2010 Cadillac Truck SRX FWD V6-3.0L Page 430

2010 Cadillac Truck SRX FWD V6-3.0L Page 430

DTC Descriptor

DTC B1020 00

- Auxiliary Electronic Control Unit (ECU) Performance

Circuit/System Description

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

are involved. The radio may continue to respond normally to faceplate functions when this DTC is set.

Conditions for Running the DTC

* Ignition is ON or in the ACC position.

* The system voltage is at least 9.5 V and no more than 15.5 V.

* All the above conditions are present for greater than 10 seconds.

Conditions for Setting the DTC

The radio receives an improper status response indicating an internal ECU fault in the radio/HVAC control.

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.

Diagnostic Aids

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

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

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

Reference Information

Schematic Reference

Radio/Navigation System Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System

Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Radio/Audio System Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Radio/Audio System)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) 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 (See: Verification Tests) after completing the diagnostic procedure.