1991 LEXUS SC400 Service Repair Manual

engine oil tow inflation pressure handbrake wiper size technical specifications

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Page 889 of 4087

LEXUS SC400 1991 Service Repair Manual
INSPECTION OF WIPER MOTOR
INSPECT MOTOR(Operation at Low Speed)
Connect the positive (+) lead from the battery to terminal 3
and the negative (±) lead to terminal 1, check that the motor
operates

Page 890 of 4087

LEXUS SC400 1991 Service Repair Manual
Check forTester connectionConditionSpecified value
Continuity1±GroundConstantContinuity
Voltage2±GroundWiper switch position
(I iti it h ON)
HIGH or MISTBattery positive voltage2±Ground(Ignition s

Page 891 of 4087

LEXUS SC400 1991 Service Repair Manual
Check forTester connectionConditionSpecified value
VoltageA14±GroundIgnition switchpositionLOCK or ACCNo voltageA14±GroundIgnition switch positionONBattery positive voltage
ContinuityA6±GroundCons

Page 892 of 4087

LEXUS SC400 1991 Service Repair Manual
(Washer Hose and Nozzle)
REMOVAL AND INSTALLATION OF
WASHER HOSE AND NOZZLE
1. REMOVE WASHER HOSE(a) Remove fender liner.
(b) Disconnect washer hose from washer motor.
(c) Remove the hose clamps a

Page 893 of 4087

$LEXUS SC400 1991 Service Repair Manual TROUBLESHOOTING You will find the cause of trouble more easily by properly using the table \ shown below. In this table, the num- bers indicate the order priority of causes of trouble. Check each par$

Page 894 of 4087

LEXUS SC400 1991 Service Repair Manual
COMBINATION METER
±
BODY ELECTRICAL SYSTEM Combination MeterBE±95
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Page 895 of 4087

$LEXUS SC400 1991 Service Repair Manual DESCRIPTION The combination meter has various meters and gauges which show the vehicle\ s condition, warning lights which monitor abnormalities in the vehicle and inform the driver, indicator lights$

DESCRIPTION
The combination meter has various meters and gauges which show the vehicle'\
s condition, warning lights which
monitor abnormalities in the vehicle and inform the driver, indicator lights which inform the driver of the condition
of each part of vehicle, and a function for illumination and brightness ad\
justment of meters and gauges.
The component parts of this system and their functions are described in \
the following table.
Parts NameFunction
SpeedometerThe speedometer needle moves in accordance with signals from the speed s\
ensor to
indicate the vehicle's speed.
TachometerThe tachometer needle moves in accordance with signals from the igniter \
to indicate the
engine's speed.
Water Temperatrue
GaugeThe water temperature gauge's needle moves in accordance with signals from the send-
er gauge and indicates the temperature of the engine coolant.
Fuel GaugeThe fuel gauge needle moves in accordance with signals from the sender g\
auge, indicat-
ing the amount of fuel remaining in the fuel tank.
OdometerThe odometer counts the total distance traveled by the vehicle in accord\
ance with pulse
signals from the speed sensor.
Twin Trip Switch
The twin trip meter counts the distance traveled by the vehicle in accor\
dance with pulse
signals from the speed sensor. It can be reset using a switch and can be used to switch
between trip meters A and B.
Circuit Plate
This plate contains the circuitry for each meter and gauge and for each \
warning light and
indicator light, as well as an internal engine oil level warning drive c\
ircuit, drive circuits for
the odometer and trip meter and brightness adjustment circuitry for each\
indicator.
Speed SensorMounted in the transmission, this sensor outputs pulse signals to the co\
mbination meter
in accordance with the speed of the output shaft.
Twin Trip SwitchOperation of this switch switches between the A and B trip meters and se\
nds reset sig-
nals to the combination meter.
Water
Temperature Sender
GaugeThis sender converts engine coolant temperatures to a resistance value i\
n signal form to
the combination meter.
Fuel Sender GaugeThis sender converts the level of fuel remaining in fuel tank to resista\
nce value and
sends the resistance value in signal form to combination meter.
Rheostat Light
Control VolumeIn order to adjust the degree of illumination of the combination meter, the resistance val-
ue of the built±in variable resistor is sent to the combination meter\
and rheostat light
control.
Fuel Level Warning
SwitchWhen the level of fuel remaining falls below a predetermined level, cont\
inuity is estab-
lished with this switch, which is built into the fuel sender gauge, caus\
ing a warning light
to light up.
Low Oil Pressure
Warning SwitchThis switch is mounted on the engine block. Continuity is established in\
this switch when
the oil pressure is low, causing a warning light to light up.
Integration Relay (Seat
Belt Warning Relay)
This relay receives current from fuse GAUGE and DOME and is connected to\
each
buckle switch, door courtesy switch, key unlock warning switch and warni\
ng light. As
part of the seat belt warning system, it sounds a chime and lights a war\
ning light when
seat belts are unfastened. As part of the key unlock warning system, it \
sounds a chime
when the set conditions are fulfilled.
Light Failure SensorThis sensor senses when a bulb in rear combination light is burnt out an\
d lights up a
warning light.
BE±96±
BODY ELECTRICAL SYSTEM Combination Meter
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Page 896 of 4087

$LEXUS SC400 1991 Service Repair Manual Parts NameFunction Coolant Level Warning SwitchThis switch is installed in the radiator reservoir tank. It lights up a \ warning light when the coolant level becomes low. Engine Oil Level Warning Swi$

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