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 B0997 00: Auxiliary Electronic Control Unit (ECU) 2 PerformanceCircuit/System Description
The navigation radio communicates with the navigation display via serial data. If the navigation radio receives an improper status response message, DTC B0997 will set.
Conditions for Running the DTC
| • | The ignition is in the RUN or ACC position. |
| • | The system voltage is greater than 9.5 volts and less than 15.5 volts. |
| • | All the above conditions are present for greater than 10 seconds. |
Conditions for Setting the DTC
The navigation radio receives an improper status response message back from the navigation display assembly.
Action Taken when the DTC Sets
No action is taken.
Conditions for Clearing the DTC
| • | A current DTC clears when the navigation radio receives the proper response message 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
Description and Operation
Radio/Audio System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Verify that DTC B0997 is not set.
| ⇒ | If the DTC is set, replace the navigation display assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Radio, Video, Audio Disc Player, and Navigation Information Display Replacement
