Without JL7

DTC C0186 or C0196 (without JL7)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (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 55
- Lateral Accelerometer Circuit Expected Number of Transition/Events Exceeded

DTC C0186 5A
- Lateral Accelerometer Circuit Plausibility Failure

DTC C0186 0F
- Lateral Accelerometer Circuit Erratic

DTC C0196 55
- Yaw Rate Circuit Expected Number of Transition/Events Exceeded

DTC C0196 5A
- Yaw Rate Circuit Plausibility Failure

DTC C0196 0F
- Yaw Rate Circuit Erratic

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 receives the yaw/lateral accelerometer sensor data from dedicated serial data circuits.

Conditions for Running the DTC

* Ignition ON.
* Ignition voltage is greater than 10 V.

Conditions for Setting the DTC

* The yaw/lateral accelerometer sensor fails an internal self test.
* The correlation error between the yaw/lateral accelerometer sensor and steering angle sensor.

Actions Taken when the DTC Sets

* The EBCM disables the StabiliTrak 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.

Diagnostic Aids

An incorrectly mounted sensor can cause these faults.

Reference Information
Schematic Reference

Antilock Brake System Schematics (JL7) (Antilock Brake System Schematics (With RPO JL7))Antilock Brake System Schematics (Except JL7) (Antilock Brake System Schematics (Except RPO JL7))
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

1. Ignition On, verify that DTC U1826, U1827, or C0292 are not set.

• If any of the DTCs are set, Refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions).

2. With a scan tool, clear the DTC.
3. Test drive the vehicle while observing the scan tool Yaw Rate and Lateral Accelerometer Sensor parameter. The parameters should vary as the vehicle changes directions.

• If the parameters are locked or erratic, replace the yaw/lateral accelerometer sensor.

4. Replace the EBCM.

Repair Instructions

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

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