B1020

DTC B1020

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B1020 39:

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Auxiliary Electronic Unit (ECU) Performance Internal Electronic Failure

Circuit/System Description

The radio communicates with the radio/HVAC control assembly via serial data. This DTC indicates a fault in the Bluetooth hardware in the radio/HVAC control assembly. No external circuits are involved.

Conditions for Running the DTC

* Ignition is ON or in the ACC position

* The system voltage is 9-16 V

* The test is run once during radio wake up

Conditions for Setting the DTC

A message is received from the Bluetooth component that indicates initialization failure.

Action Taken When the DTC Sets

* Bluetooth features will be inoperative

* An error message will be displayed if the phone or Bluetooth media are selected from the menu

Conditions for Clearing the DTC

* A message is received from the Bluetooth component that indicates successful initialization during radio wake up.

* A history DTC clears after 50 fault-free ignition cycles.

Diagnostic Aids

* This DTC may be stored as a history DTC without affecting the operation of the radio/HVAC control assembly.

* If stored only as a history DTC and not retrieved as a current DTC, do not replace the radio/HVAC control assembly.

* If this DTC is retrieved as both a current and history DTC, replace the radio/HVAC control assembly.

Reference Information

Schematic Reference

Radio/Navigation System Schematics Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Radio/Audio System Description and Operation Radio/Audio System

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

If this DTC is retrieved as a current DTC, replace the radio/HVAC control.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests.

Radio Control Assembly Replacement Radio Control Assembly Replacement