clock LEXUS SC400 1991 Service User Guide

CLOCK
Troubleshooting
HINT: Troubleshoot the clock according to the table below.
Clock will not operate1
Clock loses or gains time2
1CLOCK WILL NOT OPERATE
(a) Check that the battery voltage is 10±16 V.
If voltage is not as specified, replace the battery.
(b) Check that the DOME fuse is not blown.
If the fuse is blown, replace the fuse and check for short.
(c) Troubleshoot the clock as follows.
HINT: Inspect the connector on the wire harness side.
BE±194
±
BODY ELECTRICAL SYSTEM Clock
Is there battery voltage between terminal
+B and body ground?
Is there continuity between terminal GND
and body ground?
Replace clock. Open or
short circuit in wire harness between
terminal +B and DOME fuse.
Open circuit in wire harness between
terminal GND and body ground.
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2CLOCK LOSES OR GAINS TIME
(a) Check that the battery voltage is 10±16 V.
If voltage is not as specified, replace the battery.
(b) Inspect the error of the clock.
Allowable error (par day): + 2.0 seconds
If the error exceeds the allowable error, replace the clock.
(c) Check if the clock adjusting button is sticking in position
and has failed to return.
If the button has not returned, repair or replace the clock.
(d) troubleshoot the clock as follows.
HINT: Inspect the connector on the wire harness side.
±
BODY ELECTRICAL SYSTEM ClockBE±195
Is there 10 ± 16 V between terminal +B and
body ground?
Adjust or replace clock. Locate cause, and repair or recharge
battery.
Below 10 V
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5. REMOVE COMBINATION SWITCH ASSEMBLY(a) Remove four screws.
(b) Disconnect connectors.
(See page BE±41)
HINT: Since the airbag connector has a 2±stage lock, remove
the 1st stage lock, and disconnect the connector.
(c) Remove combination switch assembly from steering column.
HINT: Pull the wire harness spool body to forward and re-
move wire harness spool body from steering column.
INSPECTION OF COMBINATION SWITCH
For installation, follow the removal procedure in reverse.
(MAIN POINT OF INSTALLATION)
1. ADJUSTMENT OF SPIRAL CABLE (a) Check that the front wheels are facing straight ahead.
(b) Turn the spiral cable counterclockwise by hand until itbecomes harder to turn the cable.
(c) Then rotate the spiral cable clockwise about 3 turns to align the red mark.
HINT:
w The spiral cable will rotate about 3 turns to either left or
right of the center.
w The connector should be straight up.
(d) Install the steering wheel so that the match marks will not be misaligned.
2. INSTALL STEERING SET NUT
Torque: 35 N Vm (360 kgf Vcm, 26 ft Vlbf)
3. INSTALL STEERING WHEEL CENTER PAD
Torque the torx screws.
Torque: 7.1 N Vm (75 kgf Vcm, 62 in.lbf) V
BE±40±
BODY ELECTRICAL SYSTEM Lighting System
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Parts Inspection ± ILLUMINATION
LIGHT SYSTEM
(Rheostat Light Control Volume)
REMOVAL AND INSTALLATION OF
RHEOSTAT LIGHT CONTROL VOLUME
(See page BE±103 )
INSPECTION OF RHEOSTAT LIGHT
CONTROL VOLUME
1. INSPECT RHEOSTAT LIGHT CONTROL VOLUME
(Resistance)
Inspection resistance between terminals.
Tester
ConnectionConditionSpecified value
3±4ConstantApprox. 10 k

1±3Rheostat knobA
1±3turned clockwiseBApprox. 10 k
" 0

If resistance is not as specified, replace the rheostat light con-
trol volume.
(Taillight Switch/Continuity)
Inspect continuity between terminals.
If operation is not as specified, replace the rheostat light con-
trol volume.
±
BODY ELECTRICAL SYSTEM Lighting SystemBE±73
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6. REMOVE CLOCKRemove the two screws and the clock.
7. REMOVE FUEL AND TEMPERATURE GAUGE Release the four lugs, and separate the two gauges from the
meter lens.
ASSEMBLY OF COMBINATION METER
ASSEMBLY
For installation, follow the removal procedure in reverse.
INSPECTION OF COMBINATION METER
ASSEMBLY
1. INSPECT COMBINATION METER WIRING CIRCUITDisconnect connector A, connector B and connector C from
the combination meter and inspect the connectors on the
wire harness side as follows.
BE±106
±
BODY ELECTRICAL SYSTEM Combination Meter
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ConnectionCheck forTester connectionConditionSpecified value
Turn signalHazard warning switch ONBattery positiveTurn signal
SW andB 16 Ground
Hazard warning switch ONBattery ositive
voltage e 0V
HazardB±16±Ground
IG SW ON and turn signal SW ºLeftºBattery positive
Warning
Si hVoltage
IG SW ON and turn signal SW ºLeftºBattery ositive
voltage e 0V
SwitchVoltage
Hazard warning switch ONBattery positive
B 17 Ground
Hazard warning switch ONBattery ositive
voltage e 0VB±17±Ground
IG SW ON and turn signal SW ºRightºBattery positiveIG SW ON and turn signal SW ºRightºBattery ositive
voltage e 0V
HeadlightLi ht t l SWDimmer SW ºHIº orBattery positiveHeadlight
VoltageB7±GroundLight control SW
ºHEADº
Dimmer SW HI or
ºFlashº
Battery ositive
voltageVoltageB7±GroundºHEADºDimmer SW ºLOºNo voltage
ContinuityB6±GroundLight control SW
º
HEADº
Dimmer SW ºHIº or
ºFlashºContinuityContinuityB6 GroundºHEADºDimmer SW ºLOºNo continuity
IgniterVoltageA9±GroundEngine RunningVoltage
fluctuates
ECT patternVoltageB4 GroundIG SW ON and ECT patternPWRBattery positive voltageECT attern
Select switchVoltageB4±GroundIG SW ON and ECT attern
select SW positionNORMNo voltage
Engine oilOil temperature below approx. 55 5C (131 5F)Continuityg
Level warn-
ing Switch
ContinuityB8±Ground
Oil temperature
above approx. 55 5CON (float up)ContinuitygContinuityB8 Groundabove a rox. 55 C
(131 5F) and SW
positionOFF (float off)No continuity
GAUGE fuseVoltageA1 GroundIgnition switchONBattery positive voltageVoltageA1±GroundIgnition switch
positionLOCK, ACC, STARTNo voltage
Neutral StartVoltageA12±GroundIgnition switch
position
START (ºPº or ºNº
range)Battery positive voltage
switch
VoltageA12 GroundpositionLOCK, ACC, ONNo voltage
ECU±BVoltageC11 GroundIgnition switchONBattery positive voltage
FuseVoltageC11±GroundIgnition switch
positionLOCK, ACC, STARTNo voltage
Rheostat
Li ht t l
ON (Rheostat knob
t d itiBtt ltLight control
VolumeLight control SWturned any position
except fully clock-
Battery voltage or
5V or moreVolume
VoltageA2±Ground
g
HEAD or TAIL and
rheostat volume
except fully clock-
wise)5V or more
VoltageA2 Groundrheostat volume
knob positionOFF (Rheostat knob)
turned fully clockNo voltageknob ositionturned fully clock-
wise)No voltage
GroundA8±GroundConstantContinuity
ContinuityA10±GroundConstantContinuityContinuityA22±GroundConstantContinuity
A23±GroundConstantContinuity
*1 Jack up the vehicle.*2 Shift lever position is ºPº range.
If circuit is not as specified, refer to BE±100 wiring diagrams
and inspect the circuits connected to other parts.
BE±108
±
BODY ELECTRICAL SYSTEM Combination Meter
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3. BLEED MASTER CYLINDERHINT: If the master cylinder has been disassembled or if the
reservoir becomes empty, bleed the air from the master cylin-
der.
(a) Disconnect the brake lines from the master cylinder.
(b) Slowly depress the brake pedal and hold it.
(c) Block off the outer holes with your fingers, and release the brake pedal.
(d) Repeat (b) and (c) 3 or 4 times.
4. BLEED BRAKE LINE
(a) Connect the vinyl tube to the brake caliper.
(b) Depress the brake pedal several times, then loosen the
bleeder plug with the pedal held down.
(c) At the point when fluid stops coming out, tighten the bleeder plug, then release the brake pedal.
(d) Repeat (b) and (c) until all the air in the fluid has been bled
out.
(e) Repeat the above procedure to bleed the air out of the brake
line for each wheel.
Torque: 11 N Vm (110 kgf Vcm, 8 ft Vlbf)
5. CHECK FLUID LEVEL IN RESERVOIR
Check the fluid level and add fluid if necessary.
Fluid:
SAE J1703 or FMVSS NO.116DOT3
6. INSTALL RESERVOIR CAP
(a) Align the matchmark on the reservoir cap with the matchmark
on the ªopenº side of reservoir.
(b) Push down on the reservoir cap and turn it clockwise until it locks.
(c) Check that the matchmark on the reservoir cap is now aligned with the matchmark on the ªcloseº side of the
reservoir.
±
BRAKE SYSTEM CHECK AND ADJUSTMENTBR±9
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MASTER CYLINDER ASSEMBLY
BR0EH±05
1. APPLY LITHIUM SOAP BASE GLYCOL GREASE TORUBBER PARTS INDICATED BY ARROWS
2. INSTALL PISTONS
NOTICE: Be careful not to damage the rubber lips on the pis-
tons.
(a) Insert the 2 pistons straight in, not at an angle.
NOTICE: If inserted at an angle, there is a possibility that the
cylinder bore could be damaged.
(b) Push in the piston with a screwdriver and install the snap ring
with snap ring pliers.
HINT: Tape the screwdriver tip before use.
3. w/ TRAC: INSTALL NO. 1 PISTON STOPPER BOLT
Using a screwdriver, push the piston in all the way and install
the No. 1 piston stopper bolt over a new gasket.
Torque: 10 N Vm (100 kgf Vcm, 7 ft Vlbf)
4. INSTALL NO. 2 PISTON STOPPER BOLT
Using a screwdriver, push the piston in all the way and install
the No. 2 piston stopper bolt over a new gasket.
Torque: 10 N Vm (100 kgf Vcm, 7 ft Vlbf)
5. INSTALL 2 GROMMETS
6. INSTALL RESERVOIR
(a) Install the strainer to the reservoir.
(b) Push the reservoir onto the cylinder.
(c) Install the set screw while pushing on the reservoir.
Torque: 1.7 N Vm (17.5 kgf Vcm, 15.2 in. Vlbf)
7. INSTALL RESERVOIR CAP
(a) Align the matchmark on the reservoir cap with the matchmark
on the ªopenº side of reservoir.
(b) Push down on the reservoir cap and turn it clockwise until it locks.
(c) Check that the matchmark on the reservoir cap is now aligned with the matchmark on the ªcloseº side of the
reservoir.
BR±16
±
BRAKE SYSTEM MASTER CYLINDER
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ON±VEHICLE INSPECTION
1. INSPECT BATTERY SPECIFIC GRAVITY ANDELECTROLYTE LEVEL
(a) Check the specific gravity of each cell.
Standard specific gravity:
1.27±1.29 when fully charged at 20 5C (68 5F)
If gravity is less than specification, charge the battery.
(b) Check the electrolyte quantity of each cell.
If insufficient, refill with distilled (or purified) water.
HINT: Check the indicator as shown in the illustration.
2. CHECK BATTERY TERMINALS, FUSIBLE LINKS AND FUSES
(a) Check that the battery terminals are not loose orcorroded.
(b) Check the fusible links and fuses for continuity.
H±fuse: ALT 150A AM1 100A
AM2 30A
M±fuse: IG SW 40A
Fuse: IGN 7.5A ENGINE 7.5A
INJ 30A
3. INSPECT DRIVE BELTHINT: A belt tensioner is used, so checking the belt tension
is not necessary.
(a) Visually check the drive belt for excessive wear, frayedcords, etc.
If necessary, replace the drive belt.
HINT:
w Cracks on rib side of a drive belt are considered
acceptable. If the drive belt has chunks missing from the
ribs, it should be replaced.
w The drive belt tension can be released by turning the
belt tensioner counterclockwise. The pulley bolt for the
belt tensioner has a left±hand thread.
±
CHARGING SYSTEM On±Vehicle InspectionCH±5
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ALTERNATOR
COMPONENTS FOR REMOVAL AND
INSTALLATION
REMOVAL OF ALTERNATOR
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OFBATTERY
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ºLOCKº position and the negative (±) termi-
nal cable is disconnected from the battery.
2. REMOVE ENGINE UNDER COVER
3. REMOVE DRIVE BELT
Loosen the belt tension by turning the drive belt tensioner
counterclockwise, and remove the drive belt.
HINT: The pulley bolt for the belt tensioner has a left±hand
thread.
±
CHARGING SYSTEM AlternatorCH±9
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