Infiniti Q45. Manual - part 704

STEP LAMP

LT-153

C

D

E

F

G

H

I

J

L

M

A

B

LT

TKWM3719E

LT-154

STEP LAMP

Terminals and Reference Values for BCM

NKS001AA

Terminals and Reference Values for Driver Door Control Unit (LCU01)

NKS001AB

Terminal 

No.

Wire 

color

Item

Measuring condition

Reference value

Ignition 

switch

Operation or condition

17

BR/Y

Data link RX

—

—

—

18

G/B

Data link TX

—

—

—

33

W

Door rock assembly rear LH 
(door switch) signal

OFF

Rear LH door switch

ON (open)

Approx. 0 V

OFF (closed)

Battery voltage

37

W/G

Front door switch (passen-
ger side) signal

OFF

Passenger door switch

ON (open)

Approx. 0 V

OFF (closed)

Battery voltage

56

B

Ground

—

—

—

67

G/W

Data line A-3

—

—

—

68

W/B

IGN power supply

ON

—

Battery voltage

105

Y/L

Battery power supply

OFF

—

Battery voltage

113

B

Ground

—

—

—

142

W/R

Front door switch (driver 
side) signal

OFF

Driver door switch

ON (open)

Approx. 0 V

OFF (closed)

Battery voltage

143

W/L

Door lock assembly rear RH 
(door switch) signal

OFF

Rear RH door switch

ON (open)

Approx. 0 V

OFF (closed)

Battery voltage

Terminal 

No.

Wire 

color

Item

Measuring condition

Reference value

Ignition 

switch

Operation or condition

3

R

Step lamp 

OFF

Each door switch

ON (open)

Approx. 0 V

OFF (closed)

Battery voltage

5

G/OR

Local data line

—

—

8

G/W

Data line A-3

—

—

—

14

Y/G

Power source (circuit 
breaker)

OFF

—

Battery voltage

15

B

Ground

ON

—

Approx. 0 V

SIIA0591J

STEP LAMP

LT-155

C

D

E

F

G

H

I

J

L

M

A

B

LT

Terminals and Reference Values for Passenger Door Control Unit

NKS001AC

Terminals and Reference Values for Rear LH, RH Door Control Unit

NKS001AD

Work Flow

NKS001AE

1.

Confirm the symptom or customer complaint.

2.

Understand system description. Refer to 

LT-146, "System Description"

 .

3.

Perform preliminary check. Refer to 

LT-156, "Preliminary Check"

 .

4.

Does the door lock system operate normally? If YES, GO TO 5. If NO, GO TO Power door lock system

BL-44, "Symptom Chart"

  in “BODY LOCK & SECURITY SYSTEM (BL)” section.

5.

Find the cause of trouble following the trouble diagnosis chart by symptom and repair or replace as neces-
sary. Refer to 

LT-161, "Symptom Chart"

 .

6.

Does the total coordinated interior illumination operate normally? If YES, GO TO 7. If NO, GO TO 5.

7.

INSPECTION END

Terminal 

No.

Wire 

color

Item

Measuring condition

Reference value

Ignition 

switch

Operation or condition

6

W/R

Battery power supply

OFF

—

Battery voltage

7

B

Ground

ON

—

Approx. 0 V

8

R

Step lamp 

OFF

Each door switch

ON (open)

Approx. 0 V

OFF (closed)

Battery voltage

11

G/OR

Local data line

—

—

SIIA0591J

Termi-

nal No.

Wire 

color

Item

Measuring condition

Reference value

Ignition 

switch

Operation or condition

6

Y/B

Battery power supply

OFF

—

Battery voltage

7

B

Ground

ON

—

Approx. 0 V

8

R/W

Step lamp 

OFF

Each door switch

ON (open)

Approx. 0 V

OFF (closed)

Battery voltage

11

G/OR

Local data line

—

—

SIIA0591J

LT-156

STEP LAMP

Preliminary Check

NKS001AF

CHECK POWER SUPPLY AND GROUND CIRCUIT

1. 

CHECK FUSE

Check for blown fuses.

Refer to 

LT-148, "Wiring Diagram — STEP/L —"

 .

OK or NG

OK

>> GO TO 2.

NG

>> If fuse or fusible link is blown, be sure eliminate cause of malfunction before installing new fuse or

fusible link. Refer to 

PG-2, "POWER SUPPLY ROUTING"

 .

2. 

CHECK POWER SUPPLY CIRCUIT

1.

Disconnect BCM connector and driver/passenger/rear LH/rear
RH door control unit connectors.

2.

Check voltage between BCM and driver/passenger/rear LH/rear
RH door control unit harness connector, and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair harness or connector.

Unit

Power source

Fuse and fusible link No.

BCM

Battery

3

Ignition switch ON or START

1

Driver/passenger/rear LH/rear RH door 
control unit

Battery voltage

H

Terminal

Ignition switch position

(+)

(

−

)

OFF

ON

Connector

Terminal

BCM (M4)

105 

Ground

Battery
voltage

Battery
voltage

68 

Approx. 0 V

Driver door control unit (D8)

14 

Battery
voltage

Passenger door control unit 
(D39)

6

Rear LH door control unit 
(D59)

6

Rear RH door control unit 
(D79)

6

PKIA5161E