Page 2017 of 3189
TROUBLE DIAGNOSIS
ATC-37
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AT C
YHA479
Page 2018 of 3189
ATC-38
TROUBLE DIAGNOSIS
YHA480
Page 2019 of 3189
TROUBLE DIAGNOSIS
ATC-39
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AT C
YHA481
Page 2020 of 3189
ATC-40
TROUBLE DIAGNOSIS
Auto Amp. Terminals and Reference Value
EJS001ZG
Measure voltage between each terminal and body ground by follow-
ing AUTO AMP. INSPECTION TABLE.
PIN CONNECTOR TERMINAL LAYOUT
AUTO AMP. INSPECTION TABLE
RJIA0750E
RJIA1680E
TERMI-
NAL NO.WIRE
COLORITEM CONDITIONVoltage
(V)
1 OR/B Intake sensor - - -
2 W/G Ambient sensor - - -
3 OR/L In-vehicle sensor - - -
4 L/B Speed sensor signalIGN
ONSpeedometer: Approx. 40 km/h (25 MPH)
5 R/Y LAN signalIGN
ON-
9L/WMultiplex communication
(Tx) signal
A/C amp. → AVIGN
ON-
ELF1080D
HAK0652D
RJIA0212E
Page 2021 of 3189

TROUBLE DIAGNOSIS
ATC-41
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10 L/RMultiplex communication
(Rx) signal
AV → A/C amp.IGN
ON-
11 B/Y Sensor ground IGN
ON-Approx. 0
12 OR Sunload sensorIGN
ON--
17 PU/WWater temperature sen-
sor signalIGN
ONEngine coolant temperature: Approx.
60°C
18 BR/WCompressor feed back
signal (With gasoline
engine)IGN
ONA/C ON-Approx. 0
When refrigerant pres-
sure sensor connector is
disconnected.Approx. 5
20 LMultiplex communication
(CLK) signalIGN
ON-
21 G/YPower supply for mode
door, air mix door and
intake door motorIGN
ON-Approx. 12
22 L/R Compressor ON signalIGN
ONCompressor: ON Approx. 0
Compressor: OFF Approx. 5
24 B GroundIGN
ON-Approx. 0
26 R/B Power supply for BATTIGN
OFF-Approx. 12
27 Y/G Power supply for IGNIGN
ON-Approx. 12
29 LG/B Fan ON signalIGN
ONBlower fan: ON Approx. 0
Blower fan: OFF Approx. 5
33 L/W Power supply for ACCIGN
ON-Approx. 12
34 L/BBlower fan motor feed
back signalIGN
ONFan speed: Manual 1st Approx. 8
35 L/YFan control amp. control
signalIGN
ONFan speed:Manual 1st - 4th speed Approx. 2.5 - 3.5
Manual 5th speed Approx. 9.0 TERMI-
NAL NO.WIRE
COLORITEM CONDITIONVo lta g e
(V)
RJIA0213E
SKIA0056J
HAK0363D
Page 2022 of 3189
ATC-42
TROUBLE DIAGNOSIS
Self-diagnosis Function
EJS001ZH
DESCRIPTION
The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from usual control to the self-diagnostic system is accomplished by
starting the engine (turning the ignition switch from OFF to ON) and pressing OFF switch for at least 5 sec-
onds. The “OFF” switch must be pressed within 10 seconds after starting the engine (ignition switch is turned
ON). This system will be canceled by either pressing A/C switch or turning the ignition switch OFF. Shifting
from one step to another is accomplished by means of turning temperature dial, as required.
Additionally shifting from STEP 6 to AUXILIARY MECHANISM is accomplished by means of pushing (fan)
UP switch.
RJIA1681E
Page 2023 of 3189

TROUBLE DIAGNOSIS
ATC-43
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FUNCTION CONFIRMATION PROCEDURE
1.SET IN SELF-DIAGNOSTIC MODE
Method 1 (Without navigation system, or with navigation system)
1. Turn ignition switch to ON.
2. Within 10 seconds after starting engine (ignition switch is turned ON.), press and hold OFF switch for at
least 5 seconds.
3. The self-diagnosis (step 1) should start.
Method 2 (Only with navigation system)
1. Turn OFF the audio system.
2. While pressing “Vehicle Information” switch, turn audio switch (volume adjustment dial) by at least 30
notches.
3. Trouble diagnosis initial screen appears. Using joystick, select “Confirmation and Adjustment”. And press
“Confirm”.
4. Confirmation and adjustment initial screen appears. Using joystick, select “Air-conditioner trouble diagno-
sis”, and press “Confirm” to start self-diagnosis (step 1).
CAUTION:
If battery voltage drops below 12V during step diagnosis 3, actuator speed becomes slower and as a
result, the system may generate an error even when operation is normal. To avoid this, start engine
before performing this diagnosis.
>> GO TO 2.
Page 2024 of 3189
ATC-44
TROUBLE DIAGNOSIS
2. STEP 1 - LEDS AND DISPLAY ARE CHECKED
Check LEDs illuminate and display screen.
OK or NG
OK >> GO TO 3.
NG >> Malfunctioning OFF switch or LEDs.
>> Check multi-function switch.
3. CHECK TO ADVANCE SELF-DIAGNOSIS STEP 2
1. Turn the temperature dial clockwise.
2. Advance to self-diagnosis STEP 2?
Ye s o r N o
Yes >> GO TO 4.
No >> Malfunctioning temperature dial.
>> Check multi-function switch.
4. CHECK TO RETURN SELF-DIAGNOSIS STEP 1
1. Turn the temperature dial counterclockwise.
2. Return to self-diagnosis STEP 1?
Ye s o r N o
Yes >> GO TO 5.
No >> Malfunctioning temperature dial.
>> Check multi-function switch.
RJIA1682E