SEAT HEATER SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    A000OPKE02

    1. Disconnect the N78 air conditioning amplifier assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      N78-6 (+B1) - Body ground W - Body ground Power source (Back-up) Always 11 to 14 V
      N78-5 (IG+) - Body ground L - Body ground Power source (IG) Power switch on (IG) 11 to 14 V
      N78-1 (GND) - Body ground W-B - Body ground 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 N78 air conditioning amplifier assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      N157-34 (SG-3) - Body ground GR - Body ground Ground Always Below 1 Ω
      N157-35 (SG-4) - Body ground B - Body ground Ground Always Below 1 Ω
      N78-20 (LIN1) - N78-1 (GND) R - W-B LIN communication signal Power switch on (IG) Pulse generation
      N78-21 (RLIN) - N78-1 (GND)* P - W-B LIN communication signal Power switch on (IG) Pulse generation

      • *: w/ Rear Seat Heater

  2. CHECK REAR CONTROL SWITCH (w/ Rear Seat Heater)

    A000RZPE02

    1. Disconnect the Z1 rear control switch connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      Z1-1 (+B) - Body ground R - Body ground Power source (Back-up) Always 11 to 14 V
      Z1-7 (IG+) - Body ground L - Body ground Power source (IG) Power switch on (IG) 11 to 14 V
      Z1-5 (E) - Body ground W-B - Body ground 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 Z1 rear control switch connector.

    4. Measure the waveform according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      Z1-9 (RLIN) - Z1-5 (E) P - W-B LIN communication signal Power switch on (IG) Pulse generation

  3. CHECK REFRESHING SEAT SWITCH

    A000OFIE02

    1. Disconnect the N72 refreshing seat switch connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      N72-1 (IG) - Body ground LG - Body ground Power source (IG) Power switch on (IG) 11 to 14 V
      N72-4 (E) - Body ground W-B - Body ground 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 N72 refreshing seat switch connector.

    4. Measure the waveform according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      N72-7 (SW) - N72-4 (E) R - W-B LIN communication signal Power switch on (IG) Pulse generation