See, I am a Land Cruiser guy. FJ40 and an LX450. I got my daughter a 99 4Runner and was putting a CB into it today and used the 12V from one of the spare power outlets. I spliced into the back of one. Tested the CB and it works fine. Got into start it and it would crank and no start. The remote controls didn't work anymore. Everything esle worked.

Friend came over and figured out the EFI fuse was blown. This disables the vehicle for some reason. Replaced the fuse and it started right up.

I felt stupid because I checked all the Fuses I THOUGHT were involved with what I touched.

So - If your rig won't start and your remote won't do anything, Replace the EFI 20AMP (yellow) fuse under the hood.

FJ40's are a lot easier to work on. No computers!

 

EFI - electronic Fuel injection. Gotta have fuel to run.

I did that one time...mine blew at a stop light. Had to roll it over to the side fo the road. Luckily I found it and replaced it with a spare I keep in the glovebox.

 

Not just the fuel. It disabled the remotes and the power door locks unless the Key was in the start position.

 

The EFI fuse is the poor man's security system. I pull mine whenever I'll be parked for a long time (airport, trailhead, etc) or in a not-so-nice area (my brother's house).

 

Ditto.