For 1990-2009 cars

### 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 Enable Circuit Malfunction

### 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

DTC P0575 is a type A DTC.

### Conditions for Clearing the MIL/DTC

DTC P0575 is a type A DTC.

### Diagnostic Aids

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

• | Body Control System Schematics

• | Steering Wheel Secondary/Configurable Control Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References

### Circuit/System Verification

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.

### Circuit/System Testing

Ignition ON, verify that DTC P0575 is current in the ECM.

• | If the DTC is stored as a current DTC, replace the BCM.

• | If the DTC is stored only as a history DTC, refer to Diagnostic Aids. Do not replace the BCM.

### Repair Instructions

Perform the Diagnostic Repair Verification .

Control Module References .