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small 4x3x1 black box under the center dash is the RABS ABS controller, believe the prem. sound system amp is mounted in behind center dash on passenger side next to radio/stereo system
The manual is very clear about that box. It's the RABS computer. Normally, when you turn the key on, the RABS light goes on for a few seconds while it goes through self-diagnostic. But if you unplug that box, you'll see that the RABS light doesn't go on at all.