AIR CONDITIONING SYSTEM TERMINALS OF ECU
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CHECK AIR CONDITIONING AMPLIFIER
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Measure the voltage and resistance according to the value(s) in the table below.
Tech Tips
Check from the rear of the connector while it is connected to the air conditioning amplifier.
Terminal No. (Symbols) 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 L76-3 (BLW) - L76-1 (GND) W - W-B Blower motor control signal Engine switch on (IG)
Blower switch LO
Pulse generation
(see waveform 2)
L76-4 (SOL+) - L76-1 (GND) P - W-B A/C compressor operation signal Engine idling
Blower switch LO
A/C switch ON
Pulse generation
(see waveform 1)
L76-5 (IG+) - L76-1 (GND) V - W-B Ignition power supply Engine switch on (IG) 11 to 14 V Engine switch off Below 1 V L76-6 (+B1) - L76-1 (GND) L - W-B Battery power source Always 11 to 14 V L76-7 (+B2) - L76-1 (GND) L - W-B Battery power source Always 11 to 14 V L76-8 (NANO) - L76-1 (GND) G - W-B Ion generator operation signal Engine switch on (IG)
Blower switch LO or more Ion generator switch off
11 to 14 V Engine switch on (IG)
Blower switch LO or more Ion generator switch on
Below 1 V L76-9 (SHOT) - L76-1 (GND) L - W-B Heated steering heater LED operation output signal Engine switch on (IG)
Outer mirror switch (Heated steering wheel switch) off
11 to 14 V Engine switch on (IG)
Outer mirror switch (Heated steering wheel switch) on
Below 1 V L76-12 (BRRG) - Body ground G - Body ground Ground for BUS IC (for Rear) Always Below 1 Ω L76-13 (BURR) - L76-12 (BRRG) R - G BUS IC control signal (for Rear) Engine switch on (IG) Pulse generation L76-14 (BRRB) - L76-12 (BRRG) L - G Power supply for BUS IC (for Rear) Engine switch on (IG) 11 to 14 V L76-17 (SBLW) - L76-1 (GND) G - W-B Blower motor control signal (for Rear) Engine switch on (IG)
Blower switch LO
Pulse generation
(see waveform 3)
L76-21 (LIN3) - L76-1 (GND) R - W-B LIN communication signal
(for Rear A/C switch)
Engine switch on (IG) Pulse generation L76-22 (NAIN) - L76-1 (GND) Y - W-B Ion generator operation signal Engine switch on (IG)
Blower switch LO or more Ion generator switch off
4.75 to 5.25 V Engine switch on (IG)
Blower switch LO or more Ion generator switch on
Below 2.2 V L76-26 (PTC2) - Body ground G - Body ground PTC2 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 L76-27 (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)
Engine switch on (IG) Pulse generation L76-30 (SHSI) - L76-1 (GND) BE - W-B Heated steering heater switch input signal Engine switch on (IG)
Outer mirror switch (Heated steering wheel switch) off
4.75 to 5.25 V Engine 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 Engine switch on (IG)
Outer mirror switch (Heated steering wheel switch) off
4.75 to 5.25 V Engine switch on (IG)
Outer mirror switch (Heated steering wheel switch) on
Below 1 V L76-34 (SHSO) - L76-1 (GND) G - W-B Heated steering heater condition output signal Engine switch on (IG)
Outer mirror switch (Heated steering wheel switch) off
Below 1 V Engine 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 Lo-level CAN bus line - - L77-6 (RGND) - Body ground W-B - Body ground Ground Always Below 1 Ω L77-7 (TSD) - L76-1 (GND) SB - W-B*1
V - W-B*2
Driver side solar sensor signal Engine switch on (IG)
Solar sensor subjected to electric light
0.8 to 4.3 V L77-8 (TSP) - L76-1 (GND) V - W-B*1
SB - W-B*2
Passenger side solar sensor signal Engine switch on (IG)
Solar sensor subjected to electric light
0.8 to 4.3 V L77-9 (TR) - L77-32 (SG-1) Y - L Room temperature sensor signal (for Front) Engine switch on (IG)
Front side interior temperature: 25°C (77°F)
1.8 to 2.2 V L77-11 (SG-3) - Body ground L - Body ground Ground for duct sensor signal (for Passenger side) Always Below 1 Ω L77-12 (SG-2) - Body ground Y - Body ground Ground for duct sensor signal (for Driver side) Always Below 1 Ω L77-21 (TFAL) - L77-12 (SG-2) G - Y Duct sensor signal
(for Driver side)
Engine switch on (IG)
Passenger side duct sensor temperature: 25°C (77°F)
1.8 to 2.2 V Engine 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)
Engine switch on (IG)
Passenger side duct sensor temperature: 25°C (77°F)
1.8 to 2.2 V Engine switch on (IG)
Passenger side duct sensor temperature: 50°C (122°F)
0.8 to 1.2 V L77-32 (SG-1) - Body ground L - Body ground Ground for room temperature sensor (for Front) Always Below 1 Ω z1-1 (BUSG) - Body ground - Ground for BUS IC (for Front) Always Below 1 Ω z1-2 (BUS) - z1-1 (BUSG) - BUS IC control signal (for Front) Engine switch on (IG) Pulse generation z1-3 (BBUS) - z1-1 (BUSG) - Power supply for BUS IC (for Front) Engine switch on (IG) 11 to 14 V z1-5 (SG-10) - Body ground - Ground for evaporator temperature sensor Always Below 1 Ω z1-6 (TE) - z1-5 (SG-10) - Evaporator temperature sensor signal Engine switch on (IG)
Evaporator temperature: 15°C (59°F)
1.4 to 1.8 V z1-8 (BUSG) - Body ground - Ground for BUS IC (for Front) Always Below 1 Ω z1-11 (BUSG) - Body ground - Ground for BUS IC (for Front) Always Below 1 Ω z1-12 (BUS) - z1-11 (BUSG) - BUS IC control signal (for Front) Engine switch on (IG) Pulse generation z1-13 (BBUS) - z1-11 (BUSG) - Power supply for BUS IC (for Front) Engine switch on (IG) 11 to 14 V z1-9 (BUS) - z1-8 (BUSG) - BUS IC control signal (for Front) Engine switch on (IG) Pulse generation z1-10 (BBUS) -z1-8 (BUSG) - Power supply for BUS IC (for Front) Engine switch on (IG) 11 to 14 V
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*1: for LHD
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*2: for RHD
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Using an oscilloscope, check waveform 1.
Compressor and pulley operation signal Item Content Terminal No. (Symbols) L76-4 (SOL+) - L76-1 (GND) Tool Setting 5 V/DIV., 500 μsec./DIV. Condition Engine idling, Blower switch LO, A/C switch ON -
Using an oscilloscope, check waveform 2.
Blower motor control signal Item Content Terminal No. (Symbols) L76-3 (BLW) - L76-1 (GND) Tool Setting 1 V/DIV., 500 μsec./DIV. Condition Engine switch on (IG), Blower switch LO Tech Tips
When the blower level is increased, the duty ratio changes accordingly.
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Using an oscilloscope, check waveform 3.
Rear blower motor control signal Item Content Terminal No. (Symbols) L76-17 (SBLW) - L76-1 (GND) Tool Setting 1 V/DIV., 500 μsec./DIV. Condition Engine switch on (IG), Blower switch LO Tech Tips
When the rear blower level is increased, the duty ratio changes accordingly.
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CHECK FRONT LIGHT ECU (FRONT CONTROLLER)
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Measure the voltage and resistance according to the value(s) in the table below.
Tech Tips
Check from the rear of the connector while it is connected to the front light ECU (Front controller).
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition B14-9 (DGSE) - B14-11 (DGS) B - B Exhaust gas sensor signal (CO, HC) After 30 seconds from engine 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) After 30 seconds from engine 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 Engine switch on (IG) 4.75 to 5.25 V B14-13 (PRS) - B14-14 (SG) L - B Air conditioning pressure sensor signal Refrigerant pressure: Normal 0.73 to 4.48 V Air conditioning pressure sensor signal Refrigerant pressure: Abnormal (less than 0.196 MPa [2.0 kgf/cm2, 28 psi])
Below 0.73 V Air conditioning pressure sensor signal Refrigerant pressure: Abnormal (more than 3.14 MPa [32 kgf/cm2, 455 psi])
4.48 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 Engine switch on (IG)
Ambient temperature: 25°C (77°F)
1.8 to 2.2 V Engine switch on (IG)
Ambient temperature: 40°C (105°F)
1.2 to 1.6 V A52-1 (BATB) - A50-2 (E) P - W-B Power source Always 11 to 14 V A52-5 (ALTB) - A50-2 (E) L - W-B Power source Always 11 to 14 V A50-1 (FMB3) - A50-2 (E) LG - W-B Power source 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 Power source Engine switch on (IG) 11 to 14 V Engine switch off Below 1 V A51-12 (RDEF) - A50-2 (E) W - W-B Rear defogger switch signal Engine switch on (IG)
Rear defogger switch OFF
11 to 14 V Engine switch on (IG)
Rear defogger switch ON
Below 1 V A51-13 (FDEF) - A50-2 (E) L - W-B Window deicer switch signal Engine switch on (IG)
Window deicer switch OFF
11 to 14 V Engine switch on (IG)
Window deicer switch ON
Below 1 V
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CHECK MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)
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Disconnect the DA, L12 and L13 ECU connectors.
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Measure the resistance and voltage according to value(s) in the table below.
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition DA-40 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω DA-40 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω L12-1 (AM2) - DA-40 (GND2) W - W-B Battery power supply Always 11 to 14 V L13-6 (AM1) - DA-40 (GND2) W - W-B Battery power supply Always 11 to 14 V
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CHECK LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)
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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. (Symbols) Wiring Color Terminal Description Condition Specified Condition S62-18 (TSD) - S62-26 (TSB) L - B Rear solar sensor signal Engine switch on (IG) 0.8 to 4.3 V Rear solar sensor subjected to electric light S62-7 (SMOK) - LA-43 (PGND) B - W-B Smoke sensor operation signal Engine switch on (IG)
Rear A/C switch to AUTO
Apply cigarette smoke
4.0 V or higher Engine switch on (IG)
Rear A/C switch to AUTO
No cigarette smoke
Below 1 V S62-5 (RMGV) - LA-43 (PGND) L - W-B Rear magnetic valve operation voltage Engine switch on (IG)
Rear A/C switch ON
Below 1 V Engine switch on (IG)
Rear A/C switch OFF
11 to 14 V
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CHECK REAR DOOR ECU LH
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Measure the voltage and resistance 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 door ECU LH.
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition O15-13 (TRAD) - O15-26 (TRE) V - Y Rear room temperature sensor signal LH Engine switch on (IG)
Rear LH side interior temperature: 25°C (77°F)
1.8 to 2.2 V O14-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω O14-6 (BDR) - O14-1 (GND) L - W-B Battery power supply Always 11 to 14 V O14-11 (CPUB) - O14-1 (GND) R - W-B Battery power supply Always 11 to 14 V
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CHECK REAR DOOR ECU RH
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Measure the voltage and resistance 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 door ECU RH.
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition O2-13 (TRAD) - O2-26 (TRE) V - Y Rear room temperature sensor signal RH Engine switch on (IG)
Rear RH side interior temperature: 25°C (77°F)
1.8 to 2.2 V O3-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω O3-6 (BDR) - O3-1 (GND) L - W-B Battery power supply Always 11 to 14 V O3-11 (CPUB) - O3-1 (GND) R - W-B Battery power supply Always 11 to 14 V
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CHECK MULTI-MEDIA MODULE RECEIVER
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Disconnect the L146 multi-media module receiver connector.
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Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition L146-12 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω L146-17 (+B1) - L146-12 (GND1) R - W-B Battery power source Always 11 to 14 V L146-15 (IG) - L146-12 (GND1) V - W-B Ignition power supply Engine switch on (IG) 11 to 14 V Engine switch off Below 1 V
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CHECK REAR POWER SEAT SWITCH (except for 4-Passenger with Ottoman)
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Disconnect the r2 rear power seat switch connector.
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Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition r2-9 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω r2-14 (B) - r2-9 (E) W - W-B Battery Always 11 to 14 V
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CHECK REAR POWER SEAT SWITCH (for 4-Passenger with Ottoman)
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Disconnect the S15 rear power seat switch connector.
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Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbols) 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 Battery Always 11 to 14 V
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