Circuit Operation

CIRCUIT OPERATION
The dome lamp receives power from the 10 Amp fuse located in the Power Distribution Center on the M1 circuit. This circuit is HOT at all times and the Ignition-Off Draw (IOD) fuse. The ground path for the lamp is provided in two different ways.

One way is through the door ajar switches and the time out relay. Circuit M2 connects to all the door ajar switches from the time out relay. The switches are case-grounded to the body When a door is OPENED, the plunger in the switch CLOSES, completing a path to ground.

The second ground path is through the headlamp switch. Circuit M23 is spliced in with the time out relay When the operator turns the headlamp switch to the dome lamp ON position, a ground path is provided through the switch on the Z1 circuit. This ground terminates at the instrument panel left center support.

On vehicles equipped with Remote Keyless Entry (RKE) the M23 circuit is spliced to the RKE module. This allows the lamp to be turned ON when a valid signal is received by the RKE module from the transmitter.