Diagnostic Test

VERIFY DTC IS ACTIVE
NOTE:
Make sure the battery voltage is between 10 and 16 volts before proceeding.
1. With the scan tool, read active DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2.
  No
  - Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCS diagnostic procedure.
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
1. With the scan tool, read all active DTCs from all modules.
  Does the scan tool display any active DTCs to the conditions listed above?
  
  Yes
  - Go to and perform the appropriate diagnostic procedure.
  No
  - Go To 3.
VERIFY THE ABS IS ACTIVE ON THE BUS
1. Turn the ignition ON.
2. With the scan tool, verify the ABS is active on the BUS.
  Is the ABS active on the BUS?
  
  Yes
  - Go To 4.
  No
  - Refer to DIAGNOSIS AND TESTING and perform the NO RESPONSE FROM ABS diagnostic procedure.
CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. With the scan tool, read all the DTCs.
  Is there more than one module with active DTCs "Logged Against" the ABS?
  
  Yes
  - Replace and program the ABS module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
  - Refer to STANDARD PROCEDURE and perform the ABS VERIFICATION TEST.
  No
  - Go To 5.
CLEAR DTC IN MODULE SETTING FAULT
1. With the scan tool, select the module setting the DTC against the ABS.
2. Clear active DTCs.
  Is this DTC still active?
  
  Yes
  - Replace and program the module that set this DTC in accordance with the Service Information.
  - Perform the appropriate verification test for the module being replaced. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 6.
CYCLE IGNITION
1. Cycle the ignition from RUN to OFF three times ending with the key in the RUN position.
  Does the DTC become active?
  
  Yes
  - Go To 7.
  No
  - The 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.
  - Perform the appropriate verification test for the module. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK FOR ADDITIONAL LOST COMMUNICATION FAULTS
1. With the scan tool, view the modules.
  Does the BCM and other CAN C BUS modules show Lost Communication with the remaining CAN C BUS modules?
  
  Yes
  - Go To 8.
  No
  - Replace and program the module that set this DTC in accordance with the Service Information.
  - Perform the appropriate verification test for the module being replaced. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE CAN C BUS (+) CIRCUIT FOR A SHORT TO VOLTAGE
1. Measure the voltage between the CAN C BUS (+) circuit and ground.
  Is the voltage above 5.0 volts?
  
  Yes
  - Repair the short to voltage in the CAN C BUS (+) circuit. The short to voltage is present in one of the CAN C BUS circuits. Use the Star Connectors to isolate portions of the CAN C BUS in order to locate the concern.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
  No
  - Go To 9.
CHECK THE CAN C BUS (-) CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition OFF.
2. Measure the resistance between ground and the CAN C BUS (-) circuit.
  Is the resistance below 10k Ohms?
  
  Yes
  - Repair the short to ground in the CAN C BUS (-) circuit. The short to ground is present in one of the CAN C BUS circuits. Use the Star Connectors to isolate portions of the CAN C BUS in order to locate the concern.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
  No
  - Replace and program the module that set this DTC in accordance with the Service Information.
  - Perform the appropriate verification test for the module being replaced. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .