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So about every 8-10th time I start the GTR, the 4wd light comes on about 5 seconds later. If I turn off and start again, it goes off and stays off.

Will be taking to mechanic for a service + brakes replace/check and this as well, wondering if SAU knows what it could be :) I'm guessing perhaps due to cold (where I am is pretty cold, and often I don't start the car for a couple days), or perhaps low fluid, or some electrical relay.

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https://www.sau.com.au/forums/topic/368942-r32gtr-4wd-light-intermitent/
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When you do have the light lit, leave the ingition on and open the boot. Look on the underside of the parcel shelf and the left hand module has a led indicator in a see-through port on the bottom. Count off the flashing sequence and look in the manual for the fault code relevant.

Leave the sub there and take the control module out? What more do you want? At least it has a fault light so you can do some diagnosis, rather than guessing..

Serious though, maybe an inspection mirror will let you see it, unless you have enclosed the lot.

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