What is the easiest firewall pass through to get a wire from the engine compartment to interior

Each of the two rubber grommets shown where the engine compartment wire harness passes through the firewall (one near the right end of the firewall, and one just inboard of the brake actuator) includes at least one (maybe two?) extra rubber nipples that can be pierced to pass additional wires through.

 

These two? And that’s a plan view, front end towards bottom of pic? Probably seeing the actual item is easier; the pic just gets you started, but just trying to understand the pic.

 

Drill a new hole. Use a hollow punch cutter to cut through the carpet and the insulation, before drilling with a step Unibit. Then, use a runner grommet to protect the wires.

A technician servicing the car will immediately know that it is not OEM and to segregate it from the original systems to make his or her job easier.

 

Yes.

The dog-leg taken by the wire harness near the one grommet is where it goes under the brake actuator assembly, which may help with locating that grommet in the engine compartment. From within the cabin, it would therefore be somewhat to the right of the brake pedal pivot, closer to above the go pedal. That's the one I poked my fog light wire through.

As the grommets are already designed for this kind of extensibility, I wouldn't see much need to drill extra holes.

What's the new wire needed for?

 

one feller found a way to snake a cable from the side of engine wall, next to the driver side wiper end of the chassis, up between the driver door fender and into the left instrumental panel perfectly. I thought that was genius so no drilling required.

 

The grommet location and how to poke through it is described in the installation instructions in the first post of this thread.

https://priuschat.com/index.php?threads/80168/

I used a coat hanger with the wires taped onto it to pass the wires for my foglight switch, after poking through a nipple on the grommet by the brake actuator with an icepick first.

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