C0186

DTC C0186 or C0196

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC C0186 00
- Lateral Accelerometer Circuit

DTC C0186 5A
- Lateral Accelerometer Circuit Plausibility Failure

DTC C0196 00
- Yaw Rate Circuit

DTC C0196 5A
- Yaw Rate Circuit Plausibility Failure

Diagnostic Fault Information





Circuit/System Description

The yaw rate and the lateral accelerometer 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 yaw/lateral accelerometer sensor communicates with the EBCM via discrete CAN Bus High and CAN Bus Low serial data circuits.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

* Short to ground on the CAN High serial data circuit.
* The yaw/lateral combination sensor fails an internal self test.
* Communication is lost between the EBCM and the yaw/lateral combination sensor.
* The correlation error between the yaw/lateral combination sensor and steering angle sensor.

Action Taken When the DTC Sets

One or more of the following actions may occur:

* The EBCM disables the antilock brake system (ABS)/traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
* A DIC message and/or a warning message 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 100 consecutive drive cycles.

Reference Information
Schematic Reference

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

Component Connector End Views (Connector End Views By Name)
Description and Operation

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

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

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

Circuit/System Testing

1. Verify that DTC C0710, U2100, or U2142 and not set.

• If C0710, U2100, or U2142 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).

2. Ignition OFF, disconnect the harness connector at the yaw/lateral accelerometer sensor.
3. Ignition OFF for 60 seconds, test for less than 5 ohm between the low reference circuit terminal 1 and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance.

4. Ignition ON, test for B+ between the ignition voltage circuit terminal 4 and ground.

• If not within the specified range, test the ignition voltage circuit for a short to ground or open/high resistance.

5. If all circuits test normal, replace the yaw/lateral accelerometer sensor.

Repair Instructions

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

Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement (Service and Repair)