Infiniti F50. Manual - part 640

HEADLAMP (FOR USA)

LT-27

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LT

Lighting Switch (AUTO) System Check

EKS001HD

1. 

CHECK LIGHTING SWITCH AUTO SIGNAL

With CONSULT-II

●

Operate the lighting switch via “AUTO LIGHT SWITCH” on
DATA MONITOR screen and check that the lamp turns on and
off as commanded.

Without CONSULT-II

●

Operate the lighting switch via “switch monitor” of self-diagnosis function check that the lamp turns on and
off as commanded.

OK or NG

OK

>> Lighting switch (AUTO) is OK.

NG

>> GO TO 2.

2. 

CHECK WIRE HARNESS CONTINUITY

1.

Disconnect BCM connector and lighting switch connector.

2.

Check continuity at the harness between BCM harness connec-
tor M4 terminal 14 (Y) and the lighting switch harness connector
M55 terminal 42 (Y).

3.

Check continuity between BCM harness connector M4 terminal
14(Y) and body ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace harness.

3. 

CHECK LIGHTING SWITCH

Check continuity of the lighting switch. Refer to 

LT-67, "Switch Circuit Inspection"

 .

OK or NG

OK

>> Replace BCM.

NG

>> Replace the lighting switch.

Clearance lamps illuminate when outside of the vehicle becomes 
dark, but headlamp stay off. (Lighting switch 1st position and 2nd 
position operate normally.)

●

Headlamp relay system. Refer to 

LT-29, "Headlamp Relay Sys-

tem Check"

 .

●

Optical sensor system. Refer to 

LT-28, "Optical Sensor System 

Check"

 .

If above systems are normal, replace the BCM.

●

Headlamps illuminate when outside of the vehicle becomes 
dark, but clearance lamps stay off. (Lighting switch 1st position 
and 2nd position operate normally.)

●

Headlamps go out when outside of the vehicle becomes light, 
but clearance lamps stay on.

●

Tail lamp relay system. Refer to 

LT-30, "Tail Lamp Relay Sys-

tem Check"

 .

If above system is normal, replace the BCM.

Symptom

Malfunctioning system and reference

Lighting switch AUTO

: ON

Lighting switch OFF

: OFF

SKIA0451E

14 (Y) - 42 (Y)

: Continuity should exists.

14(Y) - Body ground

: Continuity should not exists.

SKIA0453E

LT-28

HEADLAMP (FOR USA)

Optical Sensor System Check

EKS006ZL

1. 

CHECK OPTICAL SENSOR OUTPUT SIGNAL

With CONSULT-II

●

Using “OPTICAL SEN” on DATA MONITOR screen, check differ-
ence in the voltage when light is applied to optical sensor and
light is not applied to optical sensor.

Without CONSULT-II

●

Turn ignition switch to ACC position.

●

Check voltage between BCM harness connector M4 terminal 52
(G/R) and ground when light is applied to optical sensor and
light is not applied to optical sensor.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2. 

CHECK OPTICAL SENSOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch to OFF position.

2.

Disconnect the BCM connector and the optical sensor connector.

3.

Check continuity between BCM harness connector M4 terminal
59 (SB) and optical sensor harness connector M110 terminal 1
(SB).

4.

Check continuity between BCM harness connector M4 terminal
59 (SB) and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair harness or connector.

Condition

Reference value of data monitor [V]

Light is applied to optical sensor.

More than 3

Light is not applied to optical sensor.

Approx. 0.5

SKIA0454E

Terminals

Condition

Voltage (V)

(+)

(–)

Connector

Terminal 

(Wire color)

M4

52 (G/R)

Ground

Light is applied to 
optical sensor

More than 3

Light is not applied 
to optical sensor

Approx. 0.5

SKIA0455E

Continuity should exist.

Continuity should not exist.

SKIA0456E

HEADLAMP (FOR USA)

LT-29

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LT

3. 

CHECK OPTICAL SENSOR SIGNAL CIRCUIT

1.

Check continuity between BCM harness connector M4 terminal
52 (G/R) and optical sensor harness connector M110 terminal 2
(G/R).

2.

Check continuity between BCM harness connector M4 terminal
52 (G/R) and ground.

OK or NG

OK

>> GO TO 4.

NG

>> Repair harness or connector.

4. 

CHECK OPTICAL SENSOR GROUND CIRCUIT

1.

Check continuity between BCM harness connector M4 terminal
58 (Y/B) and optical sensor harness connector M110 terminal 3
(Y/B).

2.

Check continuity between BCM harness connector M4 terminal
58 (Y/B) and ground.

OK or NG

OK

>> GO TO 5.

NG

>> Repair harness or connector.

5. 

CHECK OPTICAL SENSOR POWER SUPPLY OUTPUT SIGNAL

1.

Connect BCM connector.

2.

Check voltage between BCM harness connector M4 terminal 59 (SB).

OK or NG

OK

>> Replace the optical sensor.

NG

>> Replace the BCM.

Headlamp Relay System Check

EKS001HF

1. 

CHECK HEADLAMP RELAY CONTROL SIGNAL VOLTAGE 

1.

Turn the ignition switch OFF.

2.

Disconnect the BCM connector.

3.

Check voltage between BCM harness connector M4 terminal 5
(R/Y) and body ground while operating the lighting switch in
OFF.

OK or NG

OK

>> Headlamp relay is OK.

NG

>> Check harness for open or short between BCM and

headlamp relay-1 and 2.

Continuity should exist.

Continuity should not exist.

SKIA0457E

Continuity should exist.

Continuity should not exist.

SKIA0458E

Approx. 5V

Lighting switch OFF

5 - Body ground

: Battery voltage should exist.

SKIA0460E

LT-30

HEADLAMP (FOR USA)

Tail Lamp Relay System Check

EKS001HG

1. 

CHECK TAIL LAMP RELAY CONTROL SIGNAL VOLTAGE

1.

Turn the ignition switch OFF.

2.

Disconnect the BCM connector.

3.

Check voltage between BCM harness connector M4 terminal 11
(LG/B) and body ground while operating the lighting switch in
OFF.

OK or NG

OK

>> GO TO 2.

NG

>> Check harness for open or short between BCM and tail

lamp relay.

2. 

CHECK TAIL LAMP SIGNAL VOLTAGE

Check voltage between BCM harness connector M4 terminal 3 (R/L)
and body ground while operating lighting switch in 1ST position.

OK or NG

OK

>> Tail lamp relay is OK.

NG

>> GO TO 3.

3. 

CHECK TAIL LAMP RELAY

1.

Remove the tail lamp relay.

2.

Apply 12V between tail lamp relay terminals 2 and 1, and check
continuity between terminals 3 and 5 and between 6 and 7.

OK or NG

OK

>> Check harness for open or short between BCM and tail

lamp relay.

NG

>> Replace the tail lamp relay.

Lighting switch OFF

11 - Body ground

: Battery voltage should exist.

SKIA0461E

Lighting switch in 
1ST position

3 - Body ground

: Battery voltage should exist.

SKIA0462E

3 - 5

: Continuity should exists.

6 - 7

: Continuity should exists.

SEC202B