2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 2980
* Accessory DC power control module terminal 2 and drive motor generator power inverter module terminal 25
瀚慖f greater than the specified value, test the serial data circuits for an open/high resistance.
8. Test for infinte resistance between the accessory DC power control module terminal 2 and accessory DC power control module terminal 1.
瀚慖f less than the specified value, test the serial data circuits for a short between the circuits.
9. If all circuits test normal, replace the accessory DC power control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* GMLAN Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Wiring Repairs/GMLAN Wiring Repairs)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming
U1826
DTC U1826
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 Descriptors
DTC U1826 71
- Lost Communication With Multi-Axis Acceleration Sensor Module on Bus "B" Invalid Data
DTC U1826 72
- Lost Communication With Multi-Axis Acceleration Sensor Module on Bus "B" Message Counter Incorrect
DTC U1826 7F
- Lost Communication With Multi-Axis Acceleration Sensor Module on Bus "B" Bus Signal Erratic
Diagnostic Fault Information
Circuit/System Description
The electronic brake control module (EBCM) activates the other control modules connected to the CAN serial data circuits by applying voltage
when the ignition key is in ACC, ON or START. The EBCM and Yaw and Lateral Accelerometer Sensor are connected to the CAN bus serial data
circuits. For more information on CAN bus serial data refer to Data Link Communications Description and Operation (See: Powertrain
Management/Computers and Control Systems/Information Bus/Description and Operation).
Conditions for Running the DTC
* The system voltage is between 9-16 V.
* The vehicle power mode master requires serial data communication to occur.
Conditions for Setting the DTC
