B0560

DTC B0560

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 B0560 08
- Tachometer Circuit Signal Invalid

Circuit/System Description

The amplifier receives a discrete engine speed signal from the engine control module. The high signal circuit is a pulse-width modulated signal from the engine control module. The low signal circuit provides a ground reference for the amplifier. The amplifier uses the engine RPM signal and the inputs from three headliner mounted microphones to determine the frequency of undesirable engine sounds in the vehicle cabin.

Conditions for Running the DTC

* Engine running, Radio ON
* Battery voltage between 9-16 volts.

Conditions for Setting the DTC

* The amplifier receives a serial data message that the engine is running.
* The discrete engine speed signal to the amplifier indicates the engine speed is less than 300 RPM or greater than 9000 RPM.

Action Taken When the DTC Sets

The active noise cancellation system is disabled.

Conditions for Clearing the DTC

* A current DTC clears when a valid engine speed signal between 300-9000 RPM is received.
* A history DTC clears when the ignition cycle counter reaches the reset threshold without a repeat of the malfunction.

Reference Information
Schematic Reference

Active Noise Cancellation Schematics Active Noise Cancellation Schematics
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

Active Noise Cancellation Description and Operation Active Noise Cancellation
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 Programming and Relearning for scan tool information

Circuit/System Testing

Note: Diagnose any engine control module DTCs before performing this diagnostic.

1. Ignition OFF, disconnect the X4 harness connector at the amplifier.
2. Test for less than 10 ohm between the engine speed low signal circuit terminal 8 and ground.

• If not within the specified range, test the circuit for an open/high resistance, or short to voltage. If the circuit tests normal replace the ECM.

3. Engine running at 600 RPM, test for 275-325 Hz AC between the engine speed high signal circuit terminal 7 and ground.

• If not within the specified range, test the circuit for a short to ground, open/high resistance, or short to voltage. If the circuit tests normal replace the ECM.

4. If all circuits test normal, replace the amplifier.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Programming and Relearningfor amplifier or ECM replacement, setup, and programming