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
.
3.
Perform preliminary check. Refer to
4.
Does the door lock system operate normally? If YES, GO TO 5. If NO, refer to
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/
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.
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
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
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