Diagnostic Instructions

DTC Descriptors

DTC C0186 09: Lateral Accelerometer Circuit Rate of Change Above Threshold

DTC C0186 1A: Lateral Accelerometer Circuit Bias Level Out Of Range

DTC C0186 3B: Lateral Accelerometer Circuit Erratic Internal Self Test Failed

DTC C0186 75: Lateral Accelerometer Circuit Signal Above Allowable Range

DTC C0196 09: Yaw Rate Circuit Rate of Change Above Threshold

DTC C0196 1A: Yaw Rate Circuit Bias Level Out Of Range

DTC C0196 3B: Yaw Rate Sensor Internal Self Test Failed

DTC C0196 75: Yaw Rate Circuit Signal Above Allowable Range

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Yaw Rate/ Lateral Accelerometer Supply Voltage Circuit	U1826, U1827	U1826, U1827	U1826, U1827	--
Yaw Rate/ Lateral Accelerometer Communication Circuit	U1826, U1827	U1826, U1827	U1826, U1827	C0186/ C0196 09, 3B, 1A, 75,
Yaw Rate/ Lateral Accelerometer Communication Ground Circuit	U1826, U1827	U1826, U1827	U1826, U1827	--

Circuit/System Description

The lateral accelerometer and the yaw rate sensors are combined into one sensor. The sensors communicate through the serial data network to the Vehicle Stability Control Module along with other control modules to perform stability control. The vehicle stability enhancement system (with JL7) uses the lateral accelerometer input when calculating the desired yaw rate.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

C0186 09

The lateral accelerometer combination changes by more than 550 meters/second per second.

C0186 3B

The lateral accelerometer combination sensor fails an internal self test.

C0186 1A

The lateral accelerometer combination bias exceeds 3 meters/second.

C0186 75

The lateral accelerometer combination signal above allowable range.

C0196 09

The Yaw Rate combination sensor changes by more than 455 degrees/second per second.

C0196 3B

The Yaw Rate combination sensor fails an internal self test.

C0196 39

The Yaw Rate combination sensor has an internal electronic failure.

C0196 1A

The Yaw Rate combination bias exceeds 5.7 degrees/second.

C0196 75

The Yaw Rate combination signal above allowable range.

Action Taken When the DTC Sets

Conditions for Clearing the DTC

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 Verification

Ignition ON, observe the scan tool yaw rate and lateral accelerometer sensor parameter. The reading should be the same on all sensors when driving in a straight line at a constant speed greater than 20 km/h (13 mph), and will vary as the vehicle changes direction.

Circuit/System Testing

1. Verify that DTC U1826, U1827, or C0292 are not set.

⇒	If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.

2. Ignition OFF, disconnect the harness connector at the yaw rate/lat sensor.
3. Ignition OFF for 60 seconds, test for less than 5 ohms between the low reference circuit terminal 6 and ground.

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

4. Ignition ON, test for B+ between the ignition voltage circuit terminal 1 and ground.

⇒	If not within the specified range, test the ignition voltage circuit for a short to ground or open/high resistance. If DTC resets, replace the EBCM.

5. If all circuits test normal, replace the yaw rate/lat sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.