Infiniti M45 (Y34). Manual - part 664

STEP LAMP

LT-163

C

D

E

F

G

H

I

J

L

M

A

B

LT

Terminals and Reference Value for Driver Door Control Unit (LCU 01)

AKS004DH

Terminals and Reference Value for Passenger and Rear LH, RH Door Control 
Unit

AKS002H2

*: Rear LH door control unit and rear RH control unit

Terminals and Reference Value for BCM

AKS004DI

Terminal 

No.

Wire 

color

Item

Operation or condition

Reference value

3

R

Step lamp 

Each door switch

ON (open)

Approx. 0V

OFF (closed)

Battery voltage

5

L/Y

Local data line

—

8

G/W

Data line A-3

—

—

14

Y/G

Power source (PTC)

—

Battery voltage

15

B

Ground

—

Approx. 0V

SIIA0591J

Terminal 

No.

Wire color

Item

Operation or condition

Reference value

10

W/R (Y/B)*

Power source (PTC)

—

Battery voltage

11

B

Ground

—

Approx. 0V

15

L/Y

Local data line

—

16

R (R/W)*

Step lamp 

Each door switch

ON (open)

Approx. 0V

OFF (closed)

Battery voltage

SIIA0591J

Terminal 

No.

Wire 

color

Signal description

Measuring condition

Reference value

Ignition 

switch

Operation or condition

17

BR/Y

Data link RX

—

—

—

18

P

Data link TX

—

—

—

33

W

Door lock assembly rear LH 
(door switch) signal

OFF

Door lock assembly rear 
LH (door switch)

ON (open)

Approx. 0V

OFF (closed)

Battery voltage

37

LG

Front door switch (passen-
ger side) signal

OFF

Front door switch (pas-
senger side)

ON (open)

Approx. 0V

OFF (closed)

Battery voltage

56

B

Ground

—

—

Approx. 0V

67

G/W

Data line A-3

—

—

—

68

W/B

Ignition switch ON or START

ON

—

Battery voltage

105

Y/L

Battery power supply

OFF

—

Battery voltage

113

B

Ground

—

—

Approx. 0V

LT-164

STEP LAMP

Work Flow

AKS002H3

1.

Confirm the symptom or customer complaint.

2.

Understand system description. Refer to 

LT-154, "System Description"

 .

3.

Perform preliminary check. Refer to 

LT-164, "Preliminary Check"

 .

4.

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

BL-30, "Work Flow"

  in BL

section.

5.

Find the cause of malfunction following the trouble diagnosis chart by symptom and repair or replace as
necessary. Refer to 

LT-169, "Step Lamp Does Not Illuminate/Does Not Go Off When Door Is Opened/

Closed"

 .

6.

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

7.

Inspection end.

Preliminary Check

AKS002H4

INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT

1. 

CHECK FUSE

Check if any of the following fuses in BCM are blown.

Refer to 

LT-157, "Wiring Diagram — STEP/L —"

 .

OK or NG

OK

>> GO TO 2.

NG

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

PG-

2, "POWER SUPPLY ROUTING"

 .

142

R/Y

Front door switch (driver 
side) signal

OFF

Front door switch (driver 
side)

ON (open)

Approx. 0V

OFF (closed)

Battery voltage

143

W/L

Door lock assembly rear RH 
(door switch) signal

OFF

Door lock assembly rear 
RH (door switch)

ON (open)

Approx. 0V

OFF (closed)

Battery voltage

Terminal 

No.

Wire 

color

Signal description

Measuring condition

Reference value

Ignition 

switch

Operation or condition

Unit

Power source

Fuse No.

BCM

Battery

3

Ignition switch ON or START position

1

STEP LAMP

LT-165

C

D

E

F

G

H

I

J

L

M

A

B

LT

2. 

CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the connectors for the BCM and driver door control unit, passenger door control unit or rear
LH, RH door control units.

3.

Check voltage between BCM harness connector M4 terminals
68 (W/B), 105 (Y/L) and ground.

4.

Check voltage between the following harness connector termi-
nal of the driver door control unit, passenger door control unit or
rear LH/RH door control units and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Check harness for open or short power supply circuit.

Terminals

Ignition switch position

(+)

(-)

OFF

ACC

ON

Connector

Terminals 

(Wire color)

M4

105 (Y/L)

Ground

Battery 
voltage

Battery 
voltage

Battery 
voltage

68 (W/B)

0V

0V

Battery 
voltage

Terminals

Ignition 

switch 

position

Voltage

(+)

(-)

Connector

Terminals 

(Wire color)

Driver door control unit (D8)

14 (Y/G)

Ground

OFF

Battery 
voltage

Passenger door control unit (D38)

10 (W/R)

Rear LH door control unit (D58)

10 (Y/B)

Rear RH door control unit (D78)

10 (Y/B)

PKIA5969E

PKIA5970E

LT-166

STEP LAMP

3. 

CHECK GROUND CIRCUIT

1.

Check continuity between BCM harness connector M4 terminals
56 (B), 113 (B) and ground.

2.

Check continuity between the following harness connector ter-
minal of the driver door control unit, passenger door control unit,
or rear LH/RH door control units and ground.

OK or NG

OK

>> INSPECTION END

NG

>> Repair harness.

CONSULT-II Function

AKS002H5

●

CONSULT-II has the display function for the work support, data monitor and active test for each part by
combining data receiving and sending via the communication line from the BCM.

CONSULT-II BASIC OPERATION PROCEDURE

1.

With ignition switch OFF, connect “CONSULT-II” and “CON-
SULT-II CONVERTER” to data link connector, then turn ignition
switch ON.

Terminals

Continuity

Connector

Terminal (Wire color)

M4

56 (B)

Ground

Yes

113 (B)

PKIA5971E

Terminals

Continuity

Connector

Terminal 

(Wire color)

Driver door control unit (D8)

15 (B)

Ground

Yes

Passenger door control unit (D38)

11 (B)

Rear LH door control unit (D58)

Rear RH door control unit (D78)

PKIA5972E

IVMS diagnosis position

Diagnosis mode

Description

Step lamp

Data monitor

Displays input data of the BCM and each LCU in real-time.

Active test

Operation of electrical loads can be checked by sending driving signal to them.

BCM part number

Displays BCM part No.

PKIA5840E