AIR CONDITIONING SYSTEM (for Manual Air Conditioning System) > TERMINALS OF ECU

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CHECK AIR CONDITIONING AMPLIFIER

E176186E01

HINT:
Check from the rear of the connector while it is connected to the air conditioning amplifier.


Standard 
Terminal No. (Symbol)
Wiring Color
Terminal Description
Condition
Specified Condition
D16-4 (FLOQ) - D16-10 (SG-2)
SB - GR
Flow sensor signal
Engine idling
A/C switch off
3.76 to 4.7 V
Engine idling
A/C switch on
0.3 to 3.76 V
D16-7 (S5-3) - D16-24 (GND)
L - W-B
Power supply for pressure sensor and flow sensor
Ignition switch: ON
4.75 to 5.25 V
D16-8 (TX+) - D16-24 (GND)
LG - W-B
Hi-level CAN bus line
Ignition switch: ON
Pulse generation
(see waveform 1)
D16-9 (TX-) - D16-24 (GND)
W - W-B
Low-level CAN bus line
Ignition switch: ON
Pulse generation
(see waveform 2)
D16-10 (SG-2) - Body ground
GR - Body ground
Ground for pressure sensor and flow sensor
Always
Below 1.0 Ω
D16-12 (PRE) - D16-23 (SG-1)
P - V
Air conditioner pressure sensor signal
Refrigerant pressure: normal
0.70 to 4.69 V
D16-12 (PRE) - D16-23 (SG-1)
P - V
Air conditioner pressure sensor signal
Refrigerant pressure: abnormal
(less than 0.176 MPa [1.8 kgf/cm2] or more than 3.025 MPa [30.9 kgf/cm2])
Below 0.70 V or 4.69 V or more
D16-13 (SOL+) - D16-24 (GND)
R - W-B
A/C compressor operation signal
Engine idling
Blower switch: 1
A/C switch: on
Pulse generation
(see waveform 3)
D16-14 (IG+) - D16-24 (GND)
Y - W-B
Ignition power supply
Ignition switch: ON
11 to 14 V
Ignition switch: off
Below 1 V
D16-15 (MGC) - D16-24 (GND)
B - W-B
A/C compressor magnetic clutch operation signal
Engine idling
A/C switch: on
Blower switch: 0 → 1
Below 1 V → 11 to 14 V
Engine idling
A/C switch: off
Blower switch: 0 → 1
Below 1 V → Below 1 V
D16-21 (SBLW) - D16-24 (GND)
G - W-B
Blower motor control signal
Ignition switch: ON
Blower switch: 0 → 1
11 to 14 V → Below 1 V
D16-22 (TE) - D16-10 (SG-2)
Y - GR
Front evaporator temperature sensor signal
Ignition switch: ON
Evaporator temperature: 0°C (32°F)
2.0 to 2.4 V
Ignition switch: ON
Evaporator temperature: 15°C (59°F)
1.4 to 1.8 V
D16-23 (SG-1) - Body ground
V - Body ground
Ground for front evaporator temperature sensor
Always
Below 1.0 Ω
D16-24 (GND) - Body ground
W-B - Body ground
Ground for main power supply
Always
Below 1.0 Ω
D16-27 (A/C) - D16-24 (GND)
SB - W-B
A/C switch signal
Ignition switch: ON
Defroster: off
A/C switch: off→ on
Below 1 V → 11 to 14 V
Defroster mode detection switch signal
Ignition switch: ON
A/C switch: off
Defroster: off→ on
Below 1 V → 11 to 14 V
D16-28 (LED) - Body ground
L - Body ground
A/C switch indicator signal
Engine idling
A/C switch: on
Blower switch: 0 → 1
11 to 14 V → Below 4 V
D17-9 (PTC1)* - D16-24 (GND)
G - W-B
PTC heater relay operation signal
Engine idling
No. 3 heater control knob: Max Hot
Engine coolant temperature: Below 65°C (149°F)
Ambient temperature: Below 10°C (50°F)
Blower switch: 0 → 1
Waiting time: 10 seconds
Below 1 V → 11 to 14 V
D17-10 (PTC2)* - D16-24 (GND)
W - W-B
PTC heater relay operation signal
Engine idling
No. 3 heater control knob: Max Hot
Engine coolant temperature: Below 65°C (149°F)
Ambient temperature: Below 10°C (50°F)
Blower switch: 0 → 1
Waiting time: 20 seconds
Below 1 V → 11 to 14 V
D17-12 (PTC3)* - D16-24 (GND)
L - W-B
PTC heater relay operation signal
Engine idling
No. 3 heater control knob: Max Hot
Engine coolant temperature: Below 65°C (149°F)
Ambient temperature: Below 10°C (50°F)
Blower switch: 0 → 1
Waiting time: 30 seconds
Below 1 V → 11 to 14 V
D17-14 (HEAT)* - Body ground
P - Body ground
MAX HOT switch detection signal
Ignition switch: ON
No. 3 heater control knob: Max Hot
11 to 14 V
D17-23 (HLS)* - Body ground
B - Body ground
Headlight signal
Engine idling
Head light switch: on
11 to 14 V → Below 1 V
D17-24 (ALT)* - D16-24 (GND)
LG - W-B
Generator signal
Engine idling
Pulse generation
  1. *: w/ PTC Heater
  2. If the result is not as specified, the ECU may have a malfunction.


    A086154E42

  1. Waveform 1 : Using an oscilloscope
    CAN Communication Signal 
    Terminal Name
    		Between D16-8 (TX+) - D16-24 (GND)
    Tester Range
    		1 V/DIV., 10 μs./DIV.
    Condition
    		Ignition switch ON

    HINT:
    The waveform varies depending on the CAN communication signal.



    2. A086155E39

  2. Waveform 2 : Using an oscilloscope
    CAN Communication Signal 
    Terminal Name
    		Between D16-9 (TX-) - D16-24 (GND)
    Tester Range
    		1 V/DIV., 10 μs./DIV.
    Condition
    		Ignition switch ON

    HINT:
    The waveform varies depending on the CAN communication signal.



    3. E074977E16

  3. Waveform 3 : Using an oscilloscope
    Air Conditioning Compressor Operation Signal 
    Terminal Name
    		Between D16-13 (SOL+) - D16-24 (GND)
    Tester Range
    		5 V/DIV., 500 μs./DIV.
    Condition
    		Engine idling, Blower switch 1, A/C switch on


CHECK COMBINATION METER ASSEMBLY

B210249E01

HINT:
Check from the rear of the connector while it is connected to the combination meter assembly.


Standard 
Terminal No. (Symbol)
Wiring Color
Terminal Description
Condition
Specified Condition
D1-4 (TX1-) - Body ground
V - Body ground
Ambient temperature sensor signal
Ignition switch: ON
Ambient temperature: 25°C (77°F)
1.5 V
D1-23 (TX1+) - Body ground
L - Body ground
Ambient temperature sensor ground
Always
Below 1.0 Ω
If the result is not as specified, the combination meter may have a malfunction.