1991 LEXUS SC400 flat tire

(Odometer and Twin Trip Switch)
REMOVAL AND INSTALLATION OF
ODOMETER AND TWIN TRIP SWITCH
(See page BE±103)
INSPECTION OF ODOMETER AND TWIN
TRIP SWITCH
INSPECT ODOMETER AND TWIN TRIP SWITCH
(Continuity)
Inspect continuity between terminals.
If continuity is not as specified, replace the odometer and twin
trip switch.
(Speedometer)
INSPECTION OF SPEEDOMETER
INSPECT SPEEDOMETER (ON±VEHICLE)Using a speedometer tester, inspect the speedometer for al-
lowable indication error and check the operation of the odom-
eter.
HINT: Tire wear and tire over or under inflation will increase
the indication error.
If error is excessive, replace the speedometer.
±
BODY ELECTRICAL SYSTEM Combination MeterBE±109
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2. REMOVE STEERING WHEEL PAD CONNECTORRemove the connector on the steering wheel pad rear sur-
face from the inflater cover.
3. FIX STEERING WHEEL PAD TO DISC WHEEL WITH TIRE
(a) Install the 4 bolts with washer in the 4 bolt holes in the steering wheel pad.
Bolt:
L 35.0 mm (1.398 in.) M 6.0 mm (0.236 in.) Pitch 1.0 mm
(0.039 in.)
NOTICE:
wTighten the bolts by hand until the bolts become difficult
to turn.
w Do not tighten the bolts too much.
(b) Using a service±purpose wire harness for vehicle tie down
the steering wheel pad to the disc wheel.
Wire harness: Stripped wire harness section
1.25 mm
2 or more (0.0019 in2 or more)
HINT: To calculate the square of the stripped wire harness
section ±±
Square = 3.14 x (Diameter)2 divided by 4
CAUTION: If a wire harness which is too thin or some oth-
er thing is used to tie down the steering wheel pad it may
be snapped by the chock when the airbag is deployed,
this is highly dangerous. Always use a wire harness for
vehicle use which is at least 1.25 mm
2 (0.0019 in2.).
(1) Using 3 wire harnesses, wrap the wire harnesses at least 2 times each around the bolts installed on the left and
right sides of the steering wheel pad.
CAUTION:
w Tightly wind the wire harness around the bolts so that
there is no slack.
w If there is slackness in the wire harness, the steering
wheel pad may come loose due to the shock when the
airbag is deployed, this is highly dangerous.
RS±24±
SUPPLEMENTAL RESTRAINT SYSTEM STEERING WHEEL PAD AND SPIRAL CABLE
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GENERAL INSPECTION
SA19Y±01
1. INSPECT TIRE
(a) Check the tires for wear and for the proper inflation pressure.Cold tire inflation pressure (SC400):
 

Tire size 


Front
kPa (kg/cm2, psi)
 


Rear
kPa (kg/cm2, psi)
 P225/55R16 93V 220 (2.2, 32) 220 (2.2, 32)
Cold tire inflation pressure (SC300):
 

Tire size 

Front
kPa (kg/cm2, psi) 

Rear
kPa (kg/cm2, psi) 

P215/60R15 94V
 

210 (2.1, 30)
 

210 (2.1, 30)
 P215/60R15 93V  
(b) Check the tire runout.
Tire runout:
 SC400 Less then 1.4 mm (0.055 in.)
 SC300 Less then 1.0 mm (0.039 in.)
2. ROTATING TIRESNOTICE: The wheel assemblies must be rotated only be-
tween the front and rear.
3. INSPECT WHEEL BALANCE
(a) Check and adjust the Off±the±car balance.
(b) If necessary, check and adjust the On±the±car balance.
Unbalance after adjustment: 8.0 g (0.018 lb) or less
±
SUSPENSION AND AXLE GENERAL INSPECTIONSA±3
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