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 C0252 00: Vehicle Stability Control Module Sensors Correlation Malfunction

### Circuit/System Description

The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one multi-axis sensor, external to the electronic brake control module (EBCM). The EBCM controls the stability control by monitoring the inputs of the yaw rate sensor, lateral acceleration sensor, and steering angle sensor. The readings are compared to an internal calibrated value so it knows if the vehicle is having an instability condition to activate the stability control.

### Conditions for Running the DTC

Vehicle is travelling

### Conditions for Setting the DTC

The yaw rate sensor, lateral acceleration sensor and steering angle sensor signals are not plausible to each other. Straight line driving can not be recognized after a distance of 2.5 km (1.5 mi).

### Action Taken When the DTC Sets

• | The EBCM disables the stability control and hill start assist for the duration of the ignition cycle.

• | The traction control/stability control-active indicator turns ON.

### Conditions for Clearing the DTC

• | A current DTC clears when the diagnostic runs and passes.

• | The EBCM will turn OFF the indicator in the next ignition cycle.

### Diagnostic Aids

The following conditions can cause this concern:

• | Improper steering alignment

• | An improperly mounted or loose multi-axis sensor

### Reference Information

#### Schematic Reference

) Antilock Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

ABS 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

• | Ignition ON, observe the scan tool Lateral Acceleration Signal and Yaw Rate Sensor parameter. On a level surface, the readings should be 0 V.

• | Observe the scan tool Steering Column Position parameter. As the steering wheel is turned, the reading should travel between -450 and 450°.

### Circuit/System Testing

1. Verify that DTC C0187, C0196, C019B, C0297, or C0710 is not present.

⇒ | If any of the listed DTCs is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle to diagnose that DTC prior to this diagnostic.

2. Replace the B119 Yaw and Lateral Accelerometer Sensor and verify the DTC does not reset.

⇒ | If the DTC resets, replace the B99 Steering Angle Sensor and verify the DTC does not reset.

3. If the DTC resets, replace the K17 Electronic Brake Control Module (EBCM).

### Repair Instructions

• | Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Vehicle Yaw Sensor Replacement

• | Steering Wheel Position Sensor Replacement

• | Control Module References for EBCM replacement, setup and programming