DIY: 2006-2011 Yaris OEM Cruise Control Complete Installation

[jackab]

Originally Posted by CTScott

If the cruise symbol lights up, then you are good for the ECM connection. If your can't get the "SET" light to come on (and the cruise to actually work), then the clutch switch may not be installed correctly.

The clutch switch needs to be fully depressed when the clutch pedal is not touched in order for cruise to work. If you installed the switch in too far, then it will not actuate when the clutch is at rest and therefore will not allow cruise to work.

The Rostra 250-1836 kit is essentially identical to what I sell, but for a whole lot more money. (The older kits were a custom Rostra product, but the new ones are just the OEM switch, etc.)

I checked the clutch, and it looked like the clutch pedal was depressing it enough, but I extended it a bit more anyway. The cruise control still didn't work. I removed the clutch switch wires and went for another drive. Cruise control still didn't work even though the cruise control dash came on. When installing the kit, it seemed too simple an installation for the cruise control to actually work. Does the device send radio signals to the ECM to tell it what to do?

[CTScott]

Originally Posted by jackab

I checked the clutch, and it looked like the clutch pedal was depressing it enough, but I extended it a bit more anyway. The cruise control still didn't work. I removed the clutch switch wires and went for another drive. Cruise control still didn't work even though the cruise control dash came on. When installing the kit, it seemed too simple an installation for the cruise control to actually work. Does the device send radio signals to the ECM to tell it what to do?

When you say you removed the clutch switch wires, did you unplug the OEM connector that was taped to the harness just above the clutch pedal, or did the Rostra kit include its own wiring for the clutch?

The stalk is a wired connection to the ECM. It is simply four switches and three resistors and the ECM sees the voltage drop across the resistor when one of the switches is pressed. The clutch switch is also a switch input to the ECM, which routes through one of the connectors in the under-hood fuse panel to get there.

[jackab]

The Rostra instructions said to splice the two wires from the clutch switch to the two wires leading to the A29 connector. The connector was taped up out of the way and was not connected to anything. The CC should work without the clutch switch installed, so I disconnected those wires. Still, the dash CC indicator light comes on and CC doesn't work. I will next take the airbag off and make sure everything is done right there, but it's so simple that even I should be able to get it right.

I installed one of the old style Rostra CC units in my 2010 Yaris, and it works well. It cost a lot more and is more elaborate. The 2011 Yaris belongs to my wife. Her knee is hurting her, and the cruise control helps a lot, so we need to get it going. (You probably didn't need to know all that.)

Thanks for all your time and help.

Bill Foreman
Moab, UT
Mountain Biking Capitol

[CTScott]

Originally Posted by jackab

The Rostra instructions said to splice the two wires from the clutch switch to the two wires leading to the A29 connector. The connector was taped up out of the way and was not connected to anything. The CC should work without the clutch switch installed, so I disconnected those wires. Still, the dash CC indicator light comes on and CC doesn't work. I will next take the airbag off and make sure everything is done right there, but it's so simple that even I should be able to get it right.

I installed one of the old style Rostra CC units in my 2010 Yaris, and it works well. It cost a lot more and is more elaborate. The 2011 Yaris belongs to my wife. Her knee is hurting her, and the cruise control helps a lot, so we need to get it going. (You probably didn't need to know all that.)

Thanks for all your time and help.

Bill Foreman
Moab, UT
Mountain Biking Capitol

The CC will not work unless the clutch switch is indeed connected properly. It is a normally closed switch and the ECM needs to see that connection and will abort cruise when it is not.