Dome Lamp: Description and Operation

Power is supplied at all times
^ to room lamp relay terminal (1)
^ through 1O A fuse [No. (39) located in the fuse block (in relay box)]
^ to interior lamp terminal (3),
^ to spot lamp terminal (2) (Except convertible models) or (3) (Convertible models),
^ to luggage room lamp terminal (1),
^ to trunk room lamp terminal (1), and
^ to each toot lamp terminal (1).

Switch operation
With interior lamp switch ON, ground is supplied to turn interior lamp ON.
When a door switch is set to OPEN with interior lamp switch in DOOR, ground is supplied
^ to room lamp relay terminal (2)
^ through diode (B40) terminal (4) (2+2 seater models) or terminal (1) (2 seater models)
^ to diode (B40) terminal (2)
^ through diode (B10) terminal (6)/(7)/(8)
^ to diode (B10) terminal (1)/(2)/(3)
^ through door switch LH/door switch RH/back door switch and body grounds (B7) and (B32).

Interior lamp control by time control unit
Time control unit receives a signal to turn interior lamp ON and fade out when door switch LH is opened then closed with interior lamp switch set to DOOR. Ground is then supplied
^ to interior lamp terminal (1)
^ through time control unit terminal (20)
^ to time control unit terminal (15)
^ through body grounds (M3) and (M90).
With power and ground supplied, the interior lamp turns ON. After door switch is closed, interior lamp illuminates at about halt brightness, then fades out.

INTERIOR LAMP TIMER
When the door switch LH is turned from ON to OFF (LH door opened, then closed), interior lamp (except for convertible models) or spot lamp (for convertible models) turns on and fades out (with interior lamp or spot
lamp switch set to DOOR). This function is controlled by the time control unit.