Lexus SC300 / Lexus SC400. Service manual — part 141
INSPECTION OF MIRROR DEFOGGER
INSPECT MIRROR DEFOGGER
(a) Connect
the positive (+) lead from the battery to terminal
7 and the negative (–) lead to terminal 8.
(b) Check that the mirror becomes warm.
HINT: It will take a short time for the mirror to become warm.
If the mirror does not become warm, replace the mirror as-
sembly.
Troubleshooting
You will find the cause of trouble more easily using the table shown below. In this table, the number indicate
the order priority of the causes in trouble. Check each part in the order shown. If necessary, replace the parts.
See page
BE–4
,20
BE–4
,20
BE–4
,22
BE–172
BE–173
–
–
BE–173
–
–
BE–174
Trouble
Parts
name
HEA
TER Fuse
MIR–HTR Fuse
DEFOG Fuse
Defogger Switch
Defogger Relay
Wire Harness
Defogger Wires
CKE Coil
Mirror Defogger
All defogger systems do not operate.
1
1
2
3
4
Rear window defogger does not operate.
3
1
2
Mirror Defogger does not operate.
1
3
2
–
BODY ELECTRICAL SYSTEM
Defogger System
BE–175
SLIDING ROOF SYSTEM
Description
Standby Operation
Current flows from the DOME fuse to terminal A1 of the sliding roof control relay (hereafter called
relay).
When the ignition switch is ON, the current flows from the power window relay to terminal A3 of the
relay.
Operation
Roof Position
Function
Fully
Open
Fully
Closed
Momentary
Stop
Limit
Switch
No. 1
Limit
Switch
No. 2
Sliding
Roof
Control
Switch
Down
Up
Sliding
Period
Idling Period
CLOSE
DOWN
OPEN
UP
ON
ON
OFF
OFF
Tilting
Period
2. OPEN
operation
When the switch on the ”OPEN” side of the control switch is pushed, continuity is produced between termi-
nal A8 of the relay and body ground. Then the relay operates, the current flows through terminal A3 of the
relay
terminal B3
terminal 1 of the sliding roof motor
terminal 3
terminal B1 of the relay
terminal
A5
the body ground, and the motor starts to run in order to open the sliding roof.
3. CLOSE
operation
When the switch on the ”CLOSE” side of the control switch is pushed, continuity is produced between termi-
nal A7 of the relay and body ground. Then the relay operates, the current flows through terminal A3 of the
relay
terminal B1
terminal 3 of the sliding roof motor
terminal 1
terminal B3 of the relay
terminal
A5
the body ground, and the motor starts to run in order to close the sliding roof.
Momentary Stop
When the sliding roof reaches about 200 mm (7.87 in.) short of the fully closed position, the limit switch
is turned from ON to OFF, so there is not continuity between terminal B1 of the relay and body ground No.
1. As a result, the sliding roof stops at that position.
4.
TILT UP operation
When the switch on the ”UP” side of the control switch is pushed, continuity is produced between terminal
A6 of the relay and body ground. Then the relay operates, the current flows through terminal A3 of the relay
terminal B1
terminal 3 of the sliding roof motor
terminal 1
terminal B3 of the relay
terminal
A5
the body ground, and the motor starts to run in order to tilt up the sliding roof.
5.
TILT DOWN operation
When the switch on the ”DOWN” side of the control switch is pushed, continuity is produced between termi-
nal A2 of the relay and body ground. Then the relay operates, the current flows through terminal A3 of the
relay
terminal B3
terminal 1 of the sliding roof motor
terminal 3
terminal B1 of the relay
terminal
A5
the body ground, and the motor starts to run in order to tilt down the sliding roof.
BE–176
–
BODY ELECTRICAL SYSTEM
Sliding Roof System
6.
TILT UP REMINDER SYSTEM
If the ignition switch is turned from ON to OFF or ACC and the sliding roof remains tilted up, after 60 seconds
have elapsed or either the driver or passenger door is opened, a buzzer will sound for approx. 8 seconds
as a reminder that the sliding roof is tilted up.
Parts Location
–
BODY ELECTRICAL SYSTEM
Sliding Roof System
BE–177
Wiring and Connector Diagrams
BE–178
–
BODY ELECTRICAL SYSTEM
Sliding Roof System
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