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If communication with all other systems is not possible, there is a high possibility that
there is a malfunction of the diagnosis line. If only A/C control unit cannot communicate, malfunction of
the A/C control unit is suspected.
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- Malfunction of compressor & heater controller
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Refer to Inspection Procedure: Compressor & heater controller power supply
system  .
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 Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .)
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