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Test Description

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

  1. 3:  Tests for the proper operation of the circuit in the low voltage range.
  2. 4:  Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
  3. 5:  Tests for a short to voltage in the 5-volt reference circuit.
  4. 6:  Tests the bias voltage of the yaw rate/lateral accelerometer sensor.
DTC C0186

Step Action Values Yes No
Schematic Reference: Antilock Brake System Schematics 
Connector End View Reference: Antilock Brake System Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Lateral Accelerometer Signal parameter in the Vehicle Stability Enhancement System (VSES) data list.
Does the scan tool display that the Lateral Accelerometer Signal parameter is within the specified range?		 0.15-4.85 V Go to Step 6  Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the yaw rate/lateral accelerometer sensor connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With the scan tool, observe the Lateral Accelerometer Signal parameter.
Does the scan tool display that the Lateral Accelerometer Signal parameter is less than the specified value?		 0.15 V Go to Step 4  Go to Step 10 
4 
  1. Turn OFF the ignition.
  2. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the yaw rate/lateral accelerometer sensor and the signal circuit of the yaw rate/lateral accelerometer sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With the scan tool, observe the Lateral Accelerometer Signal parameter.
Does the scan tool display that the Lateral Accelerometer Signal parameter is greater than the specified value?		 4.85 V Go to Step 5  Go to Step 8 
5 
  1. Disconnect the fused jumper wire.
  2. Measure the voltage between the 5-volt reference circuit of the yaw rate/lateral accelerometer sensor and the low reference circuit of the yaw rate/lateral accelerometer sensor.
Does the voltage measure less the specified value?		 5.1 V Go to Step 12  Go to Step 7 
6  Does the scan tool display that the Lateral Accelerometer Signal parameter is within the specified range? 2.3-2.7 V Go to Diagnostic Aids Go to Step 11 
7 Test the 5-volt reference circuit of the yaw rate/lateral accelerometer sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
8 Test the 5-volt reference circuit of the yaw rate/lateral accelerometer sensor for the following conditions:
  • An open
  • A short to ground
  • A high resistance

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 9 
9 Test the signal circuit of the yaw rate/lateral accelerometer sensor for the following conditions:
  • An open
  • A short to ground
  • A high resistance

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
10 Test the signal circuit of the yaw rate/lateral accelerometer sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
11 Test the low reference circuit of the yaw rate/lateral accelerometer sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 12 
12 Inspect for poor connections at the harness connector of the yaw rate/lateral accelerometer sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 14 
13 Inspect for poor connections at the harness connector of the electronic brake control module (EBCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 15 
14 Replace the yaw rate/lateral accelerometer sensor. Refer to Yaw Rate Sensor/Lateral Accelerometer Replacement .
Did you complete the repair?		 - Go to Step 16  -
15 Replace the EBCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the repair?		 - Go to Step 16  -
16
  1. Clear the DTCs using the scan tool.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 2  System OK
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