DTC U0073/86: Control Module Communication Bus OFF; DTC U0100/85: Lost Communication with ECM / PCM "A"; DTC U0129/83: Lost Communication with Brake System Control Module: Procedure

WARNING: This page is about a different car, the 2011 Toyota Matrix. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR DTC
1. Check for DTC. Refer to DTC CHECK / CLEAR .
2. Record the output DTC (4WD control system).
  HINT:
  
  When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.
NEXT → See step 2
GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING