Just to make it clear:

1) Is the Brant not powering up the electrical system of your WRX when you put your code in ?

or is it:

2) The car won't start after the Brant code is entered and car powered up. ie. engine cranks but car won't start up ?

If its number 2 then I would check the Crank Angle Sensor.
Subaru would surely have checked this when buggering about with the Brant. ???

Other questions:
What ECU - you really have to find out !!!!

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"You can turn your back on a person, but, never turn your back on a drug. Especially when it's waving a razor-sharp hunting knife in your eye." - Raoul Duke

try leaving the keys in the on position, just before you crank for 10 seconds. Then try and start the car.

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Mazda CX-7
Mitsubishi Evo X MR

well at the moment i dont put in the code. i thought it was in valet mode.. but its been doing that for bout 2 weeks now.

no the engine doesnt turn over, it just doesnt send a signal to start.

ill try the 10 second thing.. bit crap if i have to do that everytime thought...

This may seem silly, but are you doing the following:

Put keys in
Turn to IGN
Type in code and wait for the yellow check engine light to come on
Turn keys to on to crank the engine
Engine Starts

??

From what you have described it sounds like you are not turning the car on after entering the code, when you switch the car off and then turn it back on the code is still 'active' and will thus start. Also sounded like the car was in Valet mode when it worked for 10 tries.

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

if it doesnt start after u put ur code in, press the star button
should start after that

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[S]kid[S]

yeh i have.. i had a b4 before this.. im doing everything right.. then engine light doesnt come on..

So after entering your code the yellow engine light doesn't come one? Does the keypad make any noises after entering the code?

Check you are entering the correct code if so take it back to Subaru to fix. You do turn the key after entering the code (the keypad doesn't start the car)?

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

no it is a problem with the car i think... the key light doesnt go off... like its not sensing it.. the only problem is im in esperance.. 700km away

mine does this too sometimes, after entering code the fuel pump should prime but in these instances it does not

When its all working properly you can hear the pump prime after entering your code (especially if you have an aftermarket pump)

only happens every now and then (once every month maybe) im hoping this '02 brant recall will fix it

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MY02 WRX STi - sold :(
'12 Golf GTI

mine happens 50% of the time....