HVAC is actually ATC(Automatic Temperature Controller) in the circuit diagram of ZP22 HEV.
TCU(Transmission Control Module) uses “TCU Local LIN1″(FC167-65) to control ATC(FA229-6) and compressor(Electrical Air conditioning compressor, EN041-3).
Software reprogramming is not necessary for ATC, and the diagnose of ATC will be done by TCU, So, ATC will not be shown in SIPS or VDS.