What year is your Passat? I believe MY10 onwards were prewired to the boot, and all you need is a module and short harness from it to the bar. I think something like this.
Passat B6 Towbar & Passat B7 Towbar - LED Towbar Wiring Kit - Australia Tow Bars & Performance store
Might be cheaper to get one from the wreakers if yours is pre-wired.
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