PRE-RELEASE
DTC B1020
| DTC B1020 |
| 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 Malfunction
| Circuit/System Description |
The navigation radio communicates with the radio display assembly via serial data. If the radio receives an improper status response message, DTC B1020 will set.
This DTC indicates an fault in the display. No external circuits are involved.
| Conditions for Running the DTC |
| • |
Ignition is ON or in the ACCESSORY position.
|
|
| • |
The system voltage is between 9.5-15.5 V.
|
|
| • |
All the above conditions are present for greater than 10 s.
|
|
| Conditions for Setting the DTC |
The radio receives an improper status response indicating an internal electronic control unit fault or a stuck button in the radio display assembly.
| 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.
|
|
| Reference Information |
Schematic Reference
Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Radio/Audio System Description and Operation
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 |
Verify that DTC B1020 is not set.
| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
