Roof Rail Courtesy/Reading Lamps

The operation of these lamps is described as part of the courtesy lights operation. The Body Control Module (BCM) provides power (circuit 1732) and ground (circuit 157) to these lamps, controlling their operation.

In addition, these lamps have switches that allow the operator to turn them on when the courtesy lights are off. The switches, when on, provide ground to these lamps, turning them on. The switches obtain ground through circuit 850. Power to these lamps is provided by the BCM through circuit 1732, so that they are protected by the inadvertent load (battery rundown) protection in case they are left on.