GM Service Manual Online
For 1990-2009 cars only

Circuit Description

When a cruise control function switch is activated, the body control module (BCM) detects a predetermined voltage signal. The BCM sends a GMLAN serial data message to the engine control module (ECM) indicating the function that has been requested.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0575 Cruise Control Switch Signal Circuit

Conditions for Running the DTC

The engine is ON.

Conditions for Setting the DTC

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

Action Taken When the DTC Sets

    • The Cruise Control System is disabled.
    • The ECM stores the DTC information into memory when the diagnostic runs and fails.
    • The malfunction indicator lamp (MIL) will not illuminate.
    • The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.
    • All cruise control function switches are set to OFF.

Conditions for Clearing the DTC

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

Diagnostic Aids

    • This DTC may be stored as a history DTC without affecting the operation of the BCM. If stored only as a history DTC and not retrieved as a current DTC, do not replace the BCM.
    • If this DTC is retrieved as both a current and history DTC, replace the BCM.

Step

Action

Yes

No

Schematic Reference: Cruise Control Schematics

Connector End View Reference: Computer/Integrating Systems Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Is DTC P0575 current in the engine control module (ECM)?

Go to Step 3

Go to Diagnostic Aids

3

Replace the body control module (BCM). Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 4

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4

  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.

Does the DTC reset?

Go to Step 2

System OK