Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC C0196 00: Yaw Rate Circuit No Additional InformationDTC C0196 28: Yaw Rate Circuit Incorrect Frequency
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
12-Volt Reference | C0292 00 | C0292 00 | C0292 00 | -- |
Yaw Rate Sensor Signal | C0196 00 | C0196 00 | C0196 00, C0196 28, C0292 00 | -- |
Lateral Accelerometer Signal | C0186 00 | C0186 00 | C0186 00, C0292 00 | -- |
Yaw Rate Diagnostic Signal | C0196 28 | C0196 28 | C0196 28 | C0196 28 |
Low Reference | C0186 00, C0196 00 | C0186 00, C0196 00 | C0186 00, C0196 00 | -- |
Circuit/System Description
The vehicle stability enhancement system (VSES) is activated by the electronic brake control module (EBCM) calculating the desired yaw rate and comparing it to the actual yaw rate input. The desired yaw rate is calculated from measured steering wheel position, vehicle speed, and lateral acceleration. The difference between the desired yaw rate and actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM will attempt to correct the vehicle yaw motion by applying differential braking to the wheels.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | Ignition voltage is greater than 8 volts. |
Conditions for Setting the DTC
C0196 00
| • | The vehicle speed has reached at least 15 km/h (9 mph) from a stop more three times during the same ignition cycle. Then during the time the vehicle is stationary, the yaw rate signal value is more than 7 deg/sec for 2 seconds. |
| • | When vehicle speed is more than 25 km/h (16 mph) in a turn the difference between the yaw rate, steering angle, lateral acceleration, and wheel speed sensor values are not correlated three consecutive times. |
| • | Yaw rate changes greater than 20 deg/sec in 6 ms 4 times in 1 second. |
| • | The yaw/lateral combination sensor fails an internal self test. |
C0196 28
The yaw frequency measured is not between 13400.0-14600.0 Hz for more than 200 msec.
Action Taken When the DTC Sets
| • | The EBCM turns OFF the 12-volt reference circuit, until the ignition is cycled. |
| • | The driver information center (DIC) displays the Service Stabilitrak message. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
Important: When testing the yaw rate diagnostic frequency circuit include all bulkhead, and splice connectors in the harness between the EBCM and the sensor.
| • | If DTC C0292 is set, diagnose that DTC first. |
| • | If the yaw and lateral accelerometer sensor is disconnected, DTCs will set and the EBCM will not provide 12-volt reference. |
| • | The yaw rate and lateral accelerometer sensors are located in one unit and cannot be serviced separately. |
| • | A poor ground connection for the EBCM may cause this DTC to set. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
C0196 00
- Visually inspect the yaw rate sensor/lateral accelerometer for proper and secure mounting.
- Ignition OFF, disconnect the harness connector at the yaw rate sensor/lateral accelerometer.
- Ignition OFF for 30 seconds, test for less than 1 ohm between the low reference circuit terminal 6 and ground.
- Ignition ON, test for 12-volts between the 12-volt reference circuit terminal 1 and ground.
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition ON, test for less than 1 volt between the following signal circuits and ground:
- Test for less than infinite resistance between the following signal circuits and ground:
- Test for less than 2 ohms between the following signal circuit terminals:
- If all circuits test normal, test or replace the yaw rate sensor/lateral accelerometer. After replacement and programming, operate the vehicle within the conditions for running the DTC and verify DTC C0196 00 does not set.
| ⇒ | If the sensor is improperly secured, remove and properly install the sensor. |
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If greater than the specified value, test the 12-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM. |
| ⇒ | If less than the specified range, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM. |
| • | Yaw rate signal terminal 3 |
| • | Lateral accelerometer signal terminal 2 |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. |
| • | Yaw rate signal terminal 3 |
| • | Lateral accelerometer signal terminal 2 |
| ⇒ | If not the specified value, test the signal circuit for a short to ground. |
| • | Terminal 3 at the sensor harness connector and terminal 21 at the EBCM harness connector |
| • | Terminal 2 at the sensor harness connector and terminal 33 at the EBCM harness connector |
| ⇒ | If greater than the specified range, test the signal circuit for an open/high resistance. |
| ⇒ | If the DTC sets, replace the EBCM. |
C0196 28
- Verify DTC C0196 00 is not set.
- Ignition OFF, disconnect the harness connector at the yaw rate sensor/lateral accelerometer.
- Test for 2.5k-6.5k ohms between the yaw rate diagnostic signal circuit terminal 4 and ground.
- If all circuits test normal, test or replace the yaw rate sensor/lateral accelerometer. After replacement and programming, operate the vehicle within the conditions for running the DTC and verify DTC C0196 28 does not set.
| ⇒ | If DTC C0196 00 is set, refer to the above diagnostic procedure for C0196 00 before proceeding. |
| ⇒ | If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If less than the specified range, test the signal circuit for short to ground. If the circuit tests normal, replace the EBCM. |
| ⇒ | If the DTC sets, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup, and programming |
