The wiring diagram I have to hand is for a 3SGE so while the principals are the same the wiring colours may not be.
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I have provided them just in case.
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The starter relay is the green one in the boot next to the ECU.
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The brown connector on the starter has 1 wire in it
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(black w/white stripe on 3SGE).
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That wire goes to pin 4 of the starter relay which is the high current side of that relay.
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The other side of the high current side is a white wire which goes through the ring/stud wiring terminal on the starter
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- from there there is a black wire with a red stripe which goes straight to the battery.
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So first check that you have 12V at pin 2 of the starter relay
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- if not there is no feed from the starter/battery to the relay.
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Additionally this white wire that goes from the ring terminal on the starter to pin 2 of the starter relay has a fusible link in it, so if you do NOT have 12V at pin 2 of the starter relay, check continuity between the ring connector on the wiring at the starter and pin 2 of the starter relay.
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Check you have continuity between pin 4 of the starter relay and the wire in the brown plug at the starter.
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The relay has a ground going to pin 3 which in the 3SGE is a white wire with a black stripe.
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Check that pin 3 of the relay goes to ground/earth/negative terminal of the battery.
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That only leaves pin 1 which is the signal from the ignition barrel.
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This goes to positive when you turn the key to the STA position.
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This wire's red at the starter relay.
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Get a mate to turn the key to the STA position and see if this wire goes to
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+12V.
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I'm assuming that all the other electrics through the ignition switch work, as the car runs with the starter bridged to
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+12V.
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So if everything I've said above checks out have a look at pin 6 from the ignition switch
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(red on the 3SGE).
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This goes to pin 9 on the ID4 connector
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(in the passenger footwell) and from there up the passenger side of the car into pin 8 of connector EA3 which is the larger of the 2 white plugs in the engine bay fusebox.
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ID4 is a 12pin join between the dash loom and the loom that runs down the side of the car.
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