1991 LEXUS SC400 Service Repair Manual

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Page 1249 of 4087

LEXUS SC400 1991 Service Repair Manual
Fuel Pump ECUAuto Antenna Motor and Relay
Power Seat ECU
(For Passengers Seat)
Power Seat ECU
(For Drivers Seat) CD Automatic Changer
Wireless Door Lock ECU
Moon Roof Control Relay
Locations of ECU

Fuel Pump ECUAuto Antenna Motor and Relay
Power Seat ECU
(For Passenger's Seat)
Power Seat ECU
(For Driver's Seat) CD Automatic Changer
Wireless Door Lock ECU
Moon Roof Control Relay
Locations of ECUs (Cont'd)
Many ECUs are mounted in this vehicle.
Take the following precautions during body repair to prevent damage to th\
e ECUs.

Before starting electric welding operations, disconnect the negative (-\
) terminal cable from the battery.
When the negative (-) terminal cable is disconnected from the battery, memory of the clock and audio
systems will be cancelled. So before starting work, make a record of the\
contents memorized by each
memory system. Then when work is finished, reset the clock and audio sys\
tems as before.
When the vehicle has tilt and telescopic steering, power seat and outsid\
e rear view mirror, which are all
equipped with memory function, it is not possible to make a record of th\
e memory contents.
So when the operation is finished, it will be necessary to explain this \
fact to the customer, and request
the customer to adjust the features and reset the memory.
Do not expose the ECUs to ambient temperatures above 80 °C (176 °F).
NOTICE: If it is possible the ambient temperature may reach 80°C (176°F) or, more, remove the ECUs
from the vehicle before starting work.
Be careful not to drop the ECUs and not to apply physical shocks to them\
.
5. COMPONENTS ADJACENT TO THE BODY PANELS
Various types of component parts are mounted directly on or adjacently to\
the body panels.
Strictly observe the following precautions to prevent damaging these com\
ponents and the body panels
during handling.
Before repairing the body panels, remove their adjacent components or ap\
ply protective covers over
the components.
Before prying components off using a screwdriver or a scraper, etc., attach protective tape to the tool
tip or blade to prevent damaging the components and the body paint.
Before removing components from the outer surface of the body, attach protective tape to the body to
ensure no damage to painted areas.
HINT: Apply touch-up paint to any damaged paint surfaces.
Before drilling or cutting sections, make sure that there are no wires, \
hoses, etc., on the reverse side.
INTRODUCTIONIN-9
WhereEverybodyKnowsYourName

Page 1250 of 4087

LEXUS SC400 1991 Service Repair Manual
GENERAL REPAIR INSTRUCTIONS
Work Precautions
SAFETY
1. Before performing repair work, checkfor fuel leaks. If a leak is found, be sure
to close the opening totally.
2. If it is necessary to use a fra

Page 1251 of 4087

LEXUS SC400 1991 Service Repair Manual
Proper and Efficient Work ProceduresREMOVAL
NUMBER OF SPOT WELDS AND PANEL POSITIONS
The number of spot welds and the panel positions to be
removed are shown for your reference.
HINT: See ºSymbols �

Page 1252 of 4087

LEXUS SC400 1991 Service Repair Manual
Thickness of
welded portionSize of plug hole
1.0 (0.04) under 5 (0.20)
f over
1.0 (0.04) - 1.5 (0.06) 6.5 (0.26)
f over
1.5 (0.06) over 8 (0.31)
f over
REFERENCE:
mm (in.)
PREPARATION FOR INSTALLA

Page 1253 of 4087

LEXUS SC400 1991 Service Repair Manual
INSTALLATION
PRE-WELDING MEASUREMENTS
Always take measurements
before installing underbody
or engine components
to insure correct assembly.
After installation, confirm
proper fit.POST-WELDING REF

Page 1254 of 4087

LEXUS SC400 1991 Service Repair Manual
ANTI-RUST TREATMENT
When replacing body panels, always apply body sealer, anti-rust agent or undercoat according to the re-
quirements of your country.
HINT: For further details, see the description

Page 1255 of 4087

LEXUS SC400 1991 Service Repair Manual
N01093
N01094
SUPPORT POSITION PANTOGRAPH JACK POSITION
Front Center of suspension crossmember. . . . . . . .
Rear Jack up support of differential carrier . . . . . . . . .
JACK POSITION
Jack
or Su

Page 1256 of 4087

LEXUS SC400 1991 Service Repair Manual
SERVICE SPECIFICATIONS
SERVICE DATA
ThermostatValve opening temperature80±845C176±183 5F
Valve liftat 95 5C (203 5F) 10 mm0.39 in.
Radiator capRelief valve opening pressureSTD74±103 kPa
(0.75±1.0

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