SEAT HEATER SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (w/o Rear Power Seat)


    1. Disconnect the I77 air conditioning amplifier assembly connector.

      A01EY8QE17

    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
      I77-1 (IG+) - I77-14 (GND) B - W-B Power source (IG) Engine switch on (IG) 11 to 14 V
      I77-1 (IG+) - I77-14 (GND) B - W-B Power source (IG) Engine switch off Below 1 V
      I77-21 (B) - I77-14 (GND) Y - W-B Battery power supply Always 11 to 14 V
      I77-14 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the I77 air conditioning amplifier assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I77-15 (HTR1) - I77-14 (GND) P - W-B Rear seat heater signal Engine switch on (IG), Seat heater switch (for RH) off 11 to 14 V
      I77-15 (HTR1) - I77-14 (GND) P - W-B Rear seat heater signal Engine switch on (IG), Seat heater switch (for RH) on Below 2.2 V
      I77-16 (HTR2) - I77-14 (GND) L - W-B Rear seat heater signal Engine switch on (IG), Seat heater switch (for LH) off 11 to 14 V
      I77-16 (HTR2) - I77-14 (GND) L - W-B Rear seat heater signal Engine switch on (IG), Seat heater switch (for LH) on Below 2.2 V
      I203-12 (SVP1) - I77-14 (GND) V - W-B Rear seat heater indicator signal Engine switch on (IG), Seat heater switch (for RH) off 11 to 14 V
      I203-12 (SVP1) - I77-14 (GND) V - W-B Rear seat heater indicator signal Engine switch on (IG), Seat heater switch (for RH) on Below 1 V
      I203-13 (SVD1) - I77-14 (GND) G - W-B Rear seat heater indicator signal Engine switch on (IG), Seat heater switch (for LH) off 11 to 14 V
      I203-13 (SVD1) - I77-14 (GND) G - W-B Rear seat heater indicator signal Engine switch on (IG), Seat heater switch (for LH) on Below 1 V
      I77-24 (SW1) - I77-14 (GND) W - W-B Rear seat heater switch signal Engine switch on (IG), Seat heater switch (for RH) on 11 to 14 V
      I77-24 (SW1) - I77-14 (GND) W - W-B Rear seat heater switch signal Engine switch on (IG), Seat heater switch (for RH) off Below 1 V
      I203-21 (SW2) - I77-14 (GND) R - W-B Rear seat heater switch signal Engine switch on (IG), Seat heater switch (for LH) on 11 to 14 V
      I203-21 (SW2) - I77-14 (GND) R - W-B Rear seat heater switch signal Engine switch on (IG), Seat heater switch (for LH) off Below 1 V