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U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) 3. VERIFY THAT THE ABS IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the ABS is active on the bus. Is the ABS active on the bus? Yes >> Go To 4 No >> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No Response diagnostic procedures. Perform BODY VERIFICATION TEST – VER 1. 4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs “Logged Against” the ABS? Yes >> Replace/update the Antilock Brake Module in accordance with the service information. Perform BODY VERIFICATION TEST – VER 1. No >> Replace/update the module that set this DTC in accordance with the service information Perform BODY VERIFICATION TEST – VER 1. HB ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS 8E - 49 |