Remote Start DIY Wiring Guide 2006-2010 Yaris

[CTScott]

Originally Posted by adam1981

Thanks for the guide in the OP... I successfully connected a remote start/alarm with the use of it. I have to do some more research for some of the alarm items though.

I do have one area of concern. When the Yaris is running under the control of the remote start unit, there is a buzzing sound coming from underneath the dash from what looks like a relay - but there is no label for it (I already looked in the manual too). It is the blue box on the bottom center of wiring harness panel where you connect the positive parking light.

The sound goes away after you put the key in, on, and press the brake.

Is this sound normal for this vehicle when using remote starts?

It sounds like the positive light feed is backfeeding the flasher relay. The Yaris is really a negative switched, not positive switched vehicle. I wired mine as a negative, but posted the positive option, as I noticed it documented on a keyless entry DIY. Looking at the EWD, wiring positive to 4A-29 will cause a backfeed. It will not hurt anything, but will produce that annoying buzz.

With your remote starter, can you select negative instead and wire to the negative wire instead? If not, you can use a standard automotive relay as an inverter: