Caravan FWD L4-2.4L VIN X (1997)
Door Lamp: Description and Operation
CIRCUIT OPERATION
Power for the lamps is supplied on circuit M11. This circuit is HOT when the contact side of the courtesy lamp relay is CLOSED.
Power for the coil and contacts sides of the courtesy lamp relay is supplied on circuit F41. This circuit is protected by a 15 amp fuse located in
cavity 11 of the Power Distribution Center (PDC).
Ground for the coil side of the relay is controlled by the Body Control Module (BCM). The BCM determines the need for the relay to be activated
based on inputs received from the door and liftgate switches.
Circuit G75 provides the input to the BCM from the left front door ajar switch, the switch is case grounded.
Circuit G74 provides the input to the BCM from the right front door ajar switch, the switch is case grounded.
Circuit G76 provides the input to the BCM from the right rear door ajar switch. Ground for the switch is supplied on circuit Z1 and terminates at
the rear body ground.
Circuit G77 provides the input to the BCM from the left rear door ajar switch. Ground for the switch is supplied on circuit Z1 and terminates at the
rear body ground.
Circuit G78 provides the input to the BCM from the liftgate ajar switch. Ground for the switch is supplied on circuit Z1, and terminates at the
liftgate ground.
When the contacts in the relay CLOSE, circuits F41 and M11 are connected. Circuit M11 connects from the relay to the left and right door lamps.
Ground for the lamps is supplied on circuit Z1.
An additional input to the BCM is provided on circuit M112. This circuit connects from the headlamp switch to the BCM. It is used to supply a
ground path for the coil side of the courtesy lamp relay when the operator has moved the courtesy lamp switch to the ON position.
