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 Switch Signal Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
B+ | 1 | 1 | -- | --
Cruise Control Switch Signal | 1 | 1 | P0575 | --
1. Cruise Control Malfunction

### Circuit/System Description

The cruise control switch is an input to the engine control module (ECM). The ECM monitors the cruise control set/coast and resume/accelerate switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The ECM detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

The ECM detects an invalid voltage signal on the cruise control switch signal circuit.

### Actions Taken When the DTC Sets

The cruise control system is disabled.

### Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

### Reference Information

#### Schematic Reference

Cruise Control Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Cruise Control Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

1. Ignition ON, observe the Cruise On/Off switch parameter. The reading should be Off and change to On when the switch is pressed.
2. Observe the Cruise Set/Coast Switch parameter. The reading should be Inactive and change to Active when the switch is pressed.
3. Observe the Cruise Resume/Accel. Switch parameter. The reading should be Inactive and change to Active when the switch is pressed.

### Circuit/System Testing

1. Ignition OFF, disconnect the cruise control switch connector.
2. Ignition ON, Verify the cruise control switch parameters are Off or Inactive.

⇒ | If not the specified values test the switch signal circuit for a short to voltage. If the circuit tests normal replace the ECM.

3. If all circuits test normal replace the cruise control switch.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Cruise Control Switch Replacement

• | Control Module References for BCM or ECM replacement, setup, and programming