CLIMATE CONTROL SEAT SYSTEM TERMINALS OF ECU


  1. A/C AMPLIFIER ASSEMBLY

    A01NG4QE04

    1. Disconnect the F50 connector.

    2. Measure the voltage and resistance according to the value(s) in the table below.

      Tech Tips

      Measure the values on the wire harness side with the connector disconnected.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      F50-21 (B) - Body ground G - Body ground A/C amplifier power supply Always 11 to 14 V
      F50-1 (IG+) - Body ground P - Body ground A/C amplifier power supply Power switch on (IG) 11 to 14 V
      F50-14 (GND) - Body ground W-B - Body ground A/C amplifier ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the F50 connector.

    4. Measure the voltage and resistance according to the value(s) in the table below.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      F51-6 (SG-5) - Body ground L - Body ground Seat heater switch volume ground Always Below 1 Ω
      F51-8 (S5-2) - Body ground BR - Body ground Seat heater switch volume power source Power switch on (IG) 4.5 to 5.5 V
      F51-15 (SVDS) - Body ground SB - Body ground Seat heater switch volume signal Seat heater switch volume between 0 and 3 0 to 5 V
      F51-16 (SVPS) - Body ground

      LG*1 - Body ground

      GR*2 - Body ground

      		 Seat heater switch volume signal Seat heater switch volume between 0 and 3 0 to 5 V
      F51-10 (SVPB) - Body ground

      G*1 - Body ground

      V*2 - Body ground

      		 Climate control blower control signal Power switch on (IG), climate control switch on.

      Pulse generation

      (See waveform)
      F51-9 (SVDB) - Body ground GR - Body ground Climate control blower control signal Power switch on (IG), climate control switch on.

      Pulse generation

      (See waveform)

      Tech Tips

      *1: LHD

      *2: RHD

      If the result is not as specified, the ECU may have a malfunction.


      1. A01NFOCE03

        Waveform (Reference): Using an oscilloscope:

        Tester Connection

        F51-10 (SVPB) - Body ground

        F51-9 (SVDB) - Body ground
        Tool setting 2 V/DIV., 500 μsec/DIV.
        Vehicle condition Power switch on (IG)