CLIMATE CONTROL SEAT SYSTEM TERMINALS OF ECU

  1. AIR CONDITIONING AMPLIFIER

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

      E124486E43

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      G12-6 (SG-5) - Body ground

      R - Body ground

      Ground

      Always

      Below 1 Ω

      G12-8 (S5-2) - Body ground

      SB - Body ground

      Power supply

      Engine switch on (IG)

      4.5 to 5.5 V

      G12-9 (ROUT) - Body ground

      LG - Body ground

      Output climate control signal (Front passenger side)

      Engine switch on (IG)

      Refreshing seat switch RH blower side level 3

      Pulse generation

      (see waveform 1)

      G12-10 (LOUT) - Body ground

      V - Body ground

      Output climate control signal (Driver side)

      Engine switch on (IG)

      Refreshing seat switch LH blower side level 3

      Pulse generation

      (see waveform 1)

      G12-15 (SW 5) - Body ground

      W - Body ground

      Input climate control signal (Front passenger side)

      Engine switch on (IG)

      Refreshing seat switch RH level 0

      4.5 to 5.5 V

      Engine switch on (IG)

      Refreshing seat switch RH blower side level 3

      Below 1 V

      G12-16 (SW 4) - Body ground

      V - Body ground

      Input climate control signal (Driver side)

      Engine switch on (IG)

      Refreshing seat switch LH level 0

      4.5 to 5.5 V

      Engine switch on (IG)

      Refreshing seat switch LH blower side level 3

      Below 1 V

      G13-31 (S5-4) - Body ground

      V - Body ground

      Power supply

      Engine switch on (IG)

      4.5 to 5.5 V

      G13-35 (SG-4) - Body ground

      G - Body ground

      Ground

      Always

      Below 1 Ω

      If the result is not as specified, the air conditioning amplifier may have a malfunction.

      1. B316287N01

        Using an oscilloscope, check waveform 1.

        Table 1. Waveform 1 (Reference)

        Item

        Content

        Terminal No. (Symbol)

        G12-9 (ROUT) - Body ground

        G12-10 (LOUT) - Body ground

        Tool Setting

        2 V/DIV., 500 μsec/DIV.

        Condition

        Engine switch on (IG)

        Refreshing seat switch blower side level 3