Yes exactly, the auto lights was a separate option, and meant you got the 'high' BCM wired to drive all the lights, while the light switch then would have been a standard VW CAN-bus type one with the little plug.
Since the Transporter goes under the 'commercial vehicles' range, most T5 (even T5GP) just got the old-style mk4 plug,whereas the new-style CANbus plug was standard since Golf mk5 on the passenger vehicles...
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