2010 Cadillac CTS Sedan AWD V6-3.6L Page 292
Liftgate Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Liftgate Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Liftgate Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Description and Operation/Liftgate
Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Testing
Perform the Liftgate Calibration (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Testing and Inspection/Programming and
Relearning). The liftgate module should learn the travel limits, exit the calibration mode, and B1019 00 will become a history code.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning)for LGM replacement, setup and programming
B1020
DTC B1020
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 B1020 00
- Auxiliary Electronic Control Unit (ECU) 1 Performance
Circuit/System Description
The navigation radio communicates with the radio control assembly via serial data. If the radio receives an improper status response message, DTC
B1020 will set.
This DTC indicates an internal ECU fault or a stuck button on the faceplate. No external circuits are involved.
Conditions for Running the DTC
* Ignition is ON or in the ACC position.
* The system voltage is at least 9.5 volts and no more than 15.5 volts.
* All the above conditions are present for greater than 10 seconds.
Conditions for Setting the DTC
The radio receives an improper status response indicating an internal ECU fault or a stuck button on the radio control assembly.
Action Taken when the DTC Sets
