2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 2952
DTC U1511 00
- Inter-device Dedicated Bus Lost Communication With Device 1
DTC U1512 00
- Inter-device Dedicated Bus Lost Communication With Device 2
Diagnostic Fault Information
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
