Infiniti Q45. Manual - part 678

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -

LT-49

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LT

TKWM3693E

LT-50

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -

Terminals and Reference Value for Daytime Light Control Unit 

NKS0017V

Terminal 

No.

Wire 

color

Item

Condition

Reference value

1

W/R

Alternator

When turning ignition switch to “ON”

Approx. 0 V

When engine is running

Battery voltage

When turning ignition switch to “OFF”

Approx. 0 V

2

L

Start signal

When turning ignition switch to “START”

Battery voltage

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

Approx. 0 V

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

Approx. 0 V

3

W

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”

Approx. 0 V

4

W/G

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” position with igni-
tion 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” position with igni-
tion switch “ON” position

Battery voltage

6

OR

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 turning lighting 
switch to “OFF” (daytime light operation)

CAUTION:

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

Half battery voltage

7

OR

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 turning 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

Approx. 0 V

When releasing parking brake with engine running and turning 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

Approx. 0 V

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

CAUTION:

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

Approx. 0 V

13

L/R

LH lighting switch
(Hi beam)

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

Approx. 0 V

14

P

RH lighting switch
(Hi beam)

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

Approx. 0 V

16

B

Ground

—

Approx. 0 V

17

Y/R

Parking brake 
switch

When parking brake is released

Battery voltage

When parking brake is pulled

Approx. 0 V

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -

LT-51

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Terminals and Reference Value for BCM

NKS0017W

Refer to 

LT-16, "Terminals and Reference Values for BCM"

 .

Terminals and Reference Value for Battery saver Control Unit

NKS0017X

Refer to 

LT-15, "Terminals and Reference Values for Headlamp Battery Saver Control Unit"

 .

Symptom Chart

NKS0017Y

Symptom

Repair Procedure

Headlamps (both side) do not operate.

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

Verify battery positive voltage is present at terminal 7 of headlamp battery saver control 
unit.

2. Check lighting switch. Refer to 

LT-100, "Switch Circuit Inspection"

 .

3. Check headlamp battery saver control unit. Refer to 

LT-15, "Terminals and Reference 

Values for Headlamp Battery Saver Control Unit"

 .

Low beam headlamps do not operate, but 
high beam headlamps operate.

1. Check headlamp relay-1.

2. Check harness between headlamp relay-1 and headlamp battery saver control unit.

3. Check headlamp battery saver control unit. Refer to 

LT-15, "Terminals and Reference 

Values for Headlamp Battery Saver Control Unit"

 .

High beam headlamps do not operate, 
but low beam headlamps operate.

1. Check 15A fuse [No. 73, located in fuse, fusible link and relay box]. Verify battery posi-

tive 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 battery saver control unit.

4. Check headlamp battery saver control unit. Refer to 

LT-15, "Terminals and Reference 

Values for Headlamp Battery Saver Control Unit"

 .

RH low beam headlamp does not oper-
ate, but LH low beam headlamp operates.

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 front combination lamp RH 

for open circuit.

4. Check continuity between front combination lamp RH terminal 8 and ground.

5. Replace xenon bulb with other side bulb or new one. (If headlamps illuminate correctly, 

replace bulb.)

6. Replace HID control unit with other side control unit or new one. (If headlamps illumi-

nate correctly, replace HID control unit.)

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

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 front combination lamp LH for 

open circuit.

4. Check continuity between front combination lamp LH terminal 8 and ground.

5. Replace xenon bulb with other side bulb or new one. (If headlamps illuminate correctly, 

replace bulb.)

6. Replace HID control unit with other side control unit or new one. (If headlamps illumi-

nate correctly, replace HID control unit.)

RH high beam headlamp does not oper-
ate, but LH high beam headlamp oper-
ates.

1. Check bulb.

2. Check the following.

–

Check harness between headlamp relay-2 terminal 3 and daytime light control unit ter-
minal 4.

–

Check harness between daytime light control unit and front combination lamp RH.

3. Check lighting switch. Refer to 

LT-100, "Switch Circuit Inspection"

 .

4. Check harness between daytime light control unit and lighting switch.

5. Check daytime light control unit. Refer to 

LT-50, "Terminals and Reference Value for 

Daytime Light Control Unit"

 .

LT-52

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -

LH high beam headlamp does not oper-
ate, but RH high beam headlamp oper-
ates.

1. Check bulb.

2. Check the following.

–

Check harness between headlamp relay-2 terminal 3 and daytime light control unit ter-
minal 5.

–

Check harness between daytime light control unit and front combination lamp LH.

3. Check lighting switch. Refer to 

LT-100, "Switch Circuit Inspection"

 .

4. Check harness between daytime light control unit and lighting switch.

5. Check daytime light control unit. Refer to 

LT-50, "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 combination meter for open 

circuit.

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-100, "Switch Circuit Inspection"

 .

4. Check headlamp battery saver control unit.

5. Check BCM. Refer to 

LT-16, "Terminals and Reference Values for BCM"

 .

Daytime light control does not operate 
properly.

1. Check 10A fuse [No. 82, located in fuse block]. 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-50, "Terminals and Reference Value for 

Daytime Light Control Unit"

 . 

Symptom

Repair Procedure