SEAT HEATER SYSTEM TERMINALS OF ECU


  1. REAR SEAT CLIMATE CONTROL ECU LH (w/ Rear Seat Heater)

    B006P8RE05

    1. Disconnect the Y24 rear seat climate control ECU LH 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
      Y24-3 (GND) - Body ground W - Body ground Ground Always Below 1 Ω
      Y24-12 (IG) - Body ground B - Body ground IG power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      Y24-13 (+B) - Body ground P - Body ground Battery power supply Always 11 to 14 V

    3. Reconnect the Y24 rear seat climate control ECU LH connector.

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

    5. w/ Memory:


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

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        Y24-1 (IND1) - Body ground LG - Body ground Seat heater indicator signal

        • Engine switch on (IG)

        • Heated and ventilated seat main switch on and set to seat heater position

        		 Pulse generation
        Y24-7 (HSWM) - Body ground L - Body ground Heated and ventilated seat main switch signal

        • Engine switch on (IG)

        • Heated and ventilated seat main switch off

        		 11 to 14 V

        • Engine switch on (IG)

        • Heated and ventilated seat main switch on

        		 Below 1 V
        Y24-11 (HTR+) - Y24-2 (HTR-) Y - L Seat heater drive signal

        • Engine switch on (IG)

        • Heated and ventilated seat main switch off

        		 Below 1 V

        • Engine switch on (IG)

        • Heated and ventilated seat main switch on and set to seat heater position

        		 11 to 14 V
        Y24-18 (HSWS) - Body ground G - Body ground Heated and ventilated seat main switch volume signal

        • Engine switch on (IG)

        • Heated and ventilated seat main switch on and set to seat heater position

        		 2.5 to 5 V
        Y24-19 (HSW5) - Y24-20 (HSWG) V - B Heated and ventilated seat main switch output

        • Engine switch on (IG)

        • Heated and ventilated seat main switch off

        		 Below 1 V

        • Engine switch on (IG)

        • Heated and ventilated seat main switch on

        		 4.5 to 5.5 V

    6. w/o Memory:


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

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        Y24-1 (IND1) - Body ground LG - Body ground Seat heater indicator signal

        • Engine switch on (IG)

        • Seat heater switch on (LO)

        		 Pulse generation
        Y24-24 (HSWI) - Body ground R - Body ground Seat heater indicator signal

        • Engine switch on (IG)

        • Seat heater switch on (HI)

        		 Pulse generation
        Y24-11(HTR+) - Y24-2(HTR-) Y - L Seat heater drive signal

        • Engine switch on (IG)

        • Seat heater switch off

        		 Below 1 V

        • Engine switch on (IG)

        • Seat heater switch on

        		 11 to 14 V
        Y24-7 (HSWM) - Body ground L - Body ground Seat heater switch signal

        • Engine switch on (IG)

        • Seat heater switch off

        		 11 to 14 V

        • Engine switch on (IG)

        • Seat heater switch on

        		 Below 1 V

  2. REAR SEAT CLIMATE CONTROL ECU RH (w/ Rear Seat Heater)

    B006P8RE06

    1. Disconnect the Y4 rear seat climate control ECU RH 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
      Y4-3 (GND) - Body ground W - Body ground Ground Always Below 1 Ω
      Y4-12 (IG) - Body ground B - Body ground IG power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      Y4-13 (+B) - Body ground P - Body ground Battery power supply Always 11 to 14 V

    3. Reconnect the Y4 rear seat climate control ECU RH connector.

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

    5. w/ Memory:


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

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        Y4-1 (IND1) - Body ground LG - Body ground Seat heater indicator signal

        • Engine switch on (IG)

        • Heated and ventilated seat main switch on and set to seat heater position

        		 Pulse generation
        Y4-7 (HSWM) - Body ground L - Body ground Heated and ventilated seat main switch signal

        • Engine switch on (IG)

        • Heated and ventilated seat main switch off

        		 11 to 14 V

        • Engine switch on (IG)

        • Heated and ventilated seat main switch on

        		 Below 1 V
        Y4-11 (HTR+) - Y4-2 (HTR-) Y - L Seat heater drive signal

        • Engine switch on (IG)

        • Heated and ventilated seat main switch off

        		 Below 1 V

        • Engine switch on (IG)

        • Heated and ventilated seat main switch on and set to seat heater position

        		 11 to 14 V
        Y4-18 (HSWS) - Body ground G - Body ground Heated and ventilated seat main switch volume signal

        • Engine switch on (IG)

        • Heated and ventilated seat main switch on and set to seat heater position

        		 2.5 to 5 V
        Y4-19 (HSW5) - Y4-20 (HSWG) V - B Heated and ventilated seat main switch output

        • Engine switch on (IG)

        • Heated and ventilated seat main switch off

        		 Below 1 V

        • Engine switch on (IG)

        • Heated and ventilated seat main switch on

        		 4.5 to 5.5 V

    6. w/o Memory:


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

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        Y4-1 (IND1) - Body ground LG - Body ground Seat heater indicator signal

        • Engine switch on (IG)

        • Seat heater switch on (LO)

        		 Pulse generation
        Y4-24 (HSWI) - Body ground R - Body ground Seat heater indicator signal

        • Engine switch on (IG)

        • Seat heater switch on (HI)

        		 Pulse generation
        Y4-11(HTR+) - Y4-2(HTR-) Y - L Seat heater drive signal

        • Engine switch on (IG)

        • Seat heater switch off

        		 Below 1 V

        • Engine switch on (IG)

        • Seat heater switch on

        		 11 to 14 V
        Y4-7 (HSWM) - Body ground L - Body ground Seat heater switch signal

        • Engine switch on (IG)

        • Seat heater switch off

        		 11 to 14 V

        • Engine switch on (IG)

        • Seat heater switch on

        		 Below 1 V