Grand Caravan FWD L4-2.4L VIN B (1997)
Key Cylinder Lamp: Description and Operation
CIRCUIT OPERATION
Power for the lamp is supplied on circuit F41. This circuit is protected by a 15 amp fuse located in cavity 11 of the Power Distribution Center
(PDC). The F41 circuit is also spliced internal to the junction block and supplies power to the coil and contact sides of the courtesy lamp relay
Ground for the lamp is controlled by the Body Control Module (BCM) on circuit M51. The BCM provides a ground path for circuit M51 when
any door is opened and the ignition switch is in the OFF position.
The BCM uses the door ajar switches for it's input. Circuit G75 is used for the left front door. Circuit G74 is used for the right front door. These
switches are normally OPEN with the doors closed and case grounded.
The BCM also momtors the amount of time the door is OPEN and will turn OFF the lamp after an extended period of time (15 min). This is to
prevent excessive battery draw.
