CLIMATE CONTROL SEAT SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    B004IJUN01

    1. Disconnect the K54 air conditioning amplifier assembly 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.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K54-2 (IG+) - Body ground LA-GR - Body ground Air conditioning amplifier power supply Engine switch off Below 1 V
      K54-2 (IG+) - Body ground LA-GR - Body ground Air conditioning amplifier power supply Engine switch on (IG) 11 to 14 V
      K54-4 (GND) - Body ground W-B - Body ground Air conditioning amplifier ground Always Below 1 Ω

    3. Reconnect the K54 air conditioning amplifier assembly connector.

    4. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K54-24 (LOUT) - Body ground G - Body ground Climate control blower control signal

      • Engine switch on (IG)

      • Refreshing seat switch (for LH) on

        (blower position)

      Pulse generation

      (See waveform)
      K54-23 (ROUT) - Body ground LG - Body ground Climate control blower control signal

      • Engine switch on (IG)

      • Refreshing seat switch (for RH) on

        (blower position)

      Pulse generation

      (See waveform)
      K54-14 (LIN1) - Body ground BE - Body ground Refreshing seat switch signal Engine switch on (IG) Pulse generation

      1. B004NX8N02

        Waveform (Reference):

        Measurement Condition
        Item Content
        Tester Connection

        • K54-24 (LOUT) - Body ground

        • K54-23 (ROUT) - Body ground
        Tool Setting 1 V/DIV., 0.5 ms/DIV.
        Vehicle Condition

        • Engine switch on (IG)

        • Refreshing seat switch on

          (blower position)

  2. REFRESHING SEAT SWITCH

    B004JBLN03

    1. Disconnect the K49 refreshing seat switch 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.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K49-1 (IG) - Body ground LG - Body ground Refreshing seat switch power supply Engine switch off Below 1 V
      K49-1 (IG) - Body ground LG - Body ground Refreshing seat switch power supply Engine switch on (IG) 11 to 14 V
      K49-5 (E) - Body ground W-B - Body ground Refreshing seat switch ground Always Below 1 Ω

    3. Reconnect the K49 refreshing seat switch connector.

    4. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K49-3 (LIN1) - Body ground B - Body ground Refreshing seat switch signal Engine switch on (IG) Pulse generation