can you tell what the grey wire inside is for?
car without auto headlight :
headlight switch plug T10/5 - BCM T73C/31 left : red/yellow ---- T46B/40 right side :red/black ------ T46B/3
car with auto headlight :
headlight switch plug T10/A - BCM T73A/29 left : red/yellow ---- T46B/45 right side :red/black ------ T46B/5
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