2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3297
* GMLAN Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Wiring Repairs/GMLAN Wiring Repairs)
* Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement ()
* Control Module References (See: Testing and Inspection/Programming and Relearning)for control module replacement, setup, and
programming
U1829
DTC U1829
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC U1829 00
- Lost Communication with Gateway A on Bus B
Diagnostic Fault Information
Circuit/System Description
Control modules connected to the high and low speed GMLAN serial data circuits monitor for serial data communications during normal vehicle
operation. Operating information and commands are exchanged among the control modules. The control modules have prerecorded information
about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some
periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification
number of the transmitter module.
The serial data gateway module (SDGM) energizes the wake up signal to activate the accessory DC power control module (APM) and another
wake up signal to activate the hybrid powertrain control module (HPCM) which is inside the drive motor generator power inverter module (PIM)
when communication is needed. The HPCM reports all DTCs for the APM.
Conditions for Running the DTC
* The system voltage is between 9-16 V.
* The ignition in RUN.
Conditions for Setting the DTC
The powertrain serial data circuits between the SDGM and the APM or the PIM are open.
Action Taken When the DTC Sets
The control modules is never signaled, therefore the specific subsystems may not function. Depending on the fault, the MIL, battery indicator may
illuminate and several DIC messages may be present.
Conditions for Clearing the DTC
