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DTC U1100: Lost Communication with Seat Belt Control 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
U1100 No communication from the seat belt control ECU continues.
  • Seat belt control ECU branch line or connector
  • Power source circuit of seat belt control ECU
  • Seat belt control ECU ground circuit
  • Seat belt control ECU

HINT: 

This diagnosis procedure is for when DTC U1100 is output by the power management control ECU (Techstream display: PM1 Gateway).