For 1990-2009 cars

### Circuit Description

The EBCM must be programmed with one of four selectable trim levels when a new EBCM is installed in the vehicle. A scan tool must be used to perform this function.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

The EBCM has not been programmed with a valid trim level.

### Action Taken When the DTC Sets

• | The EBCM disables the ABS.

• | The ABS indicator turns ON.

### Conditions for Clearing the DTC

The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.

### Diagnostic Aids

Replace the EBCM if DTC C0279 continues to set intermittently.

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform the ABS Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - ABS
2 |

1. Use a scan tool in order to clear the DTCs.
2. Turn OFF the ignition for 5 seconds.
3. Turn ON the ignition and wait 10 seconds.

Does the DTC set?

Go to Step 3

Go to Diagnostics Aids

3 | Use the scan tool in order to verify the trim level and tire size calibrations of the EBCM are valid and correspond with the vehicle specified. Use the scan tool in order to perform the Tire Size Calibration procedure and/or the Trim Level Calibration procedure, if necessary.

Did you find and correct the condition?

Go to Step 5

Go to Step 4

4 | Important: Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure and the Trim Level Calibration procedure. Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the replacement? | Go to Step 5 | --
5 |

1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 3

System OK