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 

DI–754

)

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 

DI–835

)

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 

DI–796

)

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 

DI–841

)

(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 

BE–60

)