Infiniti Q45 (FY33). Manual — part 335
SEL868W
SEL869W
DIAGNOSTIC PROCEDURE 8
(Encoder and limit switch check)
CHECK DOOR WINDOW SLIDE
MECHANISM
Check the following.
- Obstacles in window, glass molding, etc.
- Worn or deformed glass molding
- Door sash tilted too far inward or out-
ward
- Door window regulator
OK
E
NG
Remove obstacles or
repair door window slide
mechanism.
CHECK POWER SUPPLY TO LIMIT
SWITCH
1. Disconnect driver side/front passenger
side power window regulator connec-
tors.
2. Turn ignition switch ON.
3. Check voltage between LCU01/LCU02
connectors terminal
q
4
and ground.
Approx. 5V should exist.
OK
E
NG
Replace LCU for malfunc-
tioning portion.
CHECK LIMIT SWITCH OPERATION
1. Turn ignition switch OFF.
2. Connect driver side/front passenger
side power window regulator connec-
tors.
3. Turn ignition switch ON.
4. Check voltage between LCU01/LCU02
connectors terminal
q
4
and ground dur-
ing power window closing operation.
NG
E
OK
CHECK ENCODER
Measure voltage between
LCU01/LCU02 connectors
terminal
q
10
and ground
with oscilloscope when
power window is in auto-
matic closing operation.
If check result is NG,
replace power window
regulator for malfunctioning
portion.
If check result is OK,
replace LCU for malfunc-
tioning portion.
RESET LIMIT SWITCH
Reset limit switch. Refer to BT section.
Then check voltage between LCU01/
LCU02 connectors terminal
q
4
and ground
during power window closing operation at
least ten times.
OK
E
NG
Replace power window
regulator for malfunctioning
portion.
CHECK ENCODER
Measure voltage between LCU01/LCU02
connectors terminal
q
10
and ground with
oscilloscope when power window is in
automatic closing operation.
OK
E
NG
Replace power window
regulator for malfunctioning
portion.
Replace LCU for malfunctioning portion.
Terminal No.
Condition
Voltage (DCV)
q
4
Approx. 15 mm
(0.59 in) below
the full closed
position to full
closed position
Approx. 5
Other positions
Approx. 0
Terminal No.
Condition
Voltage (DCV)
q
4
Approx. 15 mm
(0.59 in) below
the full closed
position to full
closed position
Approx. 5
Other positions
Approx. 0
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
POWER WINDOW — IVMS
Trouble Diagnoses (Cont’d)
H
H
H
H
H
EL-331
Component Parts and Harness Connector
Location
SEL870W
POWER DOOR LOCK — IVMS
EL-332
System Description
POWER SUPPLY AND GROUND
Power is supplied at all times
I
through 10A fuse [No.
28
, located in the fuse block (J/B)]
I
to key switch terminal
q
3
.
Power is supplied to BCM terminal
q
69
through key switch terminal
q
4
when key switch is in ON position (key
is inserted in the ignition key cylinder).
BCM is connected to LCU01, LCU02, LCU03 and LCU04 as DATA LINE A-1 or A-2.
When door switch is in OPEN position, ground is supplied
I
to BCM terminal
q
32
or
q
37
I
through front LH or RH door switch terminal
q
1
.
When door is unlocked, ground is supplied
I
to each door LCU terminal
q
5
I
from terminal
q
2
of each door unlock sensor.
When the door is locked with the key, ground is supplied
I
to LCU01 or LCU02 terminal
q
1
I
from terminal
q
3
of the key cylinder switch LH or
I
from terminal
q
1
of the key cylinder switch RH
I
through body grounds
M14
and
M47
.
When the door is unlocked with the key, ground is supplied
I
to BCM terminal
q
31
or
q
27
I
from terminal
q
1
of the key cylinder switch LH or
I
from terminal
q
3
of the key cylinder switch RH
I
through body grounds
M14
and
M47
.
When lock/unlock signal is sent to BCM or LCU, BCM sends a lock/unlock signal to LCUs via DATA LINE A-1
or A-2. LCUs then supply power and ground to each door lock actuator.
OPERATION
I
The lock & unlock switch (SW) on driver’s door trim can lock and unlock all doors.
I
With the lock knob on front LH or RH door set to “LOCK”, all doors are locked. (Signals from front door
unlock sensor)
I
With the door key inserted in the key cylinder on front LH or RH door, turning it to “LOCK”, will lock all
doors; turning it to “UNLOCK” once unlocks the corresponding door; turning it to “UNLOCK” again within
5 seconds after the first unlock operation unlocks all of the other doors. (Signals from front door key cyl-
inder switch)
However, if the ignition key is in the ignition key cylinder and one or more of the front doors are open, setting
the lock & unlock switch, lock knob, or the door key to “LOCK” locks the doors once but then immediately
unlocks them. (Combination signals from key switch, front LH or RH door switch and front LH or RH door
unlock sensor) — (KEY REMINDER DOOR SYSTEM)
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
POWER DOOR LOCK — IVMS
EL-333
Schematic
TEL148M
POWER DOOR LOCK — IVMS
EL-334
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