GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The electronic brake control module (EBCM) supplies 5 volts to the yaw rate sensor/lateral accelerometer. When the vehicle is not moving, or is being driven in a stable, straight line, yaw rate is 0 degrees/second and the yaw rate sensor signal voltage is very near 2.5 volts. This is referred to as sensor bias voltage. Performing a turning maneuver causes the yaw rate sensor signal voltage to increase, or decrease, depending on the direction of the turn. The sharper the turn, the greater the change in signal voltage. Since the yaw rate signal is affected by temperature, the EBCM also monitors a Hz frequency signal from the yaw rate sensor/lateral accelerometer which is proportionate to the approximate temperature of the yaw rate sensor.

Conditions for Running the DTC

    • The ignition is ON.
    • The Vehicle Stability Enhancement System (VSES) sensors have been successfully initialized or the message center has displayed the stability system disabled message due to an unsuccessful initialization attempt. Refer to ABS Description and Operation for a complete explanation of VSES sensor initialization.
    • The vehicle is being driven relatively straight and level at a speed greater than 11 km/h (7 mph), before performing a stable turning maneuver.

Conditions for Setting the DTC

Any of the following conditions may cause the DTC to set.

    • Open yaw rate sensor circuitry is detected.
    • Shorted yaw rate sensor circuitry is detected.
    • An erratic yaw rate sensor signal is detected.
    • The EBCM detects that the yaw rate sensor signal does not correspond with signals from other sensors.
    • The EBCM detects that the yaw rate sensor frequency signal is not within the valid range.
    • A voltage near 5 volts is detected on the yaw rate sensor test circuit at all times.
    • A voltage near 0 volts is detected on the yaw rate sensor test circuit at all times.

Action Taken When the DTC Sets

    • The EBCM disables the VSES.
    • The message center displays the service stability system message.

Conditions for Clearing the DTC

The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Diagnostic Aids

    • The following scenario may cause this DTC to set when no actual malfunction exists.
       - The vehicle is driven in a straight line in reverse at a speed greater than 13 km/h (8 mph).
       - The transmission is shifted into neutral while the vehicle continues to coast backward.
       - A turning maneuver is performed after the above conditions are met and the vehicle speed is still greater than 13 km/h (8 mph).
    • This DTC may also set falsely if the yaw rate sensor is replaced without first following the diagnostic table below. Whenever a new yaw rate sensor is installed, the old sensor must be disconnected, the ignition turned ON for 5 seconds and then OFF, and then the new sensor connected.
    • Inspect the vehicle for proper wheel alignment. Ensure the vehicle does not pull toward the left or right while driving straight forward on a level surface.
    • Communicate with the customer to determine the conditions under which the message center displays the service stability system message. Learning the conditions under which the DTC sets may help you duplicate the failure.
    • Use the Snapshot function on the scan tool in order to assist you in locating an intermittent malfunction.

Test Description

The number below refer to the step number on the diagnostic table.

  1. This step tests for a shorted resistor in the EBCM or a short to voltage within the circuit, by verifying that a large voltage drop occurs in the circuit when the test lamp is placed in parallel with the DMM.

Step

Action

Values

Yes

No

Important: If DTC C0292 is set, diagnose C0292 before proceeding with diagnostics for C0196.

Always use connector test adapters when performing tests to avoid damage to delicate connector terminals.

Schematic Reference: Antilock Brake System Schematics

Connector End View Reference: Antilock Brake System Connector End Views

1

Did you perform the Antilock Brake System (ABS) Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - ABS

2

  1. Use the scan tool to clear the DTCs.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 3

Go to Diagnostic Aids

3

  1. Turn ON the ignition.
  2. Disconnect the yaw rate sensor/lateral accelerometer harness connector. Refer to Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement .
  3. Select the Vehicle Stability Enhancement System (VSES) Data Display function on the scan tool.
  4. Observe the Yaw Rate Sensor Input on the scan tool.

Is the Yaw Rate Sensor Input less than the specified value?

0.6 V

Go to Step 4

Go to Step 19

4

  1. Connect a fused jumper wire between the yaw rate sensor/lateral accelerometer 5-volt reference circuit and the yaw rate signal circuit. Refer to Using Fused Jumper Wires in Wiring Systems.
  2. Observe the Yaw Rate Sensor Input on the scan tool.

Is the Yaw Rate Sensor Input greater than the specified value?

4.4 V

Go to Step 5

Go to Step 7

5

  1. Disconnect the fused jumper wire.
  2. Use a DMM to measure the voltage between the yaw rate sensor/lateral accelerometer 5-volt reference circuit and the yaw rate sensor/lateral accelerometer low reference circuit.

Does the voltage measure greater than the specified value?

4.75 V

Go to Step 9

Go to Step 6

6

Test the yaw rate sensor/lateral accelerometer low reference circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 17

7

Test the yaw rate signal circuit for the following conditions.

    • An open
    • A high resistance
    • A short to ground

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 8

8

Test the yaw rate sensor/lateral accelerometer 5-volt reference circuit for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 17

9

Use a DMM to measure the voltage on the yaw rate frequency circuit.

Does the voltage measure greater than the specified value?

4.75 V

Go to Step 10

Go to Step 13

10

Use a DMM to measure the voltage on the yaw rate sensor test circuit.

Does the voltage measure greater than the specified value?

4.75 V

Go to Step 11

Go to Step 15

11

  1. Turn OFF the ignition.
  2. Reconnect the yaw rate sensor/lateral accelerometer harness connector.
  3. Disconnect the electronic brake control module (EBCM) harness connector.
  4. Install a J 39700 Universal Breakout Box and a J 39700-650 Adapter Cable. Install the equipment between the EBCM and the EBCM harness connector.
  5. Turn ON the ignition.
  6. At the breakout box, use a DMM to measure the Hz frequency between the yaw rate frequency circuit and a ground circuit.

Does the HZ frequency signal measure within the specified range?

13.37-14.36 kHz

Go to Step 16

Go to Step 12

12

  1. With the DMM still connected to monitor the yaw rate frequency circuit, set the DMM to measure DC voltage.
  2. Connect one end of a test lamp to a good ground.
  3. Connect the other end of the test lamp to the positive lead of the DMM.

Does the voltage measure less than the specified value?

0.15 V

Go to Step 16

Go to Step 14

13

Test the yaw rate frequency circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 17

14

Test the yaw rate frequency circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 19

15

Test the yaw rate sensor test circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 17

16

  1. Inspect for poor connections at the harness connector of the yaw rate sensor/lateral accelerometer. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
  2. Ensure the yaw rate sensor/lateral accelerometer is mounted securely and that the mounting bracket is not bent or otherwise damaged.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 18

17

Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 19

18

Important: The Yaw Rate Reference Table Reset Procedure must be performed when you are instructed to do so during the Yaw Rate Sensor/Lateral Accelerometer Replacement procedure.

Replace the yaw rate sensor/lateral accelerometer. Refer to Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement .

Did you complete the replacement?

--

Go to Step 20

--

19

Important: Following EBCM replacement, perform the set-up procedure for the EBCM and perform the Yaw Rate Reference Table Reset Procedure. Use the scan tool to perform the Tire Size Calibration procedure.

Replace the EBCM. Refer to Electronic Brake Control Module Replacement .

Did you complete the replacement?

--

Go to Step 20

--

20

  1. Use the scan tool Clear All Class 2 DTCs function to clear all of the DTCs from all modules.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 3

System OK