The delay circuit is built in to the lamp ass'y. However, it could be receiving a false 'door-ajar' signal too, from a bad doorswitch. It might pay first to pull those switches out to see if one has a problem.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7