2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3267

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3267

Circuit/System Description

The driver door module (DDM) and the front passenger door module (FPDM) communicate with window regulator motors on the local

interconnect network bus 1 and the local interconnect network bus 2 circuits respectively. When the driver power window switch is activated to a

desired position, the DDM examines the request and checks for messages from other vehicle control modules prohibiting window movement. If no

prohibitive messages have been received, the DDM will send a LIN serial data message to the driver door window motor to move the window to

the desired position.

When the DDM receives a request to operate one of the right side passenger windows from the driver master control, a GMLAN serial data

message is sent to the PDM. The PDM examines the request and checks for messages from other vehicle control modules prohibiting the window

movement. If no prohibitive messages have been received, the PDM will send a LIN serial data message to the appropriate window motor to move

the window as requested.

The DDM and PDM supply their respective rear power window switches with a 12 V reference and signal circuit. The rear power window switches

contain separate resistors for each switch position. When a rear power window switch is activated, the associated door control module interprets the

signal and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been

received, the door control module sends a LIN serial data message to the appropriate power window motor commanding the requested window

position.

The driver information center (DIC) displays the compass based on serial data message from the BCM. The compass module communicates with

the body control module (BCM) through a bi-directional data circuit (LIN).

Conditions for Running the DTC

The system voltage is between 9-16 V.

Conditions for Setting the DTC

U1500 01

When there is a short to voltage in the local interconnect network bus circuit.

U1500 02

When there is a short to ground in the local interconnect network bus circuit.

U1500 31

The module has detected an internal malfunction.

U1511, U1512

The DTC will set when there is an open/high resistance in the local interconnect network bus circuit, or an open in the voltage or ground circuits of

the motor or module.

Action Taken When the DTC Sets

U1500

The individual LIN bus will be inoperative, disabling all windows on one side of the vehicle.

U1500 31

The module refuses all additional inputs.