Cruise control on 2007 4dr

[CTScott]

Originally Posted by Fazulka

I read several threads on installing cruise control on the 07-08 yaris and decided to try it, but it doesn't work.

I inserted a wire to the hole for pin 40 on the A21 connector as shown in several threads. I metered this connection and found that the connection works, I get 12.6-12.8 volts when the car is on from the other end of the wire.

I decided to do the 4 button install and bought 4 N.O. push buttons and installed them on the empty power mirror panel. I purchased 3 packs of resistors, 220 ohm, 150 ohm, and 680 ohm.

Between on/off and +/res I soldered 1 220 ohm (According to my meter it was actually 217). Between +/res and -/set I soldered a 220 and a 150 (370 total, measures 365). Between -/set and cancel I soldered a 680 and a 220 (900 total measures 884).

After building it and testing it, I found it didn't work. I added a 22 ohm resistor between on/off and +/res to bring it closer to the middle of the acceptable ranges. It still didn't work.

I hooked the the meter to the leads coming out of the buttons and checked the impedance I am getting from this thing I built. They show:

No buttons pressed - 1 / no connection
on/off button pressed - 1 ohm (possibly from alligator clips connecting leads to device)
+/res - 239 ohms
-/set - 604 ohms
cancel - 1487 ohms

The car runs exactly as before, so I don't think I messed anything up. There is no light on the dash to turn on, so i don't know if the system is turning on or not. Nothing appears to happen when I press any of the buttons.

Sorry for the long message, but I wanted to include enough info.

Any ideas why it doesn't work?

Does your Yaris have an automatic or manual transmission?

[Fazulka]

Originally Posted by CTScott

Does your Yaris have an automatic or manual transmission?

It has an automatic transmission.

[CTScott]

Originally Posted by Fazulka

It has an automatic transmission.

OK, so that means it's not the lack of the clutch cruise control switch.

Reading your initial post, it sounds like everything is correctly wired. The one thing you don't mention is where you grabbed the ground for the other leg of the switches. Make sure that you have a good solid ground.

Also. posting some pictures would help.

[Fazulka]

Originally Posted by CTScott

OK, so that means it's not the lack of the clutch cruise control switch.

Reading your initial post, it sounds like everything is correctly wired. The one thing you don't mention is where you grabbed the ground for the other leg of the switches. Make sure that you have a good solid ground.

Also. posting some pictures would help.

Ok, I'll take some pictures this afternoon. I have one ground from a self tapping screw that is under the cover your knees would bump if you pulled the drivers seat too far forward. I am using it as ground for 2 other things, the remote start / keyless entry module and power door locks. Is that an ok place? Where would be better?