For 1990-2009 cars

## DTC P0575 3.6L (LY7)

### Circuit Description

The body control module (BCM) detects a predetermined voltage signal when any cruise control switch function is activated. The BCM sends a group of GMLAN serial data message to the ECM, indicating this function has been requested.

### DTC Descriptor

This diagnostic procedure supports the following DTCs:

DTC P0575 Cruise Control Switch Signal Circuit

### Conditions for Running the DTC

• | LAN bus has been initialized and ready for use.

• | It is 3 seconds after ignition.

• | Ignition 1 voltage is between 10.5-18 volts.

• | Normal bus communication is going on.

• | Once the above conditions are reached for 10 seconds, DTC P0575 will run continuously.

### Conditions for Setting the DTC

• | The ECM receives an invalid cruise control switch status GMLAN serial data message from the BCM.

• | The diagnosis runs continuously.

• | It lasts for 4 seconds. The above conditions last for 4 seconds.

### Actions Taken When DTC sets

• | The Cruise Control System is switched off.

• | The ECM stores the DTC information into memory when the diagnostic runs and fails.

• | The Malfunction Indicator Lamp (MIL) does not illuminate.

• | The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.

### Conditions for Clearing the MIL/DTC

• | A last test failed, or the current DTC, clears when the diagnosis 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.

• | Clear the MIL/DTC with a 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.

If this DTC is retrieved as both a current and a history DTC, replace the BCM.

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Cruise Control Schematics Connector End View Reference: Cruise Control Connector End Views
1 | Have you conducted Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Does ECM DTC P0575 set as a current DTC? | 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. | Go to Step 4 | --
4 |

1. Clear away all DTCs with scan tool.
2. Operate the vehicle according to the conditions for running the DTC.

Is there any DTC set again?

Go to Step 2

System OK

## DTC P0575 4.6L (LH2)

### Circuit Description

The body control module (BCM) detects a predetermined voltage signal when any cruise control switch function is activated. The BCM sends a group of GMLAN serial data message to the ECM, indicating this function has been requested.

### DTC Descriptor

This diagnostic procedure supports the following DTCs:

DTC P0575 Cruise Control Switch Signal Circuit

### Conditions for Running the DTC

• | LAN bus has been initialized and ready for use.

• | It is 3 seconds after ignition.

• | Ignition 1 voltage is between 10.5-18 volts.

• | Normal bus communication is going on.

• | Once the above conditions are reached for 10 seconds, DTC P0575 will run continuously.

### Conditions for Setting the DTC

• | The ECM receives an invalid cruise control switch status GMLAN serial data message from the BCM.

• | The diagnosis runs continuously.

• | It lasts for 4 seconds. The above conditions last for 4 seconds.

### Actions Taken When DTC sets

• | The Cruise Control System is switched off.

• | The ECM stores the DTC information into memory when the diagnostic runs and fails.

• | The Malfunction Indicator Lamp (MIL) does not illuminate.

• | The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.

### Conditions for Clearing the MIL/DTC

• | A last test failed, or the current DTC, clears when the diagnosis 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.

• | Clear the MIL/DTC with a 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.

If this DTC is retrieved as both a current and a history DTC, replace the BCM.

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Cruise Control Schematics Connector End View Reference: Cruise Control Connector End Views
1 | Have you conducted Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Does ECM DTC P0575 set as a current DTC? | 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. | Go to Step 4 | --
4 |

1. 1. Clear away all DTCs with scan tool.
2. 2. Operate the vehicle according to the conditions for running the DTC.

Is there any DTC set again?

Go to Step 6

System OK

5 | Replace the electronic brake control module (EBCM). Refer to Control Module References to replace, set and program. Is the replacement completed? | Go to Step 2 | --
6 |

1. Clear away all DTCs with scan tool.
2. Operate the vehicle in the Conditions for Running the DTC.

Is there any DTC set again?

Go to Step 2

System OK