through the firewall and connects to a wire harness plugged into the transmission. I believe this wire connects to the neutral switch wire.

My question: When the car is placed in neutral, does the neutral signal wire get grounded, or does it get a voltage signal?

I'm thinking that over the years / miles, the Rostra wire may have gotten some insulation rubbed off and now it is rattling around and when circumstances are right, the wire may go to ground and disengage the cruise.

I haven't really checked it out just yet because the weather has been so bad. Even in my garage, the floor is always wet, it is cold, etc.
barryware is offline   Reply With Quote
Old 02-21-2014, 10:00 AM   #2
CTScott
ULTIMATE
 
CTScott's Avatar
 
Drives: 09 5dr LB, 2x 08 3dr LB
Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
The connection to the blue wire in pin 9 of connector C27 on the park/neutral switch will measure 12 volts when the shifter is in the park or neutral position. Otherwise it measures zero volts. So, I don't think that wire is your issue, as it would have to short to a 12 volt source to make the rostra unit think you have shifted out of gear.
__________________
CTScott is offline   Reply With Quote
Old 02-21-2014, 10:19 AM   #3
barryware
 
Drives: 2007 Yaris Liftback
Join Date: Sep 2006
Location: Chicago
Posts: 129
Thanks CT.. That is why I asked the question so I don't spend time chasing my tail.

I'll have to remove the CC module and check / clean all the connections and see if that makes a diff.

Something is loose / dirty.. Hitting bumps does make it drop out.
barryware is offline   Reply With Quote
Old 02-21-2014, 10:41 AM   #4
CTScott
ULTIMATE
 
CTScott's Avatar
 
Drives: 09 5dr LB, 2x 08 3dr LB
Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
Quote:
Originally Posted by barryware View Post
Thanks CT.. That is why I asked the question so I don't spend time chasing my tail.

I'll have to remove the CC module and check / clean all the connections and see if that makes a diff.

Something is loose / dirty.. Hitting bumps does make it drop out.
That's a tricky one. The Rostra has a crazy number of connections and of course you can't just wiggle wires while parked to troubleshoot it.
__________________
CTScott is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY - Bypassing Tire Pressure Warning System (TPWS / TPMS) CTScott DIY / Maintenance / Service 217 08-11-2021 11:20 AM
DIY - Headlights off with the Ignition Switch CTScott DIY / Maintenance / Service 46 11-03-2018 08:42 PM
DIY (08' USDM LB): Interior Light Color Change revnull DIY / Maintenance / Service 37 05-21-2016 12:59 PM
Replacement Map Light Switch? Meteorite_Marty Cosmetic Modifications (Exterior/Interior) 8 11-12-2013 10:18 PM
replacement fog light switch? yrsdrgn Cosmetic Modifications (Exterior/Interior) 4 07-17-2007 04:11 PM


All times are GMT -4. The time now is 11:49 AM.




YarisWorld
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.