2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 640

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 640

Circuit/System Description

Voltage for the courtesy lamps is supplied from body control module (BCM), driver door switch, and passenger door switch. When a door is

opened, a signal is applied to the door module. The door module then applies a message on the low speed serial data communication circuit to the

BCM to activate the courtesy lamps. The BCM then applies voltage to the courtesy lamps voltage supply circuit and the components on that circuit.

Conditions for Running the DTC

* Battery Voltage must be between 9-16 V.

* The ignition is ON.

* The BCM, driver door switch, and passenger door switch attempt to illuminate the courtesy lamps.

Conditions for Setting the DTC

The BCM, driver door switch, or passenger door switch detect a short to ground, short to voltage, or open on the courtesy lamp voltage supply

circuit.

Action Taken When the DTC Sets

The BCM, driver door switch, and passenger door switch cease attempts to illuminate the courtesy lamps.

Conditions for Clearing the DTC

* The conditions for setting the DTC are no longer present.

* A history DTC clears after 100 malfunction-free ignition cycles.

* The BCM receives the clear code command from the scan tool.