GM Service Manual Online
For 1990-2009 cars only

DTC B101D Radio

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 B101D 33: ECU Hardware Performance Special Memory Failure

DTC B101D 34: ECU Hardware Performance RAM Failure

DTC B101D 36: ECU Hardware Performance EEPROM Failure

Circuit/System Description

When the ignition is turned ON, the radio performs a self test to verify if any critical malfunction exists within the system.

Conditions for Running the DTC

This DTC runs continuously

Conditions for Setting the DTC

The module has detected an internal electrical malfunction.

Action Taken When the DTC Sets

Radio functions are disabled

Conditions for Clearing the DTC

    • A current DTC clears when the conditions for setting the DTC are no longer present.
    • 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 B101D is not set.

If the DTC is set, replace the radio.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio replacement, setup, and programming

DTC B101D Navigation Module

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 B101D 33: ECU Hardware Performance Special Memory Failure

DTC B101D 34: ECU Hardware Performance RAM Failure

DTC B101D 36: ECU Hardware Performance EEPROM Failure

Circuit/System Description

When the ignition is turned ON, the navigation interface module (NIM) performs a self test to verify if any critical malfunction exists within the system.

Conditions for Running the DTC

This DTC runs continuously

Conditions for Setting the DTC

The module has detected an internal electrical malfunction.

Action Taken When the DTC Sets

This code will set as current when the NIM recognises an internal fault or fails to communicate with the BCM.

Conditions for Clearing the DTC

    • A current DTC clears when the conditions for setting the DTC are no longer present.
    • 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

Navigation 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 B101D is not set.

If the DTC is set, replace the navigation interface module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for navigation interface module replacement, setup, and programming