For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P0575: Cruise Control Switch Signal CircuitCircuit/System Description
When a cruise control function switch is activated, the body control module (BCM) detects a predetermined voltage signal. The BCM sends a serial data message to the engine control module (ECM) indicating the function that has been requested.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
| • | The ECM receives an invalid cruise control switch status serial data message from the BCM. |
| • | This diagnostic runs continuously. |
Actions Taken When the DTC Sets
| • | The cruise control system is disabled. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear after 40 malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Cruise Control Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Verify that DTC B3794 is not set.
- Road test the vehicle and attempt to engage cruise. Verify that cruise control engages properly and the DTC P0575 is not set.
| ⇒ | If DTC is set, refer to DTC B3794 |
| ⇒ | If DTC resets, replace the K9 BCM. Clear the DTC, road test the vehicle and attempt to engage cruise. If the DTC resets, replace the K20 ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM or ECM replacement, setup, and programming
