Infiniti Q45. Manual - part 114

TROUBLE DIAGNOSIS

ATC-51

C

D

E

F

G

H

I

K

L

M

A

B

ATC

10

R

Multiplex communication 
signal (Fr RX)

ON

—

11

R/Y

Sensor ground

ON

—

Approx. 0

12

SB

Sunload sensor

—

—

—

15

G

Multiplex communication 
signal (Rr RX)

ON

—

16

W/B

Power supply for rear vent 
door motor

ON

Rear vent switch: Open

Approx. 12

Rear vent switch: Close

Approx. 0

17

L/OR

Water temperature sensor

—

At idle [after warming up, approx. 
80

°

C (176

°

F)]

NOTE:
The waveforms vary depending 
on coolant temperature.

18

OR

Compressor feedback sig-
nal (Low-pressure cut)

ON

AUTO SW: 
ON (Start 
engine)

Blower motor 
operates.

Approx. 0

When refrigerant 
pressure sensor 
connector is dis-
connected

Approx. 5

20

B

Multiplex communication 
signal (Fr CLK)

ON

—

21

GY

Power supply for each door 
motor

ON

—

Battery voltage

22

Y/B

Compressor ON signal

ON

AUTO switch: ON
(Blower motor operates.)

Approx. 0

AUTO switch: OFF
(A/C system: OFF)

Approx. 5

23

Y

ECV (Electronic Control 
Valve) signal

ON

Self-diagnosis: STEP- 4. (Code 
No. 42)

25

B

Ground

ON

—

Approx. 0

Terminal 

No.

Wire 

color

Item

Ignition 

switch

Condition

Voltage

(V)

RJIA0213E

RJIA0214E

PKIA0098J

HAK0363D

RJIA1563E

ATC-52

TROUBLE DIAGNOSIS

26

Y/G

Power supply for BAT

OFF

—

Battery voltage

27

P

Power supply for IGN

ON

—

Battery voltage

29

SB

Blower motor ON signal

ACC or 

ON

AUTO SW: ON (Blower motor 
operates.)

Approx. 0

AUTO switch: OFF (A/C system: 
OFF)

Approx. 5

30

BR/W

Multiplex communication 
signal (Rr CLK)

ON

—

31

GY/L

Multiplex communication 
signal (Rr TX)

ON

—

35

L/OR

Blower motor drive signal

ACC or 

ON

Blower speed: 1st speed

Terminal 

No.

Wire 

color

Item

Ignition 

switch

Condition

Voltage

(V)

HAK0364D

RJIA0215E

SJIA0116J

TROUBLE DIAGNOSIS

ATC-53

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Self-diagnosis Function

NJS0008B

DESCRIPTION

The self-diagnosis 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-diagnosis system is accomplished by
starting the engine (turning the ignition switch ON) and pressing OFF switch for at least 5 seconds. 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 AUTO switch or turning the ignition switch OFF. Shifting from one step to
another is accomplished by means of turning temperature dial, as required.
Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pushing  (fan) UP switch.

SJIA1282E

ATC-54

TROUBLE DIAGNOSIS

FUNCTION CONFIRMATION PROCEDURE

1. 

SET IN SELF-DIAGNOSIS MODE

1.

Turn ignition switch ON.

2.

Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press OFF switch for at least 5 seconds.

CAUTION:

If battery voltage drops below 12 V during diagnosis STEP-3, door motor 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.

2. 

STEP-1: LEDS AND DISPLAY ARE CHECKED

Check LED illumination and display screen.

OK or NG

OK

>> GO TO 3.

NG

>> Malfunctioning OFF switch, LED or auto amp. Refer to 

ATC-104, "Self-Diagnosis"

 .

3. 

CHECK TO ADVANCE SELF-DIAGNOSIS STEP-2

Turn temperature dial (driver side) clockwise.

Advance to self-diagnosis STEP-2?

YES

>> GO TO 4.

NO

>> Replace multifunction switch. (Temperature dial is malfunctioning.)

4. 

CHECK TO RETURN SELF-DIAGNOSIS STEP-1

Turn temperature dial (driver side) counterclockwise.

Return to self-diagnosis STEP-1?

YES

>> GO TO 5.

NO

>> Replace multifunction switch. (Temperature dial is malfunctioning.)

RJIA1565E

RJIA1895E