Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
  NOTE:
  Make sure the Ignition Off Draw (IOD) fuse is installed and battery voltage is between 10.0 and 16.0 volts.
2. Using the scan tool, select ECU view.
  NOTE:
  A red "X" will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
  
  NOTE:
  Check the Body Control Module (BCM) for any active CAN C hardware DTCs, perform DTC before proceeding. Refer to the DTC INDEX article.
  
  Does the scan tool display a red "X" next to the module?
  
  Yes
  - Go To 2
  No
  - The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
POWER CIRCUIT OPEN OR SHORTED
1. Turn the ignition off.
2. Disconnect the Dynamics Sensor harness connector.
3. Using a 12-volt test light connected to ground, check the Fused B(+) circuit.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To 3
  No
  - Repair the Fused B(+) circuit for an open or short.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
GROUND CIRCUIT OPEN
1. Using a 12-volt test light connected to 12-volts, check the (Z910) Ground circuit.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To 4
  No
  - Repair the Ground circuit for an open.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CAN C BUS (+) CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the Dynamics Sensor harness connector.
3. Measure the resistance of the CAN C Bus (+) circuit between the Dynamics Sensor harness connector and the ABS Module harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the CAN C Bus (+) circuit for an open.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CAN C BUS (-) CIRCUIT OPEN
1. Measure the resistance of the CAN C Bus (-) circuit between the Dynamics Sensor harness connector and the ABS Module harness connector.
  Is resistance below 5.0 Ohms?
  
  Yes
  - Replace the Anti-lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (D64) CAN C Bus (-) circuit for an open.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .