AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER

    A01H2C6E01

    1. Disconnect the L76, L77 and z1 air conditioning amplifier connectors.

    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
      L76-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L76-2 (FGND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L76-5 (IG+) - L76-1 (GND) V - W-B Ignition power supply Power switch ON (IG) 11 to 14 V
      Power switch OFF Below 1 V
      L76-6 (+B1) - L76-1 (GND) L - W-B Auxiliary battery power supply Always 11 to 14 V
      L76-7 (+B2) - L76-1 (GND) L - W-B Auxiliary battery power supply Always 11 to 14 V
      L76-12 (BRRG) - Body ground G - Body ground Ground for BUS IC (for Rear) Always Below 1 Ω
      L76-14 (BRRB) - L76-12 (BRRG) L - G Power supply for BUS IC (for Rear) Power switch ON (IG) 11 to 14 V
      L77-6 (RGND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L77-32 (SG-1) - Body ground L - Body ground Ground for room temperature sensor (for Front) Always Below 1 Ω
      z1-1 (BFLG) - Body ground - Ground for BUS IC (for Front) Always Below 1 Ω
      z1-3 (BFLB) - z1-1 (BFLG) - Power supply for BUS IC (for Front) Power switch ON (IG) 11 to 14 V
      z1-6 (SG-6) - Body ground - Ground for evaporator temperature sensor Always Below 1 Ω
      z1-8 (BFRG) - Body ground - Ground for BUS IC (for Front) Always Below 1 Ω
      z1-10 (BFRB) -z1-8 (BFRG) - Power supply for BUS IC (for Front) Power switch ON (IG) 11 to 14 V
      z1-11 (BUSG) - Body ground - Ground for BUS IC (for Front) Always Below 1 Ω
      z1-13 (BUSB) -z1-11 (BUSG) - Power supply for BUS IC (for Front) Power switch ON (IG) 11 to 14 V

    3. Reconnect the L76, L77 and z1 air conditioning amplifier connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      L76-3 (BLW) - L76-1 (GND) W - W-B Blower motor control signal

      Power switch ON (IG)

      Blower switch LO

      Pulse generation

      (see waveform 1)
      L76-8 (NANO) - L76-1 (GND) G - W-B Ion generator operation signal

      Power switch ON (IG)

      Blower switch LO or higher

      Ion generator switch off

      		 11 to 14 V

      Power switch ON (IG)

      Blower switch LO or higher

      Ion generator switch on

      		 Below 1 V
      L76-9 (SHOT) - L76-1 (GND) L - W-B Heated steering heater LED operation output signal

      Power switch ON (IG)

      Outer mirror switch (Heated steering wheel switch) off

      		 Below 1 V

      Power switch ON (IG)

      Outer mirror switch (Heated steering wheel switch) on

      		 11 to 14 V
      L76-13 (BURR) - L76-12 (BRRG) R - G BUS IC control signal (for Rear) Power switch ON (IG) Pulse generation
      L76-17 (SBLW) - L76-1 (GND) G - W-B Blower motor control signal (for Rear)

      Power switch ON (IG)

      Blower switch LO

      Pulse generation

      (see waveform 2)
      L76-21 (LIN3) - L76-1 (GND) R - W-B

      LIN communication signal

      (for Rear A/C switch)

      		 Power switch ON (IG) Pulse generation
      L76-22 (NAIN) - L76-1 (GND) Y - W-B Ion generator operation signal

      Power switch ON (IG)

      Blower switch LO or higher

      Ion generator switch off

      		 4.75 to 5.25 V

      Power switch ON (IG)

      Blower switch LO or higher

      Ion generator switch on

      		 Below 2.2 V
      L76-27 (PTC1) - Body ground W - Body ground PTC1 heater relay operation signal

      Engine idling

      Set temperature: MAX HOT

      Engine coolant temperature: Below 65°C (149°F)

      Ambient temperature: Below 10°C (50°F)

      Blower switch OFF → LO

      		 Below 1 V → 11 to 14 V
      L76-28 (LIN1) - L76-1 (GND) R - W-B

      LIN communication signal

      (for Infrared ray sensor)

      		 Power switch ON (IG) Pulse generation
      L76-30 (SHSI) - L76-1 (GND) BE - W-B Heated steering heater switch input signal

      Power switch ON (IG)

      Outer mirror switch (Heated steering wheel switch) off

      		 4.75 to 5.25 V

      Power switch ON (IG)

      Outer mirror switch (Heated steering wheel switch) on

      		 Below 1 V
      L76-31 (SHIN) - L76-1 (GND) P - W-B Heated steering heater condition output signal

      Power switch ON (IG)

      Outer mirror switch (Heated steering wheel switch) off

      		 4.75 to 5.25 V

      Power switch ON (IG)

      Outer mirror switch (Heated steering wheel switch) on

      		 Below 1 V
      L77-32 (SG-1) - Body ground L - Body ground Ground for room temperature sensor (for Front) Always Below 1 Ω
      L76-34 (SHSO) - L76-1 (GND G - W-B Heated steering heater condition output signal

      Power switch ON (IG)

      Outer mirror switch (Heated steering wheel switch) off

      		 Below 1 V

      Power switch ON (IG)

      Outer mirror switch (Heated steering wheel switch) on

      		 11 to 14 V
      L76-35 (PTC3) - Body ground L - Body ground PTC3 heater relay operation signal

      Engine idling

      Set temperature: MAX HOT

      Engine coolant temperature: Below 65°C (149°F)

      Ambient temperature: Below 10°C (50°F)

      Blower switch OFF → LO

      		 Below 1 V → 11 to 14 V
      L77-3 (CANH) R CAN communication signal - -
      L77-4 (CANL) G CAN communication signal - -
      L77-5 (S5-1) - Body ground R - Body ground Power supply for room temperature sensor signal (for Front) Power switch ON (IG) 4.5 to 5.5 V
      L77-7 (TSD) - L76-1 (GND) SB*1 - W-B Driver side solar sensor signal

      Power switch ON (IG)

      Solar sensor subjected to electric light

      		 0.8 to 4.3 V
      V*2 - W-B
      L77-8 (TSP) - L76-1 (GND) V*1 - W-B Passenger side solar sensor signal

      Power switch ON (IG)

      Solar sensor subjected to electric light

      		 0.8 to 4.3 V
      SB*2 - W-B
      L77-9 (TR) - L77-32 (SG-1) Y - L Room temperature sensor signal (for Front)

      Power switch ON (IG)

      Front side interior temperature: 25°C (77°F)

      		 1.8 to 2.2 V
      L77-21 (TFAL) - L77-12 (SG-2) G - Y

      Duct sensor signal

      (for Driver side)

      Power switch ON (IG)

      Passenger side duct sensor temperature: 25°C (77°F)

      		 1.8 to 2.2 V

      Power switch ON (IG)

      Passenger side duct sensor temperature: 50°C (122°F)

      		 0.8 to 1.2 V
      L77-22 (TFAR) - L77-11 (SG-3) R - L

      Duct sensor signal

      (for Passenger side)

      Power switch ON (IG)

      Passenger side duct sensor temperature: 25°C (77°F)

      		 1.8 to 2.2 V

      Power switch ON (IG)

      Passenger side duct sensor temperature: 50°C (122°F)

      		 0.8 to 1.2 V
      L77-31 (RH) - L77-32 (SG-1) B - L Humidity sensor signal

      Power switch ON (IG)

      Front side interior temperature: 25°C (77°F)

      Vehicle interior humidity: 40%

      		 1.61 to 2.24 V

      Power switch ON (IG)

      Front side interior temperature: 25°C (77°F)

      Vehicle interior humidity: 60%

      		 2.26 to 2.66 V
      z1-2 (BUFL) - z1-1 (BFLG) - BUS IC control signal (for Front) Power switch ON (IG) Pulse generation
      z1-7 (TE) - z1-6 (SG-6) - Evaporator temperature sensor signal

      Power switch ON (IG)

      Evaporator temperature: 15°C (59°F)

      		 1.4 to 1.8 V
      z1-9 (BUGL) - z1-8 (BFRG) - BUS IC control signal (for Front) Power switch ON (IG) Pulse generation
      z1-12 (BUS) - z1-11 (BUSG) - BUS IC control signal (for Front) Power switch ON (IG) Pulse generation

      Tech Tips


      • *1: for LHD

      • *2: for RHD

    5. A01H18GE05

      Using an oscilloscope, check waveform 1.

      Blower motor control signal
      Item Content
      Terminal No. (Symbol) L76-3 (BLW) - L76-1 (GND)
      Tool Setting 1 V/DIV., 500 μsec./DIV.
      Condition Power switch ON (IG), Blower switch LO

      Tech Tips

      When the blower level is increased, the duty ratio changes accordingly.

    6. A01H18GE05

      Using an oscilloscope, check waveform 2.

      Rear blower motor control signal
      Item Content
      Terminal No. (Symbol) L76-17 (SBLW) - L76-1 (GND)
      Tool Setting 1 V/DIV., 500 μsec./DIV.
      Condition Power switch ON (IG), Blower switch LO

      Tech Tips

      When the rear blower level is increased, the duty ratio changes accordingly.

  2. CHECK FRONT CONTROLLER

    A01H15EE07

    1. Disconnect the A50, A52 and B14 front controller connectors.

    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
      B14-14 (SG) - Body ground B - Body ground Ground for pressure sensor Always Below 1 Ω
      A52-1 (BATB) - A50-2 (E) P - W-B Auxiliary battery power supply Always 11 to 14 V
      A52-5 (ALTB) - A50-2 (E) L - W-B Auxiliary battery power supply Always 11 to 14 V
      A50-1 (FMB3) - A50-2 (E) LG - W-B Auxiliary battery power supply Always 11 to 14 V
      A50-2 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A50-5 (FMIG) - A50-2 (E) Y - W-B Ignition power supply Power switch ON (IG) 11 to 14 V
      Power switch OFF Below 1 V

    3. Reconnect the A50, A52 and B14 front controller connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      B14-9 (DGSE) - B14-11 (DGS) B - B Exhaust gas sensor signal (CO, HC) 30 seconds after from power switch ON (IG) and the sensor is exposed to the exhaust gas 1.0 to 4.5 V
      B14-9 (DGSE) - B14-10 (DGS1) B - L Exhaust gas sensor signal (Nox) 30 seconds after from power switch ON (IG) and the sensor is exposed to the exhaust gas 1.0 to 4.5 V
      B14-12 (S5) - A50-2 (E) B - W-B Power supply for pressure sensor Power switch ON (IG) 4.5 to 5.5 V
      B14-13 (PRS) - B14-14 (SG) L - B Air conditioning pressure sensor signal Refrigerant pressure: Normal 0.7 to 4.8 V
      Air conditioning pressure sensor signal

      Refrigerant pressure: Abnormal (less than 0.196 MPa [2.0 kgf/cm2, 28 psi])

      		 Below 0.7 V
      Air conditioning pressure sensor signal

      Refrigerant pressure: Abnormal (more than 3.14 MPa [32 kgf/cm2, 455 psi])

      		 4.8 V or higher
      B14-14 (SG) - Body ground B - Body ground Ground for pressure sensor Always Below 1 Ω
      B14-19 (TME) - Body ground L - Body ground Ground for ambient temperature sensor signal Always Below 1 Ω
      B14-20 (TM) - B14-19 (TME) B - L Ambient temperature sensor signal

      Power switch ON (IG)

      Ambient temperature: 25°C (77°F)

      		 1.8 to 2.2 V

      Power switch ON (IG)

      Ambient temperature: 40°C (105°F)

      		 1.2 to 1.6 V
      A51-12 (RDEF) - A50-2 (E) W - W-B Rear defogger switch signal

      Power switch ON (IG)

      Rear defogger switch OFF

      		 11 to 14 V

      Power switch ON (IG)

      Rear defogger switch ON

      		 Below 1 V
      A51-13 (FDEF) - A50-2 (E) L - W-B Window deicer switch signal

      Power switch ON (IG)

      Window deicer switch OFF

      		 11 to 14 V

      Power switch ON (IG)

      Window deicer switch ON

      		 Below 1 V

  3. CHECK HYBRID VEHICLE CONTROL ECU

    A01GZ7UE05

    1. Measure the voltage and waveform according to the value(s) in the table below.

      Tech Tips

      Check from the rear of the connector while it is connected to the hybrid vehicle control ECU.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E58-21 (ITE) - A77-7 (E1) R - W-B Compressor operation signal

      Power switch ON (READY)

      A/C switch OFF

      Pulse generation

      (see waveform)
      E58-30 (CLK) - A77-7 (E1) BR - W-B Compressor operation signal

      Power switch ON (READY)

      A/C switch OFF

      Pulse generation

      (see waveform)
      E58-31 (STB) - A77-7 (E1) L - W-B Compressor operation signal

      Power switch ON (READY)

      A/C switch OFF

      Pulse generation

      (see waveform)
      E58-32 (ETI) - A77-7 (E1) B - W-B Compressor operation signal

      Power switch ON (READY)

      A/C switch OFF

      Pulse generation

      (see waveform)
      A77-5 (WP) - A77-7 (E1) B - W-B Heater water pump operation signal Power switch ON (READY) Below 2 V
      A76-15 (CANH) Y CAN communication signal - -
      A76-16 (CANL) L CAN communication signal - -
    2. A01GY9LE03

      Using an oscilloscope, check waveform.

      Compressor operation signal
      Item Content
      Terminal No. (Symbol)

      • CH1: E58-21 (ITE) - A77-7 (E1)

      • CH2: E58-30 (CLK) - A77-7 (E1)

      • CH3: E58-31 (STB) - A77-7 (E1)

      • CH4: E58-32 (ETI) - A77-7 (E1)
      Tool Setting 10 V/DIV., 100 msec./DIV.
      Condition

      Power switch ON (READY)

      A/C switch OFF

      Tech Tips

      The waveform varies depending on the compressor operation signal.

  4. CHECK MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

    A01GZ5CE06

    1. Disconnect the DA, L12 and L13 ECU connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      DA-40 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L12-1 (AM2) - DA-40 (GND2) W - W-B Auxiliary battery power supply Always 11 to 14 V
      L13-6 (AM1) - DA-40 (GND2) W - W-B Auxiliary battery power supply Always 11 to 14 V

  5. CHECK LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

    A01GZ5CE02

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

      Tech Tips

      Check from the rear of the connector while it is connected to the rear junction block ECU.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      S62-5 (RMGV) - LA-43 (PGND) L - W-B Rear magnetic valve operation voltage

      Power switch ON (IG)

      Rear A/C switch ON

      		 Below 1 V

      Power switch ON (IG)

      Rear A/C switch OFF

      		 11 to 14 V
      S62-7 (SMOK) - LA-43 (PGND)* B - W-B Smoke sensor operation signal

      Power switch ON (IG)

      Rear A/C switch to AUTO

      Apply cigarette smoke

      		 4.0 V or higher

      Power switch ON (IG)

      Rear A/C switch to AUTO

      No cigarette smoke

      		 Below 1 V
      S62-18 (TSD) - S62-26 (TSB)* L - B Rear solar sensor signal Power switch ON (IG) 0.8 to 4.3 V
      Rear solar sensor subjected to electric light
      S62-25 (RRTE) - LA-51 (SSRE) SB - V Rear evaporator temperature sensor signal

      Power switch ON (IG)

      Rear evaporator temperature: 15°C (59°F)

      		 11 to 14 V

      • *: w/ Rear Cooler

  6. CHECK REAR DOOR ECU LH

    A01H0O0E09

    1. Disconnect the O14 rear door ECU LH 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
      O14-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      O14-6 (BDR) - O14-1 (GND) L - W-B Auxiliary battery power supply Always 11 to 14 V
      O14-11 (CPUB) - O14-1 (GND) R - W-B Auxiliary battery power supply Always 11 to 14 V

    3. Reconnect the O14 rear door ECU LH connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      O15-13 (TRAD) - O15-26 (TRE) V - Y Rear room temperature sensor signal LH

      Power switch ON (IG)

      Rear LH side interior temperature: 25°C (77°F)

      		 1.8 to 2.2 V

  7. CHECK REAR DOOR ECU RH

    A01H0O0E08

    1. Disconnect the O3 rear door ECU RH 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
      O3-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      O3-6 (BDR) - O3-1 (GND) L - W-B Auxiliary battery power supply Always 11 to 14 V
      O3-11 (CPUB) - O3-1 (GND) R - W-B Auxiliary battery power supply Always 11 to 14 V

    3. Reconnect the O3 rear door ECU RH connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      O2-13 (TRAD) - O2-26 (TRE) V - Y Rear room temperature sensor signal RH

      Power switch ON (IG)

      Rear RH side interior temperature: 25°C (77°F)

      		 1.8 to 2.2 V

  8. CHECK MULTI-MEDIA MODULE RECEIVER

    A01GW32E26

    1. Disconnect the L164 multi-media module receiver 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
      L164-12 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L164-17 (+B1) - L164-12 (GND1) R - W-B Auxiliary battery power source Always 11 to 14 V
      L164-15 (IG) - L164-12 (GND1) V - W-B Ignition power supply Power switch ON (IG) 11 to 14 V
      Power switch OFF Below 1 V

  9. CHECK REAR POWER SEAT SWITCH (except for 4-Passenger with Ottoman)

    A01GYACE06

    1. Disconnect the z54 rear power 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
      z54-9 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      z54-14 (B) - z54-9 (E) W - W-B Auxiliary battery power source Always 11 to 14 V

  10. CHECK REAR POWER SEAT SWITCH (for 4-Passenger with Ottoman)

    A01H0ULE01

    1. Disconnect the S15 rear power 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
      S15-1 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      S15-8 (B) - S15-1 (E) W - W-B Auxiliary battery power source Always 11 to 14 V