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?