Diagnostic Instructions
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
| • | 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 this diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The ECM records the operating conditions at the time that this diagnostic fails. The ECM stores this information in the Failure Records. |
| • | All of the scan tool cruise control function switch parameters 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. |
Reference Information
Schematic Reference
Cruise Control Schematics
Connector End View Reference
Data Communication Connector End Views
Electrical Information Reference
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
Diagnostic Instructions
DTC Descriptor
DTC P0575 00: Cruise Control Switch Signal Circuit
Circuit/System 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.
Conditions for Running the DTC
The ignition 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
| • | The DTC becomes history when the conditions for setting the DTC are no longer present. |
| • | The history DTC clears after 40 consecutive warm-up cycles. |
| • | The ECM receives a clear code command from the scan tool. |
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 or ECM. |
| • | Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine
how many ignition cycles that the diagnostic test reported a pass and/or a fail. |
Reference Information
Schematic Reference
Cruise Control Schematics
Connector End View Reference
Data Communication Connector End Views
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List
Circuit/System Verification
Important: Verify that B3794 is not set as current or history before performing this diagnostic. If B3794 is set as current or history, refer to
DTC B3794
.
Ignition ON, observe the scan tool Cruise Control Switch parameter while pressing the cruise control switch ON and OFF. The reading should change between ON and OFF.
| ⇒ | If the parameter does not switch between ON and OFF, replace the BCM. |
Circuit/System Testing
Ignition ON, verify that DTC P0575 is stored in the ECM.
| ⇒ | If the DTC is stored as a current DTC, replace the ECM. |
| ⇒ | If the DTC is stored only as a history DTC, refer to Diagnostic Aids. Do not replace the ECM or BCM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for BCM or ECM replacement, setup, and programming
