Diagnostic Instructions

DTC Descriptor

DTC C0196 00: Lateral Accelerometer Circuit

DTC C0196 09: Lateral Accelerometer Circuit Rate of Change Fault

DTC C0196 1A: Lateral Accelerometer Circuit Bias Level Out Of Range

DTC C0196 52: Lateral Accelerometer Circuit Compare Failure

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Lateral Accelerometer 5-volt Reference Circuit	C0196 00	C0196 00	C0196 00	--
Lateral Accelerometer Signal Circuit	C0196 00	C0196 00	C0196 00	C0196 1A, C0196 09, C0196 52
Lateral Accelerometer Low Reference Circuit	--	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 vehicles yaw motion by applying differential braking to the left or right front wheel.

The amount of differential braking applied to the left or right front wheel is based on both the yaw rate error and side slip rate error. The side slip rate error is a function of the lateral acceleration minus the product of the yaw rate and vehicle speed. The yaw rate error and side slip rate error are combined to produce the total delta velocity error. When the delta velocity error becomes too large and the VSES system activates, the drivers steering inputs combined with the differential braking will attempt to bring the delta velocity error toward zero.

The VSES activations generally occur during aggressive driving, in the turns or bumpy roads without much use of the accelerator pedal. When braking during VSES activation, the brake pedal will feel different than the antilock brake system (ABS) pedal pulsation. The brake pedal pulsates at a higher frequency during VSES activation.

Conditions for Running the DTC

C0196 00

C0196 09 and 1A

C0196 52

Conditions for Setting the DTC

C0196 00

One of the following conditions exist:

C0196 09

The yaw rate sensor changes by greater than 390 degrees/second per second.

C0196 1A

The yaw rate bias exceeds 7 degrees/second.

C0196 52

The yaw rate error is greater than 5 degrees/second 30 times in one drive cycle.

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Diagnostic Aids

Inspect the vehicle for proper steering alignment.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for Scan Tool Information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the yaw and lateral acceleration sensor.
2. Test for less than 5 ohms between the low reference circuit terminal D and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal B and ground.

⇒	If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.

4. Verify the scan tool Yaw Rate Signal parameter is less than 0 volt.

⇒	If greater than the specified range, test the yaw rate sensor signal circuit terminal C for a short to voltage. If the circuit tests normal, replace the EBCM.

5. Install a 3A fused jumper wire between the signal circuit terminal C and the 5-volt reference circuit terminal B. Verify the scan tool Lateral Accelerometer Signal is greater than 4.8 volts.

⇒	If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the EBCM.

6. If all circuits test normal, test or replace the yaw and lateral acceleration sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.