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Test Description

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  This step tests for specified voltage on the lateral accelerometer signal circuit.
  2. 3:  This step tests for B+ voltage on yaw/lateral accelerometer sensor.
  3. 4:  This step tests the ignition circuit for a high resistance or open.
  4. 5:  This step checks to see if the voltage was below or above the specified voltage.
  5. 6:  This step checks to see if the voltage was above the specified voltage.
  6. 7:  This step checks to see if the voltage was below the specified voltage.
  7. 8:  This step checks to see if the voltage was above the specified voltage.
  8. 9:  This step checks to see if the resistance of the ground circuit is less than 5 ohms.
  9. 10:  This step tests for a short to voltage on the 5-volt reference circuit.
  10. 11:  This step tests for a short to ground, a high resistance or an open in the 5-volt reference circuit.
  11. 12:  This step tests for a short to ground, a high resistance or an open in the lateral accelerometer signal circuit.
  12. 13:  This step tests for a short to voltage in the lateral accelerometer signal circuit.
  13. 14:  This step tests for a high resistance or an open in the ground circuit.
  14. 15:  This step checks the yaw/lateral accelerometer sensor connector for poor connections.
  15. 16:  This step checks the EBCM connector for poor connections.
DTC C0186

Step Action Value(s) Yes No
Schematic Reference: ABS Schematics 
Connector End View Reference: ABS Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Turn OFF the ignition.
  2. Disconnect the electronic brake control module (EBCM).
  3. Install the J 39700  Universal Pinout Box with the J 39700-530  Cable Adapter between the EBCM and the EBCM harness connector. See Special Tools .
  4. Turn ON the ignition, with the engine OFF.
  5. Using the DMM, measure the voltage between pin 10 and pin 15 of the J 39700  . See Special Tools .
Is the voltage within the specified value?		 0.25-4.75 V Go to Diagnostic Aids Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the yaw/lateral accelerometer sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. Using a DMM, measure the voltage between the ignition and ground circuits of the yaw/lateral accelerometer sensor.
Is the voltage in the specified value?		 B+ Go to Step 5  Go to Step 4 
4  Test the ignition circuit of the yaw/lateral accelerometer sensor for high resistance or an open.
Did you find and correct the condition?		 - Go to Step 19  Go to Power Distribution Schematics
5 
  1. Reconnect the yaw/lateral accelerometer sensor.
  2. Using a DMM, measure the voltage between pin 10 and pin 15 of the J 39700  . See Special Tools .
Is the voltage less than the specified value?		 4.75 V Go to Step 6  Go to Step 13 
6  Using a DMM, measure the voltage between pin 10 and pin 15 of the J 39700  . See Special Tools .
Is the voltage greater than the specified value?		 0.25 V Go to Step 7  Go to Step 12 
7  Using a DMM, measure the voltage between the 5-volt reference circuit pin 16 and the ground circuit pin 15 on the J 39700  . See Special Tools .
Does the voltage measure less than the specified value?		 2 V Go to Step 11  Go to Step 8 
8  Using a DMM, measure the voltage between the 5-volt reference circuit pin 16 and ground circuit pin 15 on the J 39700  . See Special Tools .
Does the voltage measure greater than the specified voltage?		 3 V Go to Step 10  Go to Step 9 
9 
  1. Turn OFF the ignition.
  2. Disconnect the negative battery cable.
  3. Measure the resistance from the ground circuit of the yaw/lateral accelerometer to a good ground.
Does the resistance measure less than the specified value?		 5 Ω Go to Step 16  Go to Step 14 
10  Test the 5-volt reference circuit of the yaw/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 19  Go to Step 15 
11  Test the 5-volt reference circuit of the yaw/lateral accelerometer sensor for a short to ground, a high resistance or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 19  Go to Step 12 
12  Test the lateral accelerometer signal circuit of the yaw/lateral accelerometer sensor for a short to ground, a high resistance or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 19  Go to Step 15 
13  Test the lateral accelerometer signal circuit of the yaw/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 19  Go to Step 15 
14 
  1. Disconnect the EBCM.
  2. Test the ground circuit of the yaw/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 19  Go to Step 15 
15  Inspect for poor connections at the harness connector of the yaw/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 19  Go to Step 17 
16  Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 19  Go to Step 18 
17 Replace the vehicle yaw/lateral accelerometer sensor. Refer to Yaw Rate Sensor/Lateral Accelerometer Replacement .
Did you complete the replacement?		 - Go to Step 19  -
18 Replace the EBCM. Refer to Control Module References for replacement, setup and programming.
Did you complete the replacement?		 - Go to Step 19  -
19
  1. Use the scan tool in order to clear the DTCs.
  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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