Antilock Brake System (With UGN)
DTC C0186, C018B, C0196, C019B, C027E, or C0287 (With UGN)
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 Acceleration Sensor Signal Malfunction (Inflatable Restraint Sensing and Diagnostic Module)
DTC C0186 5A
- Lateral Acceleration Sensor Signal Not Plausible (Electronic Brake Control Module)
DTC C0186 71
- Lateral Acceleration Sensor Signal Invalid Data (Electronic Brake Control Module)
DTC C018B 5A
- Lateral Acceleration Sensor Signal Not Plausible (Multi-axis Acceleration Sensor Module)
DTC C0196 00
- Yaw Rate Signal Malfunction (Electronic Brake Control Module and/or Inflatable Restraint Sensing and Diagnostic Module)
DTC C0196 5A
- Yaw Rate Signal Not Plausible (Electronic Brake Control Module)
DTC C0196 71
- Yaw Rate Signal Invalid Data (Electronic Brake Control Module)
DTC C019B 5A
- Yaw Rate Signal Not Plausible (Multi-axis Acceleration Sensor Module)
DTC C027E 5A
- Longitudinal Acceleration Sensor Signal Not Plausible (Multi-axis Acceleration Sensor Module)
DTC C0287 00
- Longitudinal Acceleration Sensor Malfunction (Inflatable Restraint Sensing and Diagnostic Module)
DTC C0287 4B
- Longitudinal Acceleration Sensor Signal Calibration Not Learned (Electronic Brake Control Module)
DTC C0287 5A
- Longitudinal Acceleration Sensor Signal Not Plausible (Electronic Brake Control Module)
DTC C0287 71
- Longitudinal Acceleration Sensor Signal Invalid Data (Electronic Brake Control Module)
Diagnostic Fault Information
Circuit/System Description
The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one multi-axis acceleration sensor, external to the electronic brake control module. The electronic brake control module supplies ignition voltage to the multi-axis acceleration sensor. The multi-axis acceleration sensor communicates with the electronic brake control module via serial data. The electronic brake control module activates the ABS, the traction control and the stability control depending on the multi-axis acceleration sensor input.
Conditions for Running the DTC
* Ignition ON begins the initialization of the brake system power-up self test.
* Drive the vehicle at speeds greater than 16 km/h (10 MPH) to complete the active brake system test.
Conditions for Setting the DTC
C0186 00 or C018B 5A
The lateral acceleration signal is out of the specified range.
C0186 5A
The lateral acceleration signal is not plausible with the yaw rate signal, steering angle signal and vehicle speed.
C0186 71
* The electronic brake control module received an invalid lateral acceleration signal.
* An open/high resistance is detected on the multi-axis acceleration ground circuit.
* A short to ground or open/high resistance is detected on the multi-axis acceleration ignition circuit.
C0196 00 or C019B 5A
The yaw rate signal is out of the specified range.
C0196 5A
* The yaw rate signal offset is out of the specified range.
* The yaw rate signal is not plausible with the lateral acceleration signal, the steering angle signal and the vehicle speed.
C0196 71
* A short to ground or open/high resistance is detected on the ignition circuit.
* The electronic brake control module received an invalid lateral acceleration signal.
* An open/high resistance is detected on the multi-axis acceleration ground circuit.
C027E 5A
The longitudinal acceleration signal is not plausible.
C0287 4B
The longitudinal acceleration sensor is not calibrated.
C0287 5A
The longitudinal acceleration signal is not plausible with the vehicle speed.
C0287 71
* An open/high resistance is detected on the multi-axis acceleration ground circuit.
* The electronic brake control module received an invalid longitudinal acceleration signal.
* A short to ground or open/high resistance is detected on the multi-axis acceleration ignition circuit.
Action Taken When the DTC Sets
* The adaptive cruise control is inhibted.
* The traction control Off indicator turns ON.
* The traction/stability control indicator turns ON.
* A Traction Control Off message may be displayed.
* A Service Stabilitrak message may be displayed.
* The electronic brake control module disables the traction control and stability control for the duration of the ignition cycle.
* The inflatable restraint sensing and diagnostic module may request the instrument cluster to illuminate the AIR BAG Indicator.
Conditions for Clearing the DTC
* The DTC clears when the diagnostic runs and passes.
* The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.
Reference Information
Schematic Reference
Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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 Control Module References for scan tool information
Circuit/System Verification
1. Verify the vehicle is equipped with UGN.
• If not equipped with UGN
Refer to DTC C0186, C0196, or C0287 (Without UGN) Antilock Brake System (Without UGN).
• If equipped with UGN
2. Ignition ON.
3. Verify DTC C0186 00, C0196 00, or C0287 00 is not set in the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If any of the DTCs are set
1. Perform the Vehicle Yaw Sensor Learn Testing and Inspection procedures to complete the learn.
2. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.
• If the DTC sets, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If the DTC does not set
3. All OK.
• If none of the DTCs are set
4. Verify DTC C0186, C0196, or C0287 is not set in the K17 Electronic Brake Control Module.
• If any of the DTCs are set
Refer to Circuit System/Testing.
• If none of the DTCs are set
5. Verify DTC C018B, or C019B is not set in the B119 Multi-axis Acceleration Sensor.
• If any of the DTCs are set
Refer to Circuit System/Testing.
• If none of the DTCs are set
6. All OK.
Circuit/System Testing
1. Ignition ON.
2. Verify DTC C0186 5A, C018B 5A, C0196 5A, C019B 5A, C027E 5A, C0287 4B, or C0287 5A is not set.
• If any of the DTCs are set
1. Perform the Vehicle Yaw Sensor Learn Testing and Inspection procedures to complete the learn.
2. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.
• If the DTC sets, replace the K17 Electronic Brake Control Module.
• If the DTC does not set
3. All OK.
• If none of the DTCs are set
3. Verify the B119 Multi-axis Acceleration Sensor is installed correctly.
• If loose or incorrect installation
Correct the installation of the component.
• If installed correctly
4. Ignition OFF, all vehicle system OFF, and the scan tool disconnected, disconnect the harness connector at the B119 Multi-axis Acceleration Sensor. It may take up to 2 minutes for all vehicle systems to power down.
5. Test for less than 10 ohms between the ground circuit terminal 6 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
6. Ignition ON.
7. Verify a test lamp illuminates between the ignition circuit terminal 5 and ground.
• If the test lamp does not illuminate
1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module.
2. Test for infinite resistance between the ignition circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K17 Electronic Brake Control Module.
• If the test lamp illuminates
8. Replace the B119 Multi-axis Acceleration Sensor.
9. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.
• If the DTC sets
Replace the K17 Electronic Brake Control Module.
• If the DTC does not set
10. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Vehicle Yaw Sensor Replacement Service and Repair
* Control Module References Control Module References for Electronic Brake Control Module or Inflatable Restraint Sensing and Diagnostic Module replacement, programming and setup