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

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CHECK AIR CONDITIONING AMPLIFIER

E115964E11

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
D15-1 (IG+) - D15-14 (GND)
Y - W-B
Ignition power supply
Ignition switch ON
11 to 14 V
Ignition switch off
Below 1 V
D15-2 (SOL+) - D15-14 (GND)
R - W-B
A/C compressor operation signal
Engine idling
Blower switch: Lo
A/C switch: on
Pulse generation
(see waveform 1)
D15-3 (PTC1)* - Body ground
G - Body ground
PTC 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
D15-4 (PTC3)* - Body ground
L - Body ground
PTC 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
D15-9 (PRE) - D15-13 (SG-2)
P - GR
Air conditioner pressure sensor signal
Refrigerant pressure: normal
0.70 to 4.69 V
D15-9 (PRE) - D15-13 (SG-2)
P - GR
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
D15-10 (S5-3) - D15-14 (GND)
L - W-B
Power supply for pressure sensor and flow sensor
Ignition switch ON
4.75 to 5.25 V
D15-11 (TX+) - D15-14 (GND)
LG - W-B
Hi-level CAN bus line
Ignition switch ON
Pulse generation
(see waveform 3)
D15-12 (TX-) - D15-14 (GND)
W - W-B
Lo-level CAN bus line
Ignition switch ON
Pulse generation
(see waveform 4)
D15-13 (SG-2) - Body ground
GR - Body ground
Ground for pressure sensor and flow sensor
Always
Below 1.0 Ω
D15-14 (GND) - Body ground
W-B - Body ground
Ground for main power supply
Always
Below 1.0 Ω
D15-21 (B) - D15-14 (GND)
V - W-B
Power source (Back-up)
Always
11 to 14 V
D15-22 (PTC2)* - Body ground
W - Body ground
PTC 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
D15-23 (BLW) - D15-14 (GND)
GR - W-B
Blower motor control signal
Ignition switch ON
Blower switch: Lo
Pulse generation
(see waveform 2)
D15-25 (ALT)* - Body ground
LG - Body ground
Generator signal
Engine idling
Pulse generation
D15-27 (HLS)* - Body ground
B - Body ground
Head light signal
Engine idling
Head light switch: on
Below 1.0 Ω
D15-29 (TR) - D15-34 (SG-1)
SB - V
Room temperature sensor signal
Ignition switch ON
Vehicle interior temperature: 25°C (77°F)
1.8 to 2.2 V
D15-29 (TR) - D15-34 (SG-1)
SB - V
Room temperature sensor signal
Ignition switch ON
Vehicle interior temperature: 40°C (104°F)
1.2 to 1.6 V
D15-33 (TS) - Body ground
BR - Body ground
Solar sensor signal
Ignition switch ON
Solar sensor subject to electric light
0.8 to 4.3 V
D15-33 (TS) - Body ground
BR - Body ground
Solar sensor signal
Ignition switch ON
Solar sensor covered with a cloth
Below 0.8 V
D15-34 (SG-1) - Body ground
V - Body ground
Ground for room temperature sensor
Always
Below 1.0 Ω
D15-37 (LIN1) - D15-14 (GND)
L - W-B
LIN communication signal
Ignition switch ON
Pulse generation
z1-2 (BUS G) - Body ground
-
Ground for BUS IC
Always
Below 1.0 Ω
z1-3 (BUS) - z1-2 (BUS G)
-
BUS IC control signal
Ignition switch ON
Pulse generation
z1-4 (B BUS) - z1-2 (BUS G)
-
Power supply for BUS IC
Always
11 to 14 V
z1-5 (SG) - Body ground
-
Ground for front evaporator temperature sensor
Always
Below 1.0 Ω
z1-6 (TE) - z1-5 (SG)
-
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
D15-20 (MGC) - D15-14 (GND)
B - W-B
A/C compressor magnetic clutch operation signal
Ignition switch ON
Blower switch Lo
A/C switch off
11 to 14 V
Ignition switch ON
Blower switch Lo
A/C switch on
Below 1 V
D15-7 (FLOQ) - D15-13 (SG-2)
SB-GR
Flow sensor signal
Blower switch: Lo
Engine idling
A/C switch off
3.76 to 4.7 V
Blower switch: Lo
Engine idling
A/C switch on
0.3 to 3.76 V
  1. *: w/ PTC heater
  2. If the result is not as specified, the ECU may have a malfunction.


    E074977E17

  1. Waveform 1: Using an oscilloscope
    Air Conditioning Compressor Operation Signal 
    Terminal Name
    		Between SOL+ - GND
    Tester Range
    		5 V/DIV, 500 μs./DIV
    Condition
    		Engine idling, Blower switch LO, A/C switch ON



    2. E103396E17

  2. Waveform 2: Using an oscilloscope.
    Blower Motor Control Signal 
    Terminal Name
    		Between BLW - GND
    Tester Range
    		1 V/DIV, 500 μs./DIV
    Condition
    		Ignition switch ON, Blower switch 1

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



    3. A086154E42

  3. Waveform 3 (Reference): Using an oscilloscope
    CAN Communication Signal 
    Terminal Name
    		Between TX+ - GND
    Tester Range
    		1 V/DIV, 10 μs./DIV
    Condition
    		Ignition switch ON

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



    4. A086155E39

  4. Waveform 4 (Reference): Using an oscilloscope
    CAN Communication Signal 
    Terminal Name
    		Between TX- - GND
    Tester Range
    		1 V/DIV, 10 μs./DIV
    Condition
    		Ignition switch ON

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


CHECK INSTRUMENT CLUSTER FINISH PANEL ASSEMBLY

HINT:
Check from the rear of the connector while it is connected to the instrument cluster finish panel assembly.


E154923E01


Standard 
Terminal No. (Symbol)
Wiring Color
Terminal Description
Condition
Specified Condition
D5-5 (IG) - D5-4 (GND)
P - W-B
Power source (IG)
Ignition switch ON
11 to 14 V
D5-4 (GND)) - Body ground
W-B - Body Ground
Ground
Always
Below 1.0 Ω
D5-3 (LIN1) - D5-4 (GND)
L - W-B
LIN communication signal
Ignition switch ON
Pulse generation
  1. If the result is not as specified, the instrument cluster finish panel assembly may have a malfunction.

CHECK COMBINATION METER ASSEMBLY

B210249E02

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


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
  1. If the result is not as specified, the combination meter assembly may have a malfunction.