For 1990-2009 cars

### 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 Descriptor

DTC C0187 5A: Lateral Acceleration Sensor Circuit Not Plausible
DTC C0196 5A: Yaw Rate Circuit Not Plausible
DTC C019B 5A: Yaw Rate Signal Not Plausible
DTC C0287 5A: Longitudinal Acceleration Sensor Circuit Not Plausible
DTC C0297 4A: Lost Communication With Yaw Rate Sensor

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
12 V Reference | U0125, U0126 | U0125, U0126 | -- | --
CAN Bus High Serial Data | U0073, U0074, U0100, U0101, U0104, U0125, U0126, U0128, U0136, U0139, U0140 | U0073, U0074, U0100, U0101, U0104, U0125, U0126, U0128, U0136, U0139, U0140 | U0073, U0074, U0100, U0101, U0104, U0125, U0126, U0128, U0136, U0139, U0140 | C0187 5A, C0196 5A, C019B 5A, C0287 5A
CAN Bus Low Serial Data | U0073, U0074, U0100, U0101, U0104, U0125, U0126, U0128, U0136, U0139, U0140 | U0073, U0074, U0100, U0101, U0104, U0125, U0126, U0128, U0136, U0139, U0140 | U0073, U0074, U0100, U0101, U0104, U0125, U0126, U0128, U0136, U0139, U0140 | C0187 5A, C0196 5A, C019B 5A, C0287 5A
Ground | -- | U0125 | -- | --

### Circuit/System Description

The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one multi-axis sensor, external to the electronic brake control module (EBCM). The EBCM supplies a 12 V reference voltage to the multi-axis sensor. The multi-axis sensor communicates with the EBCM via the high speed controller area network (CAN) serial data circuit. The EBCM activates the stability control function depending on multi-axis sensor input.

### Conditions for Running the DTC

Ignition ON

### Conditions for Setting the DTC

#### C0187 5A

• | No lateral acceleration sensor signal

• | The lateral acceleration sensor signal is not plausible with the yaw rate sensor signal, steering angle sensor signal and vehicle speed.

• | The lateral acceleration sensor offset is out of specified range.

#### C0196 5A

• | No yaw rate sensor signal

• | The yaw rate sensor signal is not plausible with the lateral acceleration sensor signal, steering angle sensor signal and vehicle speed.

• | The yaw rate sensor offset is out of specified range.

#### C019B 5A

The yaw rate sensor signal is out of specified range.

#### C0287 5A

• | No longitudinal acceleration sensor signal

• | The longitudinal acceleration sensor signal is not plausible with the vehicle acceleration.

• | The longitudinal acceleration sensor offset is out of specified range.

#### C0297 4A

A wrong multi-axis sensor is installed.

### Action Taken When the DTC Sets

#### C0187 5A, C0196 5A, C019B 5A, and C0297 4A

• | The EBCM disables the stability control and hill start assist for the duration of the ignition cycle.

• | The traction control/stability control-active indicator turns ON.

#### C0287 5A

The EBCM disables the hill start assist for the duration of the ignition cycle.

### Conditions for Clearing the DTC

• | A current DTC clears when the diagnostic runs and passes.

• | The EBCM will turn OFF the indicator in the next ignition cycle.

### 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

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Ignition ON, observe the scan tool Lateral Acceleration Signal and Yaw Rate Sensor parameters. On a level surface, the readings should be 0 V.

If vehicle is equipped with hill start assist:

Observe the scan tool Acceleration Sensor Longitudinal Signal parameter. On a level surface, the reading should be 0 V.

### Circuit/System Testing

1. Ignition ON, verify that DTC C0187 5A, C0196 5A, C019B 5A, and C0287 5A is not present.

⇒ | If any listed DTC is present, perform the LINK X Yaw Rate Sensor Learn.

2. Ignition OFF, disconnect the harness connector at the B119 Yaw and Lateral Accelerometer Sensor.
3. Test for less than 5 Ω between the ground circuit terminal 6 and ground.

⇒ | If greater than the specified value, test the ground circuit for an open/high resistance.

4. Ignition ON, test for greater than 11 V between the 12 V reference circuit terminal 5 and ground.

⇒ | If less than the specified value, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).

5. If all circuits test normal, replace the B119 Yaw and Lateral Accelerometer Sensor and verify the DTC does not reset.

⇒ | If the DTC resets, replace the K17 Electronic Brake Control Module (EBCM).

### Repair Instructions

• | Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Vehicle Yaw Sensor Replacement

• | Control Module References for EBCM replacement, setup and programming