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DTC U0104: Lost Communication with Driving Support ECU [08/2013 - ]: Description

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
DTC No. DTC Detection Condition Trouble Area
U0104 No communication from the driving support ECU assembly continues.
  • Driving support ECU assembly branch line or connector
  • Power source circuit of driving support ECU assembly
  • Driving support ECU assembly ground circuit
  • Driving support ECU assembly

HINT: 

This diagnosis procedure is for when DTC U0104 is output by the power management control ECU (Techstream display: PM1 Gateway).

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