Lexus GS300/400 (2000 year). Service manual — part 96
I04091
F
E
1
2
1/2
I04094
A
D
C
B
I01277
Battery
Ignition
Switch
Warning Light
Wire Harness Side
1
BE–98
–
BODY ELECTRICAL
COMBINATION METER
2399
13.
INSPECT FUEL SUB SENDER GAUGE RESISTANCE
Measure the resistance between terminals 1 and 2 for each
float position.
Float position mm (in.)
Resistance (
Ω
)
F: Approx. 9.5 (0.37)
±
3 (0.12)
Approx. 2.0
±
1.0
1/2: Approx. 110.5 (4.35)
±
3 (0.12)
Approx. 33.0
±
3.0
E: Approx.
206.5 (8.13) ±
3 (0.12)
Approx. 61.3
±
1.0
If resistance value is not as specified, replace the sub sender
gauge.
14.
INSPECT ENGINE COOLANT TEMPERATURE RE-
CEIVER GAUGE OPERATION (See page
15.
INSPECT ENGINE COOLANT TEMPERATURE RE-
CEIVER GAUGE RESISTANCE
Measure the resistance between terminals with fixing pointer to
the stopper.
Tester connection
Resistance (
Ω
)
A – B
140 – 185
C – D
130 – 175
If resistance value is not as specified, replace the receiver
gauge.
HINT:
This circuit includes the diode.
If resistance value is not as specified, replace the receiver
gauge.
16.
INSPECT LOW OIL PRESSURE WARNING LIGHT
(a)
Disconnect the connector from the warning switch and
ground terminal on the wire harness side connector.
(b)
Turn the ignition switch ON and check that the warning
light lights up.
If the warning light does not light up, test the bulb.
I01278
I01279
Battery
Ignition
Switch
Warning Light
I04095
OFF
ON
I04096
–
BODY ELECTRICAL
COMBINATION METER
BE–99
2400
17.
INSPECT LOW OIL PRESSURE SWITCH CONTINUITY
(a)
Disconnect the connector from the switch.
(b)
Check that continuity exists between terminal and ground
with the engine stopped.
(c)
Check that no continuity exists between terminal and
ground with the engine running.
HINT:
Oil pressure should be over 24.5 kPa (0.25 kgf/cm
2
, 3.55 psi).
If operation is not as specified, replace the switch.
18.
INSPECT BRAKE WARNING LIGHT
(a)
Disconnect the connector from the brake fluid warning
switch.
(b)
Release the parking brake pedal.
(c)
Connect the terminals on the wire harness side of the lev-
el warning switch connector.
(d)
Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or wire har-
ness.
19.
INSPECT BRAKE FLUID LEVEL WARNING SWITCH
CONTINUITY
(a)
Remove the reservoir tank cap and strainer.
(b)
Disconnect the connector.
(c)
Check that no continuity exists between the terminals with
the switch OFF (float up).
(d)
Use siphon, etc. to take fluid out of the reservoir tank.
(e)
Check that continuity exists between the terminals with
the switch ON (float down)
(f)
Pour the fluid back in the reservoir tank.
If operation is not as specified, replace the switch.
20.
INSPECT BRAKE FLUID LEVEL WARNING SWITCH
CIRCUIT (See page
)
21.
INSPECT PARKING BRAKE SWITCH CONTINUITY
(a)
Check that continuity exists between the terminal and
switch body with the switch ON (switch pin released).
(b)
Check that no continuity exists between the terminal and
switch body with the switch OFF (switch pin pushed in).
If operation is not as specified, replace the switch or inspect
ground point.
22.
INSPECT PARKING BRAKE SWITCH CIRCUIT
(See page
I04097
Battery
Ignition
Switch
Warning Light
Wire Harness Side
I04098
Wire Harness Side
I04099
Battery
Ignition
Switch
Warning Light
Wire Harness Side
BE–100
–
BODY ELECTRICAL
COMBINATION METER
2401
23.
INSPECT REAR LIGHTS WARNING LIGHT
(See page
(a)
Disconnect the connector from the light failure sensor and
ground terminal 3 on the wire harness side connector.
(b)
Start the engine, check that the warning light lights up.
If the warning light does not light up, inspect the bulb or wire har-
ness.
24.
INSPECT LIGHT FAILURE SENSOR CIRCUIT
Disconnect connector from the light failure sensor and inspect
the connectors on the wire harness side as follows.
Tester connection
Condition
Specified condition
1 – Ground
Constant
Continuity *
2 – Ground
Constant
Continuity *
6 – Ground
Constant
Continuity *
7 – Ground
Constant
Continuity *
11 – Ground
Constant
Continuity
12 – Ground
Constant
Continuity *
5 – Ground
Light control switch OFF
No voltage
5 – Ground
Light control switch in TAIL or HEAD
Battery positive voltage
8 – Ground
Ignition switch in LOCK or ACC
No voltage
8 – Ground
Ignition switch ON
Battery positive voltage
9, 10 – Ground
Stop light switch OFF
No voltage
9, 10 – Ground
Stop light switch ON
Battery positive voltage
*: There is resistance because this circuit is grounded through
the bulb.
If circuit is as specified, replace the relay.
If circuit is not as specified, wiring diagram and inspect the cir-
cuits connected to other parts.
25.
INSPECT ENGINE OIL LEVEL WARNING LIGHT
(a)
Disconnect the connector from the switch.
(b)
Run the engine.
(c)
Turn the ignition switch ON, check that the warning light
lights up approximatery 40 seconds later.
If the warning light does not light up, inspect bulb or wire har-
ness.
I04102
ON
OFF
I04103
ON
OFF
I04104
Wire Harness Side
I01286
Battery
Warning Light
–
BODY ELECTRICAL
COMBINATION METER
BE–101
2402
26.
INSPECT ENGINE OIL LEVEL WARNING SENSOR
(a)
Check that continuity exists between terminals with the
switch to below 40
°
C (104
°
F). (Warning switch ON)
(b)
Heat the switch to above 60
°
C (140
°
F) in an oil bath.
(c)
Check that there is continuity between terminals with the
switch ON (float up).
(d)
Check that there is no continuity between terminals with
the switch OFF (float down).
If operation is not as specified, replace the switch.
27.
INSPECT ENGINE OIL LEVEL WARNING SENSOR
CIRCUIT
Disconnect the switch connector and inspect the connector on
wire harness side, as shown.
Tester connection
Condition
Specified condition
2 – Ground
Constant
Continuity
If continuity is not as specified, inspect the wire harness or
ground point.
28.
INSPECT OPEN DOOR WARNING LIGHT
Disconnect the connector from the door courtesy switch and
ground terminal 1 on the wire harness side, and check that the
warning light lights up.
If the warning light does not light up, inspect the bulb or wire har-
ness.
29.
INSPECT DOOR COURTESY SWITCH CONTINUITY
AND CIRCUIT (See page
)
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