Lexus SC300 / Lexus SC400. Manual — part 163
Parts Inspection
(Horn Switch)
INSPECTION OF HORN SWITCH
INSPECT HORN SWITCH
(a) Disconnect the negative (–) terminal from the battery.
(b) Remove the left and right covers from the steering wheel.
(c) Using a torx wrench, loosen the four bolts.
(d) Pull up the horn pad and place it on the steering column as
shown.
HINT: Do not disconnect the connector from the horn pad.
(e) Disconnect the connector from the slip ring.
(f) Check that there is no continuity between terminal 6 of the
connector and body ground.
(g) Check that there is continuity between terminal 6 of the
connector and body ground when the horn contact plate is
pressed against the steering spoke assembly.
If continuity is not as specified, repair or replace the steering
wheel or wire harness as necessary.
(h) Install the horn pad in place and using a torx wrench, tighten
the four bolts.
Torque: 7.1 N
⋅
m (72 kgf
⋅
cm, 62 in.
⋅
lbf)
(i)
Install the left and right covers.
(j)
Connect the negative (–) terminal to the battery.
(Horn)
INSPECTION OF HORN
INSPECT HORN OPERATION
Connect the positive (+) lead from the battery to the terminal
and negative (–) lead to the horn body and check that the
horn blows.
If operation is not as specified, replace the horn.
–
BODY ELECTRICAL SYSTEM
HORN SYSTEM
BE–263
HORN RELAY
HORN RELAY INSPECTION
INSPECT RELAY CONTINUITY AND OPERATION
If operation is not as specified, replace the relay.
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 these part.
See page
BE–4
, 21
BE–264
BE–263
BE–263
–
Trouble
Parts
name
HAZ–HORN Fuse
Horn Switch
Horn Switch
Horn
Wire Harness
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Horn system does not operate
ÑÑÑÑÑ
ÑÑÑÑÑ
1
ÑÑÑÑ
ÑÑÑÑ
2
ÑÑÑÑÑ
ÑÑÑÑÑ
3
ÑÑÑÑ
ÑÑÑÑ
4
ÑÑÑÑÑ
ÑÑÑÑÑ
5
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Horns blow all the time
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑ
ÑÑÑÑ
ÑÑÑÑ
1
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑ
2
ÑÑÑÑ
ÑÑÑÑ
ÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑ
3
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
One horn operates but other horn does not
Operate
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑ
ÑÑÑÑ
ÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑ
ÑÑÑÑ
ÑÑÑÑ
1
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑ
2
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Horns operate abnormally
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑ
ÑÑÑÑ
1
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑ
ÑÑÑÑ
2
ÑÑÑÑÑ
ÑÑÑÑÑ
3
BE–264
–
BODY ELECTRICAL SYSTEM
HORN SYSTEM
POWER SEAT CONTROL SYSTEM
(Driver’s seat)
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Driver’s Seat)
BE–265
DESCRIPTION
The Power Seat Control System carries out seat slide, front vertical, rear vertical, reclining and lumbar support
position adjustments electrically. Power seat switch and lumbar support switch.
In addition, operation of the memory switch makes it possible to store the positions of the slide, front vertical,
rear vertical and reclining adjustments in memory and return to the position.
The component parts of this system and their function are described in the following table.
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
Parts Name
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Function
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
Driver’s Seat ECU
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
The seat ECU controls power operation, memory operation, and position return
operation of the power seat. When input is received from the power seat switch,
the relay inside the ECU is controlled and the power seat operates. The seat
memory and position return are controlled by mutual communication between the
electrically operated Tilt and Telescopic ECU and the seat ECU.
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
Power Seat Switch
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Operation of this switch sends slide, front vertical, rear vertical, reclining signals
to ECU.
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
Driving Position
Memory and Return
Switch
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Memory and Return Signals are sent to the seat ECU via the Tilt and Telescopic
ECU.
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
Lumbar Support
Switch
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
This switch is supplied with power from the DOOR fuse. When the switch is
operated, power is supplied to the lumbar support motor controlling the direction
in which the motor turns and turning the current ON and OFF. This switch is not
connected to the ECU and the adjustment position cannot be stored in memory
for return operation.
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
Position Sensor
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
This sensor sends signals on the position of each motor (slide, front vertical, rear
vertical and reclining) to the ECU for use in memory and return.
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
*Motor
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
These motors operate on current from the driver’s seat ECU moving the various
parts of the seat directly. Each motor has a built–in circuit breaker.
*: Slide, Front Vertical, Rear Vertical, Lumbar Support and Reclining.
Motors contained in each seat are described in the following table.
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Motor
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Slide
ÑÑÑÑÑ
ÑÑÑÑÑ
Front
Vertical
ÑÑÑÑÑ
ÑÑÑÑÑ
Rear
Vertical
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Reclining
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Lumbar
Support
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Seat
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Motor
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑ
Vertical
Motor
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑ
Vertical
Motor
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
g
Motor
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Support
Motor
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Driver’s Seat
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
O*
ÑÑÑÑÑ
ÑÑÑÑÑ
O*
ÑÑÑÑÑ
ÑÑÑÑÑ
O*
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
O*
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
O
*: Operated by the memory and return functions.
BE–266
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Driver’s Seat)
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