Infiniti Q45. Manual - part 686

FRONT FOG LAMP

LT-81

C

D

E

F

G

H

I

J

L

M

A

B

LT

TKWM3721E

LT-82

FRONT FOG LAMP

TKWM3722E

FRONT FOG LAMP

LT-83

C

D

E

F

G

H

I

J

L

M

A

B

LT

Terminals and Reference Values for Headlamp Battery Saver Control Unit

NKS0018R

Terminals and Reference Values for BCM

NKS0018S

Terminal 

No.

Wire 

color

Item

Operation or condition

Reference value

1

W/B

Ignition switch

Ignition switch

OFF or ACC

Approx. 0 V

ON or START

Battery voltage

2

R/Y

Headlamp relay OUT 1

Ignition switch
(with lighting switch 
except OFF or 1ST)

OFF 

or 

ACC

More than 45 seconds after igni-
tion switch is turned OFF or ACC

Battery voltage

Within 45 seconds after ignition 
switch is turned OFF or ACC

Approx. 0 V

ON or START

Approx. 0 V

Headlamps illuminate by auto light control.

Approx. 0 V

3

R/B

Headlamp switch 1

Lighting switch

1ST

Approx. 2.4 V

PASS or 2ND

Approx. 0 V

Headlamps illuminate by auto light control.

Approx. 0 V

4

B

Ground

—

Approx. 0 V

7

Y/G

Battery power supply

—

Battery voltage

8

R/Y

Headlamp relay OUT 2

Ignition switch
(with lighting switch 
except OFF or 1ST)

OFF 

or 

ACC

More than 45 seconds after igni-
tion switch is turned OFF or ACC

Battery voltage

With 45 seconds after ignition 
switch is turned OFF or ACC

Approx. 0 V

ON or START

Approx. 0 V

Headlamps illuminate by auto light control.

Approx. 0 V

9

R/B

Headlamp switch 2

Lighting switch

1ST

Approx. 2.4 V

PASS or 2ND

Approx. 0 V

Headlamps illuminate by auto light control.

Approx. 0 V

10

W

RAP input signal 

Ignition switch

OFF or ACC (After more than 45 seconds 
with ignition switch turned OFF or ACC)

Battery voltage

ON or START

Approx. 0 V

11

B

Ground

—

Approx. 0 V

Terminal 

No.

Wire 

color

Item

Measuring condition

Reference value

Ignition 

switch

Operation or condition

5

R/Y

Headlamp relay signal

ON

Lighting switch: 
AUTO

Light is applied to optical sensor.

Battery voltage

Light is not applied to optical sensor.

Approx. 0 V

14

R/W

Lighting switch AUTO 
signal

ON

Lighting switch

AUTO

Approx. 0 V

OFF

Approx. 8 V

37

W/G

Front door switch
(Passenger side) signal

OFF

Front door switch 
(Passenger side)

ON (open)

Approx. 0 V

OFF (close)

Battery voltage

135

W

RAP output signal

OFF

When headlamp battery saver timer is operated

Approx. 0 V

142

W/R

Front door switch
(Driver side) signal

OFF

Front door switch 
(Driver side) signal

ON (open)

Approx. 0 V

OFF (close)

Battery voltage

LT-84

FRONT FOG LAMP

Work Flow

NKS0018T

1.

Confirm the symptom or customer complaint.

2.

Understand system description. Refer to 

LT-77, "System Description"

 .

3.

Perform the preliminary check. Refer to 

LT-84, "Preliminary Check"

 .

4.

Check symptom and repair or replace the cause of malfunction.

5.

Does front fog lamp operate normally? If YES, GO TO 6. If NO, GO TO 4.

6.

INSPECTION END

Preliminary Check

NKS0018U

CHECK POWER SUPPLY AND GROUND CIRCUIT

1. 

CHECK FUSE

Check for blown fuses.

Refer to 

LT-80, "Wiring Diagram — F/FOG —"

 .

OK or NG

OK

>> GO TO 2.

NG

>> If the fuse is blown be sure to eliminate cause of malfunction before installing new fuse. Refer to

PG-2, "POWER SUPPLY ROUTING"

 .

2. 

 CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect battery saver control unit connector.

3.

Check voltage between battery saver control unit harness con-
nector and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair harness or connector.

3. 

CHECK GROUND CIRCUIT

Check continuity between battery saver control unit harness connec-
tor and ground.

OK or NG

OK

>> INSPECTION END

NG

>> Repair harness or connector.

Unit

Power source

Fuse No.

Headlamp battery saver control unit

Ignition switch ACC or ON

1

Battery

6

Front fog lamp relay

Battery 

78

Terminal

Ignition switch position

(+)

(

−

)

OFF

ACC

ON

Connector

Terminal

M33

1 

Ground

Approx. 0V

Approx. 0V

Battery 
voltage

M34

7 

Battery 
voltage

Battery 
voltage

Battery 
voltage

PKIB1724E

Terminal

Continuity

Connector

Terminal 

Ground

M33

4 

Yes

M34

11

PKIB1725E