Lexus SC300 / Lexus SC400. Manual — part 227
6. REMOVE
CLOCK
Remove 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 CIRCUIT
Disconnect 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
Connection
Check for
Tester connection
Condition
Specified value
A19 A15
Trip switch A/B
Push
Continuity
Trip switch
Continuity
A19–A15
Trip switch A/B
Free
No continuity
Trip switch
Continuity
A20 A15
Trip switch RESET
Push
Continuity
A20–A15
Trip switch RESET
Free
No continuity
DOME
Fuse
Voltage
A11–Ground
Constant
Battery positive voltage
Speed
S
Voltage
A13 A15
Ignition
switch
*
3
Revolve propeller shaft
0V
11V
Sensor
Voltage
A13–A15
switch
ON
*
3
Stop propeller shaft
0V or 11V
C1–Ground
P
Battery positive voltage
C2–Ground
Ignition
R
Battery positive voltage
Neutral start
it h
Voltage
C3–Ground
Ignition
switch
ON and
N
Battery positive voltage
switch
Voltage
C4–Ground
ON and
shift lever
D
Battery positive voltage
C5–Ground
shift lever
position
2
Battery positive voltage
C16–Ground
osition
L
Battery positive voltage
O/D OFF
Continuity
C18 Ground
O/D OFF switch
ON
Continuity
Switch
Continuity
C18–Ground
O/D OFF switch
OFF
No continuity
Alternator
Continuity
C15–Ground
Engine stop
Continuity
”L” terminal
Voltage
C14–Ground
Engine running
Battery positive voltage
Fuel
Continuity
A7 Ground
Fuel remainder
Full
No continuity
Sender
Continuity
A7–Ground
Fuel remainder
Empty
Continuity
Gauge
Full, Approx. 79.3 mm
(3.12 in.)
Approx. 6
Resistance
A8–C8
Float
position
1/2, Approx. 193.1 mm
(76.0 in.)
Approx. 32.5
Empty, Approx. 308.1 mm
(12.13 in.)
Approx. 97
*Window
washer level
Continuity
B9–Ground
ON (float down)
Continuity
washer level
warning
switch
Continuity
B9 Ground
(Canada)
OFF (float up)
No continuity
Brake fluid
Brake fluid level
ON (float down)
Continuity
Level warning
Brake fluid level
warning SW
OFF (float up)
No continuity
SW and
Parking brake
SW
Continuity
C13–Ground
Parking brake
ON (Depress the Ped-
al))
Continuity
SW
Parking brake
SW
OFF (Release the Ped-
al)
No continuity
Low oil
Pressure
Continuity
C19 Ground
Engine condition
Running
No continuity
Pressure
Warning SW
Continuity
C19–Ground
Engine condition
Stop
Continuity
Door courtesy
Continuity
C12 Ground
Driver’s and
Open (ON)
Continuity
y
Switch
Continuity
C12–Ground
Driver s and
passenger’s door
Closed (OFF)
No continuity
IGN fuse
Voltage
C14 Ground
Ignition switch
ON
Battery positive voltage
Voltage
C14–Ground
Ignition switch
LOCK or ACC
No voltage
CIG fuse
Voltage
A6 Ground
Ignition switch
ACC or ON
Battery positive voltage
Voltage
A6–Ground
Ignition switch
LOCK or START
No voltage
BE–107
–
BODY ELECTRICAL SYSTEM
Combination Meter
Connection
Check for
Tester connection
Condition
Specified value
Turn signal
Hazard warning switch ON
Battery positive
Turn signal
SW and
B 16 Ground
Hazard warning switch ON
Battery ositive
voltage
↔
0V
Hazard
B–16–Ground
IG SW ON and turn signal SW ”Left”
Battery positive
Warning
S i h
Voltage
IG SW ON and turn signal SW ”Left”
Battery ositive
voltage
↔
0V
Switch
Voltage
Hazard warning switch ON
Battery positive
B 17 Ground
Hazard warning switch ON
Battery ositive
voltage
↔
0V
B–17–Ground
IG SW ON and turn signal SW ”Right”
Battery positive
IG SW ON and turn signal SW ”Right”
Battery ositive
voltage
↔
0V
Headlight
Li ht
t l SW
Dimmer SW ”HI” or
Battery positive
Headlight
Voltage
B7–Ground
Light control SW
”HEAD”
Dimmer SW HI or
”Flash”
Battery ositive
voltage
Voltage
B7–Ground
”HEAD”
Dimmer SW ”LO”
No voltage
Continuity
B6–Ground
Light control SW
”HEAD”
Dimmer SW ”HI” or
”Flash”
Continuity
Continuity
B6 Ground
”HEAD”
Dimmer SW ”LO”
No continuity
Igniter
Voltage
A9–Ground
Engine Running
Voltage
fluctuates
ECT pattern
Voltage
B4 Ground
IG SW ON and ECT pattern
PWR
Battery positive voltage
ECT attern
Select switch
Voltage
B4–Ground
IG SW ON and ECT attern
select SW position
NORM No voltage
Engine oil
Oil temperature below approx. 55
°
C (131
°
F)
Continuity
g
Level warn-
ing Switch
Continuity
B8–Ground
Oil temperature
above approx. 55
°
C
ON (float up)
Continuity
g
Continuity
B8 Ground
above a
rox. 55 C
(131
°
F) and SW
position
OFF (float off)
No continuity
GAUGE fuse
Voltage
A1 Ground
Ignition switch
ON
Battery positive voltage
Voltage
A1–Ground
Ignition switch
position
LOCK, ACC, START
No voltage
Neutral Start
Voltage
A12–Ground
Ignition switch
position
START (”P” or ”N”
range)
Battery positive voltage
switch
Voltage
A12 Ground
position
LOCK, ACC, ON
No voltage
ECU–B
Voltage
C11 Ground
Ignition switch
ON
Battery positive voltage
Fuse
Voltage
C11–Ground
Ignition switch
position
LOCK, ACC, START
No voltage
Rheostat
Li ht
t l
ON (Rheostat knob
t
d
iti
B tt
lt
Light control
Volume
Light control SW
turned any position
except fully clock-
Battery voltage or
5V or more
Volume
Voltage
A2–Ground
g
HEAD or TAIL and
rheostat volume
except fully clock-
wise)
5V or more
Voltage
A2 Ground
rheostat volume
knob position
OFF (Rheostat knob)
turned fully clock
No voltage
knob osition
turned fully clock-
wise)
No voltage
Ground
A8–Ground
Constant
Continuity
Continuity
A10–Ground
Constant
Continuity
Continuity
A22–Ground
Constant
Continuity
A23–Ground
Constant
Continuity
*1
Jack up the vehicle.
*2
Shift lever position is ”P” range.
If circuit is not as specified, refer to
wiring diagrams
and inspect the circuits connected to other parts.
BE–108
–
BODY ELECTRICAL SYSTEM
Combination Meter
(Odometer and Twin Trip Switch)
REMOVAL AND INSTALLATION OF
ODOMETER AND TWIN TRIP SWITCH
(See page
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 Meter
BE–109
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