Hey! Some poorly paid, over-worked, lube guy trying to move up from the oil stained slums of "the pit" worked really hard to shove that hokey pile of crap up under your dash!
Honestly, if I were you, I'd get it removed and have them repair your ignition wiring. Between the cheapo Gaurdian and KARR units my old dealership used for a while, they're nothing but trouble. At some point the box or the relay (if it's using an external one) will fail and you'll get a "No-Start" condition thanks to that thing. Was very common to have a year or two old Toyota towed in with the customer unable to start the vehicle, but be amazed I drove it into my stall only to quote them an hour to gut the unit and repair the wiring. My old dealership phased out installing those on new vehicles, that and those horrid SureStart Battery Saver crapola things.
(By the way, pro-tip: if you do have one of those things wedged up under your dash and your car's not starting and you suspect it to be the culprit. A paper clip and/or extra length of wire jammed between where they splice the ignition wire usually gets her choochin' again!

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As for the "hush" panel, I assume you mean that plastic panel they use on the passenger's side to cover the HVAC blower housing and mount an ECU or two to? I don't think the 4Runner has one on the driver's side, I could be wrong. Seems some vehicles have it on the driver's side and some don't.