Lexus SC300 / Lexus SC400. Manual — part 142
Parts Inspection
(Power Window Main Relay)
INSPECTION OF POWER WINDOW MAIN
RELAY
(See Power Window Main Relay on page
(Sliding Roof Switch)
REMOVAL AND INSTALLATION OF
SLIDING ROOF SWITCH
(See Sliding Roof on page
INSPECTION OF SLIDING ROOF SWITCH
INSPECT SWITCH CONTINUITY
Terminal
Switch position
SLIDE
TILT
OFF
OPEN
CLOSE
OFF
UP
DOWN
If continuity is not as specified, replace the switch.
(Sliding Roof Motor)
REMOVAL AND INSTALLATION OF
MOTOR
(See Sliding Roof on page
INSPECTION OF MOTOR
INSPECT MOTOR OPERATION
(a) Disconnect the connector which has 3 terminals and
inspect on the clamped connector side.
(b) Connect
the positive (+) lead from the battery to terminal
1 and negative (–) lead to terminal 3 and check that the
motor turns clockwise.
(c) Connect
the positive (+) lead from the battery to terminal
3 and negative (–) lead to terminal 1 and check that the
motor turns counterclockwise.
If operation is not as specified, replace the motor.
(d) Connect the connector.
–
BODY ELECTRICAL SYSTEM
Sliding Roof Sysytem
BE–179
(Sliding Roof Control Relay)
REMOVAL AND INSTALLATION OF
SLIDING ROOF CONTROL RELAY
(See Sliding Roof on page
INSPECTION OF SLIDING ROOF
CONTROL RELAY
INSPECT CONTROL RELAY CIRCUIT
Disconnect the connector from the relay and inspect the con-
nector on the wire harness side as shown in the chart.
Check for
Test connection
Condition
Specified value
Continuity
A2 – Ground
Sliding roof control
OFF or UP
No continuity
y
g
switch position (TILT)
DOWN
Continuity
A6 – Ground
Sliding roof control
OFF or DOWN
No continuity
g
switch position (TILT)
UP
Continuity
A7 – Ground
Sliding roof control
OFF or OPEN
No continuity
g
switch position (SLIDE)
CLOSE
Continuity
A8 – Ground
Sliding roof control
OFF or CLOSE
No continuity
g
switch position (SLIDE)
OPEN
Continuity
B1 – Ground
Constant
No continuity
B1 – B3
Constant
Continuity
B2 – Ground
No. 1 limit switch
position
OFF (Sliding roof tilt up or
approx. 200 mm (7.87 in.)
opened)
No continuity
position
ON (Except for conditions
mentioned above)
Continuity
B3 – Ground
Constant
No continuity
B4 – Ground
Constant
Continuity
B5 – Ground
Constant
Continuity
B6 – Ground
No. 2 limit switch
OFF (Sliding roof closed)
No continuity
position
ON (Sliding roof opened)
Continuity
Voltage
A1 – Ground
Constant
Battery voltage
g
A3 – Ground
Ignition switch position
LOCK or ACC ( * )
No voltage
g
ON
Battery voltage
(*) Except within 60 seconds after turning the ignition key to the OFF position and both the driver’s door and
the passenger’s door are closed.
If circuit is as specified, replace the relay.
BE–180
–
BODY ELECTRICAL SYSTEM
Sliding Roof System
(Sliding Roof Limit Switch)
REMOVAL AND INSTALLATION OF LIMIT
SWITCH
(See Sliding Roof on page
INSPECTION OF LIMIT SWITCH
1.
INSPECT LIMIT SWITCH CIRCUIT
Terminal
Switch position
OFF (SW pin released)
OFF (SW pin released)
ON (SW pin pushed in)
ON (SW pin pushed in)
No. 1 limit
switch
No. 2 limit
switch
If continuity is not as specified, replace the switch.
2.
INSPECT MOTOR WIRE CIRCUIT
(a) Check that there is continuity between terminals A1 and
B3.
(b) Check that there is continuity between terminals A2 and
B4.
(c) Check that there is continuity between terminals A3 and
B1.
If continuity is not as specified, replace the switch.
(Theft Deterrent and Door Lock Control
ECU)
(See page
(Door Courtesy Switch)
(See page
–
BODY ELECTRICAL SYSTEM
Sliding Roof System
BE–181
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 necessary, replace
the part.
See page
BE–4
,21
BE–4
,21
BE–4
,20
BE–4
,20
BE–156
BE–152
BE–180
BE–179
BE–179
–
–
BE–181
BE–26
BE–79
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
Sliding Roof Control Relay
Sliding Roof Switch
Sliding Roof Motor
Sliding Rood Motor (Stones to foreign material
trapped in motor assembly)
Limit Switch
Ignition Switch
Door Courtesy Switch
ECU–IG Fuse
Wire Harness
*1
Sliding roof system does not operate.
1
2
3
4
*2
Sliding roof system does not operate.
3
5
4
6
7
8
9
2
1
10
Sliding roof system operates abnormally.
1
3
2
4
Sliding roof system stops operation half way.
1
3
4
2
Buzzer does not sound.
1
2
3
Buzzer sounds abnormally.
1
“Key–off Sliding Roof” operation does not
operate.
1
2
4
5
3
6
*1
: Door Lock does not operate
*2
: Door Lock is normal
BE–182
–
BODY ELECTRICAL SYSTEM
Sliding Roof System
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