Normal Operation and Fault Conditions

With the ignition ON, the diagnostic scan tool communicates with the ABS module over the HS-CAN2. Communications can be interrupted by a wiring condition such as a short to ground, a short to voltage or an open circuit; module failure is also a cause of no communication. 

Possible Causes 

• Fuse
• Wiring, terminals or connectors
• ABS module

1. AT1: VERIFY THE NO COMMUNICATION DIAGNOSTICS HAVE BEEN PERFORMED 
   NOTE: Diagnostics in Module Communications Network MUST BE CARRIED OUT before continuing with this pinpoint test.
   • Carry out the appropriate pinpoint test in Module Communications Network .
   • Has the appropriate pinpoint test in  Module Communications Network  been carried out for the no communication concern? 

     Yes	No
     INSTALL a new ABS module. CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new ABS module.	REFER to Module Communications Network and CARRY OUT the ABS module does not respond to the diagnostic scan tool pinpoint test.