GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    â€¢ Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    â€¢ Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    â€¢  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0575: Cruise Control Switch Signal Circuit

Circuit/System Description

When a cruise control function switch is applied, the body control module (BCM) detects a predetermined voltage signal on the cruise control set/coast and resume/accelerate switch signal circuit. The BCM sends a GMLAN serial data message to the engine control module (ECM) indicating that the function has been requested.

Conditions for Setting the DTC

    â€¢ The ECM receives an invalid cruise control switch status GMLAN serial data message from the BCM.
    â€¢ This diagnostic runs continuously.

Action Taken When the DTC Sets

    â€¢ The Cruise Control System is disabled.
    â€¢ The ECM stores the DTC information into memory when this diagnostic runs and fails.
    â€¢ The malfunction indicator lamp (MIL) will not illuminate.
    â€¢ The ECM records the operating conditions at the time that this diagnostic fails. The ECM stores this information in the Failure Records.
    â€¢ All of the scan tool cruise control function switch parameters are set to Off.

Conditions for Clearing the DTC

    â€¢ A last test failed, or the current DTC, clears when the diagnostic runs and does not fail.
    â€¢ A history DTC clears after 40 consecutive warm-up cycles, if failures are not reported by this or any other emission related diagnostic.
    â€¢ Use the scan tool in order to clear the DTC.

Reference Information

Schematic Reference

Cruise Control Schematics

Connector End View Reference

Data Communication Connector End Views

Electrical Information Reference

    â€¢  Circuit Testing
    â€¢  Connector Repairs
    â€¢  Testing for Intermittent Conditions and Poor Connections
    â€¢  Wiring Repairs

Circuit/System Testing

Important: Fix any Cruise Control System related DTCs before using this diagnostic.

Important: This DTC may be stored as a history DTC without affecting the operation of the BCM. Do not replace the BCM if this DTC is stored only as a history DTC and is not retrieved as a current DTC.

Ignition ON, verify DTC P0575 is not current in the ECM.

⇒If DTC P0575 is current, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming