Lexus SC300 / Lexus SC400. Service manual — part 138
Troubleshooting
You will find the cause of trouble more easily by properly using the table shown below. In this table, the
numbers indicate the order of priority of the causes of trouble. Check each part in the order shown. If neces-
sary, replace the part.
See page
BE–4
,21
BE–4
,21
BE–4
,20
BE–4
,20
BE–156
BE–152
BE–149
BE–151
BE–152
BE–26
BE–392
BE–4
,20
–
–
Part
name
Trouble
AM1 Fuse
DOME Fuse
DOOR Fuse
POWER Fuse
Theft Deterrent and Door Lock Control ECU
Power Window Main Relay
Power Window Master Switch
Power Window Switch
Power Window Motor
Ignition Switch
Door Open Detection Switch
ECU–IG Fuse
Wire Harness
*1
Power window does not operate.
1
2
3
4
*2
Power window does not operate.
3
5
4
6
7
2
1
8
“One Touch Power Window System” does
not operate.
1
Only one window glass does not move.
1
2
3
4
“Window Lock System” does not operate
1
“Window Lock Illumination” does not light
up.
1
Key–off power window does not operate
1
2
4
5
3
6
*1
: Dook Lock does not operate.
*2
: Dook Lock is normal.
–
BODY ELECTRICAL SYSTEM
Power Window Control System
BE–157
LIQUID CRYSTAL INNER MIRROR
SYSTEM
Description
The liquid crystal inner mirror replaces the previous mirror, which mechanically switched between the “Day” and
“Night” settings, with liquid crystal inside the mirror which changes the brightness of the mirror surface. The com-
ponent parts of this system and their functions are shown in the table below.
Parts Name
Function
Liquid Crystal Inner
Mirror
Receives current from the fuse DOME and changes the surface brightness of the mirror
when switch is operated.
Key Unlock Warning
Switch
Opens the circuit so that the mirror can be operated only when the ignition key is set.
Parts Location
BE–164
–
BODY ELECTRICAL SYSTEM
Liquid Crystal Inner Mirror System
Wiring and Connector Diagrams
Parts Inspection
(Liquid Crystal Inner Mirror)
REMOVAL AND INSTALLATION OF
LIQUID CRYSTAL INNER MIRROR
(See page
INSPECTION OF LIQUID CRYSTAL
INNER MIRROR
INSPECT LIQUID CRYSTAL INNER MIRROR
(a) Using a screw driver, pry out the cover.
(b) Remove two screws and center visor.
(Operation)
(a) Connect
the positive (+) lead from the battery to terminal
1 and the negative (–) lead to terminal 2.
–
BODY ELECTRICAL SYSTEM
Liquid Crystal Inner Mirror System
BE–165
(b) Press the mirror switch and check if the mirrors surface
repeatedly becomes ”bright” and ”dark”.
If operation is not as specified, replace the liquid crystal inner
mirror.
(Circuit)
Disconnect the inner mirror connector and inspect the con-
nector on the wire harness side as shown.
Check for
Tester connection
Condition
Specified value
Voltage
2–Ground
Constant
Battery voltage
Continuity
1 Ground
Ignition key set
Continuity
Continuity
1–Ground
Ignition key removed
No continuity
If circuit is not as specified, refer to
and inspect the circuits connected to other parts.
(Key Unlock Warning Switch)
(See page
Troubleshooting
You will find the cause of trouble more easily by properly using the table shown below. In this table, the numbers
indicate the order of priority of the cruses of trouble. Check each part in the order shown. If necessary, replace
the part.
See page
BE–4
,21
BE–165
BE–26
–
–
Trouble
Parts
name
DOME Fuse
Liquid Crystal Inner Mirror
Key Unlock W
arning
Switch
Wire Harness
Liquid Crystal Inner Mirror does not operate.
1
2
3
4
BE–166
–
BODY ELECTRICAL SYSTEM
Liquid Crystal Inner Mirror System
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