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I would poke around what looks like a lone relay, IIRC the 4 together is the run relay(S) used to be one big one, the FETs are for the per-heat

Maybe the "smart start" boxes have a relay or FET switch controlling the starter. Unfortunately I have not found any board level documentation, there are allot of different boxes. This does not mean they are not out there!!:) I generally just go in and trace the circuit I am having issues with.

Have you tried it with the inside plug pulled off of the EESS and the outside plug connected? If so then it must be in the box, could be full of water among other things. If you only have the inside plug removed and there is no start signal then it is in the dash wiring.

Good question!!

Not likely the EESS, the start circuit just passes through the box, You can disconnect both connectors and try. You can also slide under it and disconnect the start lead from the starter. BE VERY CAREFUL!! that arc at the battery can cause a battery explosion, wear safety gear when messing with...