Antilock Brake System - Non-Hybrid Less than 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 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 EBCM supplies the 12 V to the yaw/lateral accelerometer sensor. 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 accelerometer 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.
* The ABS indicator illuminates.
* The red Brake warning indicator illuminates.
* The StabiliTrak indicator illuminates.
* The driver information center displays All Wheel Drive Off/Service Traction Control/Service StabiliTrak message.
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.
Diagnostic Aids
* The EBCM will shut down if it detects a fault or sets a DTC.
* An incorrectly mounted sensor can set a DTC.
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 (ABS (Non-Hybrid Less than 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 (Control Module References) for scan tool information
Circuit/System Testing
1. Verify that DTC C0710 is not set.
• If the DTC is set, refer to DTC C0710 (Antilock Brake System - Non-Hybrid Less than 3900 kg (8600 lb) GVW).
2. Ignition OFF, disconnect the harness connector at the yaw/lateral accelerometer sensor.
3. 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 1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
4. Disconnect the harness connector at the EBCM.
5. Test for infinite resistance between the 12 V reference circuit terminal 32 of the EBCM connector and ground.
• If not the specified value, test the 12 V reference circuit for a short to ground.
6. Test for less than 2 ohm between the 12 V reference circuit terminal 32 of the EBCM connector and terminal 4 of the yaw/lateral accelerometer sensor connector.
• If greater than the specified range, test the 12 V reference circuit for open/high resistance.
7. If all circuits test normal, 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 Accelerometer Replacement (Greater than/Equal to 3900 kg (8600 lb) GVW)
* Control Module References (Control Module References) for EBCM replacement, programming and setup