Infiniti F50. Manual - part 646

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -

LT-51

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Terminals and Reference Value for Daytime Light Control Unit 

EKS001BH

Terminal 

No.

Wire 

color

Item

Condition

Reference value

(Approximate values)

1

W/R

Alternator

When turning ignition switch to “ON”

Less than 1V

When engine is running

Battery voltage

When turning ignition switch to “OFF”

Less than 1V

2

SB

Start signal

When turning ignition switch to “START”

Battery voltage

When turning ignition switch to “ON” from “START”

Less than 1V

When turning ignition switch to “ACC” or “OFF”

Less than 1V

3

W/G

Power source

When turning ignition switch to “ON”

Battery voltage

When turning ignition switch to “START”

Battery voltage

When turning ignition switch to “ACC” or “OFF”

Less than 1V

4

R

RH light fuse

When lighting switch is turned to the 2ND position with “HI 
BEAM” or “FLASH TO PASS” position   

Battery voltage

When lighting switch is turned to “FLASH TO PASS” posi-
tion with ignition switch “ON” position

Battery voltage

5

W/G

LH light fuse

When lighting switch is turned to the 2ND position with “HI 
BEAM” or “FLASH TO PASS” position

Battery voltage

When lighting switch is turned to “FLASH TO PASS” posi-
tion with ignition switch “ON” position

Battery voltage

6

R/W

LH hi beam

When lighting switch is turned to the 2ND position with “HI 
BEAM” or “FLASH TO PASS” position

Battery voltage

When releasing parking brake with engine running and turn-
ing lighting switch to “OFF” (daytime light operation)

CAUTION:

Block wheels and ensure selector lever is in N or P 
position.

Half battery voltage

7

R/W

RH hi beam

When lighting switch is turned to the 2ND position with “HI 
BEAM” or “FLASH TO PASS” position

Battery voltage

When releasing parking brake with engine running and turn-
ing lighting switch to “OFF” (daytime light operation)

CAUTION:

Block wheels and ensure selector lever is in N or P 
position.

Battery voltage

9

P

RH hi beam
(ground)

When turning lighting switch to the 2ND position with “HI 
BEAM“ or “FLASH TO PASS” position

Less than 1V

When releasing parking brake with engine running and turn-
ing lighting switch to “OFF” (daytime light operation)

CAUTION:

Block wheels and ensure selector lever is in N or P 
position.

Half battery voltage

10

L/Y

LH hi beam
(ground)

When turning lighting switch to the 2ND position with “HI 
BEAM” or “FLASH TO PASS” position

Less than 1V

When releasing parking brake with engine running and turn-
ing lighting switch to “OFF” (daytime light operation)

CAUTION:

Block wheels and ensure selector lever is in N or P 
position.

Less than 1V

13

L/R

LH lighting switch (Hi 
beam)

When turning lighting switch to the 2ND position with “HI 
BEAM” or “FLASH TO PASS” position

Less than 1V

14

P

RH lighting switch (Hi 
beam)

When turning lighting switch to the 2ND position with “HI 
BEAM” or “FLASH TO PASS” position

Less than 1V

16

B

Ground

—

0V

LT-52

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -

Symptom Chart

EKS000SO

17

Y

Parking brake switch

When parking brake is released

Battery voltage

When parking brake is pulled

Less than 1.7V

Terminal 

No.

Wire 

color

Item

Condition

Reference value

(Approximate values)

Symptom

Repair Procedure

Neither headlamp operates.

1. Check 10A fuse [No. 6, located in fuse block (J/B) No. 1].

Verify battery positive voltage is present at terminal 7 of head-
lamp battery saver control unit.

2. Check lighting switch. Refer to 

LT-67, "Switch Circuit Inspec-

tion"

 .

3. Check headlamp battery saver control unit. Refer to 

LT-17, 

"Terminals and Reference Value for Battery Saver Control Unit"

 

.

Headlamp (low beam) does not operate, but headlamp (high 
beam) does operate.

1. Check 20A fuse [No. 57, located in fuse, fusible link and relay 

block (J/B)]. Verify battery positive voltage is present at termi-
nals 3 of headlamp relay-1.

2. Check headlamp relay-1.

3. Check harness between headlamp relay-1 and headlamp bat-

tery saver control unit.

4. Check headlamp battery saver control unit. Refer to 

LT-17, 

"Terminals and Reference Value for Battery Saver Control Unit"

 

.

Headlamp (high beam) does not operate, but headlamp (low 
beam) does operate.

1. Check 15A fuse (No. 73, located in fuse, fusible link and relay 

box). Verify battery positive voltage is present at terminals 2 
and 5 of headlamp relay-2.

2. Check headlamp relay-2.

3. Check harness between headlamp relay-2 and headlamp bat-

tery saver control unit.

4. Check headlamp battery saver control unit. Refer to

LT-17, "Ter-

minals and Reference Value for Battery Saver Control Unit"

 .

RH low beam does not operate, but LH low beam does operate.

1. Check 20A fuse [No. 55, located in fuse, fusible link and relay 

block (J/B)]. Verify battery positive voltage is present at terminal 
7 of headlamp relay-1.

2. Check headlamp relay-1.

3. Check harness between headlamp relay-1 terminal 6 and RH 

headlamp for open circuit.

4. Check RH low beam ground circuit.

5. Replace the xenon bulb with other side bulb or new one. (If 

headlamps illuminate correctly, replace the bulb.)

6. Replace the HID control unit with other side control unit or new 

one. (If headlamps illuminate correctly, replace the HID control 
unit.)

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -

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LH low beam does not operate, but RH low beam does operate.

1. Check 20A fuse [No. 57, located in fuse, fusible link and relay 

block (J/B)]. Verify battery positive voltage is present at terminal 
3 of headlamp relay-1.

2. Check headlamp relay-1.

3. Check harness between headlamp relay-1 terminal 5 and LH 

headlamp for open circuit.

4. Check LH low beam ground circuit.

5. Replace the xenon bulb with other side bulb or new one. (If 

headlamps illuminate correctly, replace the bulb.)

6. Replace the HID control unit with other side control unit or new 

one. (If headlamps illuminate correctly, replace the HID control 
unit.)

RH high beam does not operate, but LH high beam does operate.

1. Check bulb.

2. Check the following.

–

Check harness between headlamp relay-2 terminal 3 and day-
time light control unit terminal 4.

–

Check harness between daytime light control unit and head-
lamp RH.

3. Check lighting switch. Refer to 

LT-67, "Switch Circuit Inspec-

tion"

 .

4. Check harness between daytime light control unit and lighting 

switch.

5. Check daytime light control unit. Refer to 

LT-51, "Terminals and 

Reference Value for Daytime Light Control Unit"

 .

LH high beam does not operate, but RH high beam does operate.

1. Check bulb.

2. Check the following.

–

Check harness between headlamp relay-2 terminal 3 and day-
time light control unit terminal 5.

–

Check harness between daytime light control unit and head-
lamp LH.

3. Check lighting switch. Refer to 

LT-67, "Switch Circuit Inspec-

tion"

 .

4. Check harness between daytime light control unit and lighting 

switch.

5. Check daytime light control unit. Refer to 

LT-51, "Terminals and 

Reference Value for Daytime Light Control Unit"

 .

High beam indicator does not work.

1. Check bulb in combination meter.

2. Check harness between headlamp relay-2 terminal 3 and com-

bination meter for open circuit.

Symptom

Repair Procedure

LT-54

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -

Aiming Adjustment

EKS000SQ

Refer to 

LT-31, "Aiming Adjustment"

  in “HEADLAMP (FOR USA)”.

Bulb Replacement

EKS000SP

Refer to 

LT-32, "Bulb Replacement"

  in “HEADLAMP (FOR USA)”.

Removal and Installation

EKS000T5

Refer to 

LT-34, "Removal and Installation"

  in “HEADLAMP (FOR USA)”.

Disassembly and Assembly

EKS000UN

Refer to 

LT-35, "Disassembly and Assembly"

  in “HEADLAMP (FOR USA)”.

Battery saver control does not operate properly.

1. Verify 12 positive voltage from BCM is present at terminal 10 of 

headlamp battery saver control unit:

–

Within 45 seconds after ignition switch turned off.

–

Front door is opened or more than 45 seconds after ignition 
switch is turned off.

2. Check the following.

–

Harness between BCM and LH or RH front door switch for open 
or short circuit. 

–

LH or RH front door switch ground circuit.

–

LH or RH front door switch.

3. Check the following.

–

Harness between headlamp battery saver control unit terminals 
5 or 13 and lighting switch terminal 11 for open or short circuit. 

–

Harness between lighting switch terminal 5 and ground.

–

Lighting switch. Refer to 

LT-67, "Switch Circuit Inspection"

 .

4. Check headlamp battery saver control unit.

5. Check BCM. Refer to 

LT-18, "Terminals and Reference Value 

for BCM"

 .

Daytime light control does not operate properly.

1. Check 10A fuse [No. 82, located in fuse, fusible link and relay 

box]. Verify battery positive voltage is present at terminal 3 of 
daytime light control unit.

2. Check parking brake switch.

3. Check harness between parking brake switch and daytime light 

control unit.

4. Check harness between alternator and daytime light control 

unit.

5. Check daytime light control unit. Refer to 

LT-51, "Terminals and 

Reference Value for Daytime Light Control Unit"

 . 

Symptom

Repair Procedure