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Home >> Pontiac >> 2010 >> G5 Base, Standard >> Repair and Diagnosis >> Brakes >> Antilock Brake System With Traction Control System & Stability Control System >> Diagnostic Information and Procedures >> DTC C0186 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the yaw/lateral accelerometer sensor.
  2. Ignition OFF for 60 seconds, test for less than 5 Ω between the low reference circuit terminal 5 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance.
  3. Ignition ON, test for B+ between the ignition voltage circuit terminal 3 and ground.
    • If not within the specified range, test the ignition voltage circuit for a short to ground or open/high resistance.
  4. Ignition OFF, disconnect the harness connector at the EBCM.
  5. Ignition ON, test for less than 1 V between the serial data signal terminals listed below and ground.
    • CAN Bus High serial data signal circuit terminal 18
    • CAN Bus Low serial data signal circuit terminal 19
    • If greater than the specified value, test the appropriate serial data circuit for a short to voltage.
  6. Ignition OFF, test for infinite resistance between the serial data signal terminals listed below and ground.
    • CAN Bus High serial data signal circuit terminal 18
    • CAN Bus Low serial data signal circuit terminal 19
    • If not the specified value, test the serial data signal circuit for a short to ground.
  7. Test for less than 2 Ω between the serial data signal circuit terminals listed below.
    • CAN Bus High serial data signal circuit terminal 18 at the EBCM harness connector and terminal 2 at the yaw/lateral accelerometer sensor harness connector.
    • CAN Bus Low serial data signal circuit terminal 19 at the EBCM harness connector and terminal 1 at the yaw/lateral accelerometer sensor harness connector.
    • If greater than the specified range, test the serial data signal circuit for an open/high resistance.
  8. Test for infinite resistance between the CAN Bus High serial data signal circuit terminal 18 and the CAN Bus Low serial data signal circuit terminal 19.
    • If not the specified value, repair the serial data circuits for a short together.
  9. If all circuits test normal, replace the yaw/lateral accelerometer sensor. If the DTC resets, replace the EBCM.
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