08 hummer sut, windows up/down, master switch

Is there a way to tap off the "Master Switch" on a Hummer for the windows? A customer has a 08' and there is a single switch that will roll up or down all 8 windows - is there a way to use a 530T to operate the master switch??

I proposed using 2 530T's but the customer wants them all to go up and down at the same time like the "Master" switch does. Who knows.

Doesn't the switch go through a processor? You'd have to power that up or else it might only work when ignition or R/Start is enabled.

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Test before boxing up.

Directwire: -
The up - down wires are lt. blue/black (+) - lt. blue / YELLOW (+) at the global window switch, gray 5 pin plug, pins C and B.
Above relates to H2 master switch. It expressly forbids 530t, won't work.
I suggest you let us know year and model next.

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Test before boxing up.

My apologies, it was in the title - it's a 08' H2 SUT.

I am a bit confused by the "forbids" comment...so I can't use a 530T on this particular vehicle or I can use it to accomplish the up/down from the master switch?

My apologies, should have read the title, anyway here's the full quote: -.
Accessory Installation Warning! Window module such as the 530t that isolate the switch from the window motor at rest will not work in this vehicle. We recommend using a 529t type window module. There is also a global window switch on the driver dash. The up - down wires are lt. blue/black (+) - lt. blue / YELLOW (+) at the global window switch, gray 5 pin plug, pins C and B.
Test, you may be able to do this with a pair of aux outputs and 2 relays.

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Test before boxing up.

Thank you very much...seems pretty straight forward.