VW Golf IV 2001 ABS Issues

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I get today in garage a Golf IV (VIN: WVWZZZ1JZ1B051240), 2001, AJM, for some works, but the ABS light are lighting on dash. Diagnosing with VCDS, I get 01276 error code. My experience with ABS is almost 0, I decide ask you some help. Famous program say that this code mean-wiring, pump motor, ABS control module. How I know where is the problem between pump motor and ABS module, cause wires are checked and all are OK.

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