SEAT HEATER SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    B002KYUN03

    1. Disconnect the I50 air conditioning amplifier assembly connector.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      I50-1 (IG+) - Body ground SB - Body ground IG power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      I50-14 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      I50-21 (B) - Body ground GR - Body ground Battery power supply Power switch off 11 to 14 V

    3. Reconnect the I50 air conditioning amplifier assembly connector.

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

    5. Check for pulse generation according to the value(s) in the table below.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      I50-16 (SHP+) - Body ground V - Body ground Seat heater (for Front Passenger Side) drive signal

      • Power switch on (IG)

      • Seat heater switch (for Front Passenger Side) on

      		 Below 1 V
      I50-17 (SHD+) - Body ground LG - Body ground Seat heater (for Driver Side) input signal

      • Power switch on (IG)

      • Seat heater switch (for Driver Side) on

      		 Below 1 V
      I50-18 (SHPE) - Body ground* GR - Body ground Seat heater (for Rear RH) input signal

      • Power switch on (IG)

      • Refreshing seat switch (for Rear RH) on

      		 Below 1 V
      I50-36 (SHDE) - Body ground* LG - Body ground Seat heater (for Rear LH) input signal

      • Power switch on (IG)

      • Refreshing seat switch (for Rear LH) on

      		 Below 1 V
      I50-37 (LIN1) - Body ground B - Body ground Seat heater switch signal Power switch on (IG) Pulse generation
      I54-3 (TSR) - I54-7 (SG-3) P - R Seat heater sensor (for Front Passenger Side) input signal

      Power switch off

      (0 to 30°C [32 to 86°F])

      • 0°C(32°F): 23.74 kΩ

      • 30°C(86°F): 8.441 kΩ
      I54-4 (TSL) - I54-8 (SG-6) W - G Seat heater sensor (for Driver Side) input signal

      Power switch off

      (0 to 30°C [32 to 86°F])

      • 0°C(32°F): 23.74 kΩ

      • 30°C(86°F): 8.441 kΩ
      I54-5 (TFAR) - I54-23 (SG-7)* R - W Seat heater sensor (for Rear RH) input signal

      Power switch off

      (0 to 30°C [32 to 86°F])

      • 0°C(32°F): 23.74 kΩ

      • 30°C(86°F): 8.441 kΩ
      I54-7 (SG-3) - Body ground R - Body ground Ground for seat heater sensor (for Front Passenger Side) Always Below 1 Ω
      I54-8 (SG-6) - Body ground G - Body ground Ground for seat heater sensor (for Driver Side) Always Below 1 Ω
      I54-20 (TFAL) - I54-23 (SG-7)* G - W Seat heater sensor (for Rear LH) input signal

      Power switch off

      (0 to 30°C [32 to 86°F])

      • 0°C(32°F): 23.74 kΩ

      • 30°C(86°F): 8.441 kΩ
      I54-16 (RLIN) - Body ground* V - Body ground Refreshing seat switch signal (LIN) Power switch on (IG) Pulse generation (See waveform)
      I54-23 (SG-7) - Body ground* W - Body ground Ground for seat heater sensor (for Rear LH and RH) Always Below 1 Ω

      • *: w/ Rear Seat Heater

    6. B002ICYN01

      Wavefrom:

      Item Content
      Terminal No. I54-16 (RLIN) - Body ground*
      Tool Setting 2 V/DIV., 20 μs/DIV.
      Vehicle Condition Power switch on (IG)

      • *: w/ Rear Seat Heater

  2. CHECK AIR CONDITIONING CONTROL ASSEMBLY

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  3. REFRESHING SEAT SWITCH (w/ Rear Seat Heater)


    1. B002IZMN02

      Disconnect the I162 refreshing seat switch connector.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      I162-1 (E) - Body ground BR - Body ground Ground Always Below 1 Ω
      I162-5 (IG+) - Body ground R - Body ground IG power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V

    3. Reconnect the I162 refreshing seat switch connector.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      I162-3 (RLIN) - Body ground V - Body ground Refreshing seat switch signal (LIN) Power switch on (IG) Pulse generation (See waveform)
    5. B002HSYN01

      Wavefrom:

      Item Content
      Terminal No. I162-3 (RLIN) - Body ground
      Tool Setting 2 V/DIV., 20 μs/DIV.
      Vehicle Condition Power switch on (IG)