Toyota Inverter Clocked Serial Interface Protocol

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This page is dedicated to use of Toyota inverters (Lexus / Camary / Gen3 Prius / Auris / Yaris) unmodified via the serial protocol (REQ, CLK, HTM, MTH). This page also contains wiring and connector information for the various models of Toyota Inverters.

Toyota Protocol

  • REQ Request line from hybrid controller to Inverter
  • CLK Clock signal from hybrid controller to Inverter (Constant 500KHz)
  • HTM Hybrid controller to Inverter data frame
  • MTH Inverter to Hybrid controller data frame

The number of bytes sent/received during a transfer will depend on the model of inverter, the table bel at 500kbpsow outlines the number of bytes for the different inverter models:-

Bus Transfer Sequence starts with the REQ line changing state

Toyota Serial example waveforms

Data logging Toyota Serial Protocol











Toyota Inverter Connectors

Lexus GS450 / Camry


Gen3 Pruis / Auris / Yaris

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