Am also looking for wiring diagrames for the interior light of my 91 525. As the time delay portion no longer works. Light works off door handle but only comes on for a split second when you open the doors. What I do know is the light is controlled by the CCM ( something control module ) under the rear seat on the left hand side. Pulling this module in and out sometimes makes the light come on and never go off though. I believe it may be a Bosch unit?!!!?