Dome Lamp: Description and Operation

CIRCUIT OPERATION
The dome lamp receives power from the 10 amp fuse located in the junction block on the M11 circuit. This fuse is the Ignition-Off-Draw (IOD) fuse and is located in cavity 5. This circuit is HOT at all times. The ground path for the lamps is provided in two different ways.

One way is through the Body Control Module (BCM) and the door ajar switches. Circuit M2 is connected between the ground side of the dome lamp and the BCM. When the door is OPENED, the door ajar switch CLOSES completing a path to ground. The BCM then process this information and grounds the M2 circuit.

The second ground path is through the dome lamp switch. When the operator turns the switch to the ON position, a ground path is provided through the switch on the Z1 circuit. This ground terminates at the instrument panel left side cowl after passing through the ground joint in the junction block.