Chevrolet Trax: DTC B1020: Auxiliary electronic control unit (ecu) performance
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptor
DTC B1020 00
Auxiliary Electronic Control Unit (ECU) Performance
Circuit/System Description
The radio communicates with the radio controls via serial data. This DTC
indicates a fault in the radio controls.
The radio may continue to respond normally to faceplate functions when this DTC
is set.
Conditions for Running the DTC
- Ignition is ON or in the ACC position.
- The system voltage is at least 9.5 V and no more than 15.5 V.
- 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 in the radio controls.
Action Taken when the DTC Sets
No action is taken.
Conditions for Clearing the DTC
- A current DTC clears when the radio receives a proper status response
message back from the radio
control assembly.
- A history DTC clears after 50 malfunction-free ignition cycles.
Diagnostic Aids
- This DTC may be stored as a history DTC without affecting the operation
of the radio controls.
- If stored only as a history DTC and not retrieved as a current DTC, do
not replace the radio controls.
- If this DTC is retrieved as both a current and history DTC, replace the
radio controls.
Reference Information
Schematic Reference
Radio/Navigation System Schematics (Encore), Radio/Navigation System
Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Radio/Audio System Description and Operation (with Monochrome Display),
Radio/Audio System
Description and Operation (with Color Display)
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON.
- Verify DTC B1020 is not set.
If DTC B1020 is set
Replace the A22 Radio Controls.
If DTC B1020 is not set
All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for radio controls replacement, programming, and setup.
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category
DTC Descriptors
DT
Special Tools
EN-470-B Angular Torque Wrench
GE-571-B Dial Gauge
For equivalent regional tools, refer to Special Tools.
Crankshaft End Play, Check
Fig. 358: Gauge Tool
NOTE: Crankshaft attached with crankshaft bearing caps.
Install the GE-571-B gauge (1).
Install the holder on the front o