For 1990-2009 cars only
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 Unit (ECU) PerformanceDTC B1020 39:: Auxiliary Electronic Unit (ECU) Performance Internal Electronic Failure
Circuit/System Description
The navigation module performs a self test to detect an internal malfunction.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
An internal navigation module malfunction exists.
Action Taken When the DTC Sets
Navigation system fails to operate.
Reference Information
Schematic Reference
Radio/Navigation System Schematics
Connector End View Reference
Description and Operation
Navigation System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present. |
| • | A history DTC clears after 50 fault-free ignition cycles. |
Circuit/System Verification
1. Verify DTC B1020 is not set.
| ⇒ | If the DTC is set, replace the navigation module. |
Repair Instructions
Perform the Diagnostic Repair Verification.
Control Module References for navigation module replacement, setup, and programming.
