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 Descriptors
DTC C0186 00: Replace Lateral Acceleration SensorDTC C0186 5A: Lateral Acceleration Sensor Plausibility Error
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Lateral Accelerometer Supply Voltage Circuit | C0186 00 | C0186 00 | C0186 00 | -- |
Lateral Accelerometer CAN Bus High Circuit | C0186 00 | C0186 00 | C0186 00 | C0186 5A |
Lateral Accelerometer CAN Bus Low Circuit | C0186 00 | C0186 00 | C0186 00 | C0186 5A |
Lateral Accelerometer Ground Circuit | -- | C0186 00 | -- | -- |
Circuit/System Description
The lateral accelerometer and the yaw rate sensors are combined into one sensor external to the electronic brake control module (EBCM). The electronic stability program (ESP) uses the lateral accelerometer input when calculating the desired yaw rate.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | Ignition voltage is greater than 8 volts. |
Conditions for Setting the DTC
| • | The yaw rate sensor/lateral accelerometer fails an internal self test. |
| • | Communication is lost between the EBCM and the yaw rate sensor/lateral accelerometer. |
Action Taken When the DTC Sets
| • | The EBCM disables the Traction Control System (TCS)/Electronic Stability Control (ESP)/Electronic Brake Distribution (EBD) for the duration of the ignition cycle. |
| • | The multi function display (MFD) displays the Traction Ctrl Off message. |
| • | The multi function display (MFD) displays the Stability Ctrl Off message. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
| • | The DTC can be cleared using a scan tool. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
With scan tool installed, clear the DTCs then drive the vehicle in a straight line at a speed greater than 20 km/h (13 mph). If the DTC did not set as a current DTC see diagnostic aids.
Circuit/System Testing
- Ignition OFF, disconnect the yaw rate sensor/lateral accelerometer connector.
- Test the yaw rate sensor/lateral accelerometer reference voltage circuit for a short to voltage, short to ground, an open or high resistance.
- Test the yaw rate sensor/lateral accelerometer ground circuit for an open or high resistance.
- Ignition ON, test the yaw rate sensor/lateral accelerometer reference voltage circuit for 5 volts, and the ground circuit for an open or high resistance.
| ⇒ | If the reference voltage circuit does not test normal, repair the circuit. |
| ⇒ | If the reference ground circuit does not test normal, repair the circuit. |
| ⇒ | If the yaw/later 5 volt reference and ground circuits test normal replace the yaw rate sensor/lateral accelerometer. |
Repair Verification
| • | Perform the Diagnostic Repair Verification after completing the diagnostic procedure. |
