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The EFI relay has nothing to do with cranking. It's activated as soon as the ignition is turned on until two seconds after the ignition is turned off to allow the ISCV to home. There is no difference in it during cranking. The M-Rel gets biased through a transistor so it's current handling is...

I know Pi said the the M-Rel is powered by the IGSW but according to the Toyota tech articles the M-Rel is powered by the Batt wire which is powered by the 15A EFI fuse. Hopefully he can pop in here to mention if anything has changed since he started digging deeper into the TCCS. It's a pretty...

Love to do what I can to help. Might start a new thread though, since the OP resolved his issue. Make it easier for people with similar problem to search for it. I'll follow you over there. When you start it, list where you did your voltage drop tests, what the voltage drop you're seeing is. And...

Lol sorry that was a pretty short answer. The MIL being out was kind of the give away. While the MIL is indeed powered by the 7.5A GAUGE fuse. The ground is switched by the TCCS, allowing the light to function. That Diagnostic circuit, that the MIL light is apart of, is powered by the IGSW input...

Understandable, not everybody does. I do a lot of night driving outside of the city. I run my interior lights as low as possible while still being easily readable to help with night vision. Less light inside the cabin means less your eyes have to adjust when you look outside. That is why I have...

Ok yeah you should be fine then. Certain higher end models give you the ability to variably dim the head unit. One wire will be an orange wire and labeled as "Illumination 12+" the next wire will usually be orange with a white tracer(wire colors are typical but not the rule) and labeled as "Dim"...

Which head unit are you going to be using? Like year or whatnot?

Yeah, I'm not sure the exact year it changed, but the early radios didn't have a variable illumination. It was on or off. So they didn't have that wire. Then the radio received an update and got that feature. At that point the wire was added and ran to the rheostat junction block. You must have...

Huh. What do you mean your dash wouldn't be lit? A 12v signal is sent along a green wire when the lights are turned on to the radio illumination circuit. The ground for that specific and isolated circuit goes back along the White/Green wire to the Light Control Rheostat, that introduces a...

Unless the photo is wrong, that is a white wire with green tracer. The is "Illumination -12v"(note this is a negative line) it goes to the rheostat and controls the intensity of the interior illumination.

Check your 7.5A IGN fuse. Located behind the driver side kick panel.

http://www.cygnusx1.net/Supra/Library/EPC/291410/catalog.aspx?F=5304&P=1 Only diagram I could find of it. Item #:53209 and 53633 Might give you an idea or two.

You sure you have enough fuel in the tank?

Lol, figures. I hate not having a reason for something to fix itself. Never gives me confidence that it won't come back. Well wrap the bare spot on those wires. Fix that white wire. And test it out for awhile.

Ok, verify that both pins(17) look ok, and reconnect the connector. Then turn the ignition on and retest for 12v on the Black/Orange wire out in the engine compartment.

Yeah, male pin side of should have 12V when the ignition it on.

Which side? Male or female? Edit: Sorry I forgot to mention that the ignition need to be on when testing.

That's good. The ignition is doing what it is supposed to do. The thing is, that Black/Orange wire that comes out of pin 7 is the same one you were testing for 12V out in the engine compartment that was jumpered. For some reason it is not receiving power from the ignition switch. you showed pin...

The picture shows from the ignition switch side. So for the body side, the numbers connect up the opposite way. You actually have power on pin 4 and 8, which is correct. It also means your AM2 fuse is good. Interestingly there is no pin 5. Next go to the ignition side of the connector. So the...

Na, look again. The wire that the jumper is connected to on the other end is the Black/Red coming off pin 4 of the EFI Main Relay. So that wire will only receive power when the EFI Main Relay is activated by the M-rel signal, which the ECU turns on when it receives a IGSW signal from the IG2...