Diagnostic Test

VERIFY DTC IS ACTIVE
NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
1. Turn the ignition on.
2. With the scan tool, select View DTCs.
  Is this DTC Active?
  
  Yes
  - . Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing and perform the U0121-Lost Communication with Anti-Lock Brake Module diagnostic procedure.
  No
  - . Refer to Non-DTC Diagnostics/Communication - Diagnosis and Testing and perform the Stored Lost Communication DTC diagnostic procedure.