C0186

DTC C0186 or C0196

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (with HP2) (Initial Inspection and Diagnostic Overview)Diagnostic System Check - Vehicle (without HP2) (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptors
DTC C0186 00
- Lateral Accelerometer Circuit

DTC C0186 09
- Lateral Accelerometer Rate of Change Above Threshold

DTC C0186 11
- Lateral Accelerometer Circuit Above Maximum Threshold

DTC C0186 18
- Lateral Accelerometer Circuit Signal Amplitude Less Than Minimum

DTC C0186 0A
- Lateral Accelerometer Circuit Rate of Change Below Threshold

DTC C0186 4B
- Lateral Accelerometer Circuit Calibration Not Learned

DTC C0196 00
- Yaw Rate Circuit

DTC C0196 0A
- Yaw Rate Circuit Rate of Change Below Threshold

DTC C0196 09
- Yaw Rate Circuit Rate of Change Above Threshold

DTC C0196 11
- Yaw Rate Circuit Above Maximum Threshold

DTC C0196 18
- Yaw Rate Circuit Signal Amplitude Less Than Minimum

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 vehicle stability enhancement system (VSES) uses the lateral accelerometer input when calculating the desired yaw rate. The EBCM recieves the yaw/lateral accelerometer sensor data from dedicated serial data circuits.

Conditions for Running the DTC

* Ignition ON.
* The ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

C0186 00, 09, 18, 11 or C0196 00, 09, 11, 18

The yaw/lateral accelerometer sensor fails an internal self test.

C0186 09 or C0196 09

The yaw/lateral accelerometer sensor is not mounted properly.

C0186 4B

The yaw/lateral accelerometer sensor is not calibrated.

Action Taken When the DTC Sets

* The EBCM disables the VSES for the duration of the ignition cycle.
* A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Reference Information
Schematic Reference

Antilock Brake System Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

C0186 4B

Ignition ON, verify that DTC C0186 4B is not set.

If the DTC is set, with a scan tool perform the Acceleration Sensor Rest procedure.

C0186 00, 09, 18, 11 or C0196 00, 09, 11, 18
1. Ignition ON, verify that DTC U0125 are not set.

• If the DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions).

2. Verify the yaw/lateral accelerometer is mounted properly.

• If not mounted properly, refer to Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement (Service and Repair).

3. Replace the yaw/lateral accelerometer sensor. If the DTC resets, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for EBCM replacement, setup, and programming