ECU-b pulling power

So the battery on my 08 4L was dead again... and so I got fed up of buying new batteries for it. So with a bran new batterie I pulled fuses to see what was pulling the power( with the key out of the truck and doors shut) turns out the ECU-b was pulling .50 amps all the time.
Now the other problem . The truck cranks but no start.
I've used either to see if it was fuel but seems like no spark.

 

So the Body ECU is drawing a half of an amp or 500 milli amps.

If that is true you have a problem.

ECU B supplies these functions:

ABS (w/ VSC), TRAC, VSC, Auto LSD, Downhill Assist Control and Hill–Start Assist Control
Accessory Meter
Air Conditioning
Combination Meter
Cruise Control (1GR–FE)
Cruise Control (2TR–FE)
Door Lock Control
Electronically Controlled Transmission and A/T Indicator (1GR–FE)
Electronically Controlled Transmission and A/T Indicator (2TR–FE)
Engine Control (1GR–FE)
Engine Control (2TR–FE)
Engine Immobiliser System (1GR–FE)
Engine Immobiliser System (2TR–FE)
Headlight
Interior Light
Key Reminder
Light Auto Turn Off System
Multi Mode 4WD and Rear Differential Lock
Power Outlet (115V)
Power Window
Rear Differential Lock (2WD)
SRS
Tire Pressure Warning System
Wireless Door Lock Control

 

What’s aftermarket on your rig? If so start unplugging such devices ??

 

Only a light bar and that's been unplugged

 

Try a different key or turn the key upside down and insert it into the ignition.

 

What circuit did you tap for the light bar?
Is the switch and relay still hooked up?
I’d start there, may not be the problem, but it’s a start.

 

Its is it's own circuit with a relay to the batt. Including the switch side

 

This may be a long shot but if you have access to or know someone that has a thermal camera you could look it over with that after it's been sitting overnight and see if there's any warm spots, otherwise your probably gonna be down to unplugging things. As for the no start you need to see if your missing fuel or spark, do you have a security light flashing?

 

I have tryed with starter fluid to see if it's a no fuel but that didnt work, I was going to pull a spark plug to see for spark but it started to snow, I will try that next.
And no there isn't any lights on the dash.
I tryed to scan the truck but the obd, but it powers off after a few seconds when the trucks motor isn't running( this was a problem before this issue aswell)

 

You said you were pulling fuses are you certain you put them all back where they belong? it's easy to miss one, look for slots that have both pins in them and see what they feed and you may get lucky.

 

Yes I checked all the ones I pulled and all the slots , I even checked all the relays except the fuel pump because its differnt then the rest

 

Check the under dash fusebox. Make sure you didn’t stick IG1 or IG1NO2 in the blank spot beside them.

 

I did that while installing new stereo. Started truck all kine lights on on dash . Checked wiring several times and all fuses all good . After couple hours go it a nite . Went on TW looking at pics of fuse boxes and . Put fuse in wrong hole lol. put back were suppose to and all good .

 

Solved crank no start:
Under fuse block efi 2 fuse from efi relay wire was shorting/ broken
As to the ecu still working on it.

 

It's an ALWAYS ON fuse/circuit. Nothing to check.