Antilock Brake System - Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW
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 Instructionsprovides 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 yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one yaw/lateral accelerometer sensor, external to the electronic brake control module (EBCM). The EBCM supplies ignition voltage to the yaw/lateral accelerometer sensor. The vehicle stability enhancement system 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 volts.
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 driver information center 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 Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
ABS Description and Operation ABS (Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW)
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 Relearningfor scan tool information
Circuit/System Verification
1. Ignition ON, using a scan tool, clear the DTC.
2. 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, refer to Circuit/System Testing.
Circuit/System Testing
1. Verify that DTC U1826, C0710 or C0292 is not set.
• If any of the DTCs are set, Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Inspect the yaw/lateral accelerometer sensor for correct installation.
• If loose or incorrect installation is diagnosed, correct the installation of the component.
3. Ignition OFF, disconnect the harness connector at the yaw/lateral accelerometer sensor.
4. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohm between the ground circuit terminal 6 and ground.
• If greater than the specified value, test the ground circuit for an open/high resistance.
5. Ignition ON, test for greater than 11 V between the 12 V reference circuit terminal 1 and ground.
• If less than the specified value, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
6. If all circuits test normal, replace the yaw/lateral accelerometer sensor and verify the DTC does not reset.
• 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 Accelerometer Replacement Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW
* Control Module References Programming and Relearningfor EBCM replacement, programming and setup