Lexus LS400 (2000 year). Manual — part 69

N13043

ODO/TRIP

RESET

N21986

Ignition
Switch

Fuel
Gauge

Battery

N21987

Ignition
Switch

Fuel
Gauge

Battery

I03468

A

B

C

D

BE–104

–

BODY ELECTRICAL

COMBINATION METER

1967

9.

INSPECT TWIN TRIP AND ODO SWITCH CONTINUITY

Switch position

Tester connection

Condition

ODO/TRIP Free

1 – 2

No continuity

ODO/TRIP Pushed in

1 – 2

Continuity

RESET Free

2 – 3

No continuity

RESET Pushed in

2 – 3

Continuity

If continuity is not as specified, replace the twin trip and odo
switch.

10.

INSPECT FUEL RECEIVER GAUGE OPERATION

(a)

Disconnect the connector from the sender gauge.

(b)

Turn the ignition switch ON, check that the receiver gauge
needle indicates EMPTY.

(c)

Connect the terminals 3 and 2 on the wire harness side
connector.

(d)

Turn the ignition switch ON and check that the receiver
gauge needle moves toward the full side.

HINT:
Because of the silicon oil in the gauge, it will take a short time
for the needle to stabilize.
NOTICE:
Do not connect the terminals 1 and 3.
If operation is not as specified, inspect the power source unit.
11.

INSPECT FUEL RECEIVER GAUGE RESISTANCE

Measure the resistance between terminals.

Between terminals

Resistance (

Ω

)

A – B

Approx. 151.8

C – D

Approx. 164.2

If resistance value is not as specified, replace the fuel receiver
gauge.

I03498

5V

1/2

F

*1

E

1

2

3

I03493

Battery

Ignition
Switch

Multi Display

N06641

Z06815

Engine Coolant Temperature Gauge

Ignition
Switch

Test Bulb
(3.4W)

Battery

–

BODY ELECTRICAL

COMBINATION METER

BE–105

1968

12.

INSPECT FUEL SENDER GAUGE VOLTAGE

Measure the voltage between terminals 1 and 2 for each float
position.
*1: Set value 270.7 mm (10.66 in.)

Float position mm (in.)

Voltage (V)

F

Approx. 310.5 (12.22)

Approx. 4.6

1/2

Approx. 172.0 (6.77)

Approx. 2.43

E

Approx. 34.3 (1.35)

Approx. 0.35

If resistance value is not as specified, replace the sender
gauge.

13.

INSPECT BRAKE PAD SENSOR
(Front side: See page

BR–23

)

(Rear side: See page

BR–33

)

14.

INSPECT BRAKE PAD INDICATOR LIGHT

(a)

Disconnect the connector from the brake pad sensor.

(b)

Turn the ignition switch ON, check that the indicator light
lights up.

If the indicator light does not light up, test the bulb or inspect
wire harness.

15.

INSPECT ENGINE COOLANT TEMPERATURE RE-
CEIVER GAUGE OPERATION

(a)

Disconnect the connector from the sender gauge.

(b)

Turn the ignition switch ON and check that the receiver
gauge needle indicates COOL.

(c)

Ground terminal on the wire harness side connector
through a 3.4 W test bulb.

(d)

Turn the ignition switch ON and check that the bulb lights
up and the receiver gauge needle moves toward the hot
side.

(e)

Then recheck the system.

If operation is not as specified, measure the receiver gauge re-
sistance.

I03467

C

D

B

A

I01258

N06640

I03494

Multi Display

Ignition
Switch

Battery

BE–106

–

BODY ELECTRICAL

COMBINATION METER

1969

16.

INSPECT ENGINE COOLANT TEMPERATURE RE-
CEIVER GAUGE RESISTANCE

Measure the resistance between terminals.
HINT:
Connect the test leads so the current from the ohmmeter can
flow according to the chart order.

Between terminals

Resistance (

Ω

)

A – B

Approx. 151.8

C – D

Approx. 164.2

If resistance value is not as specified, replace the engine cool-
ant temperature receiver gauge.

17.

INSPECT ENGINE COOLANT TEMPERATURE SEND-
ER GAUGE RESISTANCE

Measure the resistance between the terminal and gauge body.

Temperature

°

C(

°

F)

Resistance (

Ω

)

50 (122.0)

160 – 240

120 (248.0)

17.1 – 21.2

If resistance value is not as specified, replace the engine cool-
ant temperature sender gauge.

18.

INSPECT LOW OIL PRESSURE WARNING SWITCH

(a)

Check that there is continuity between terminal and
ground with the engine stopped.

(b)

Check that there is no continuity between terminal and
ground with the engine running.

HINT:
Oil pressure should be over 24.5 kPa (0.25 kgf/cm, 3.6 psi).
If operation is not as specified, replace the switch.

19.

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 or inspect the
wire harness.

N06783

N13007

w/ TRAC

OFF

ON

Z08768

OFF

ON

BE1217

Warning Light

Ignition
Switch

Battery

I03495

Multi Display

Ignition
Switch

Battery

–

BODY ELECTRICAL

COMBINATION METER

BE–107

1970

20.

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

(a)

Disconnect the connector.

(b)

Check that there is no continuity between terminals with
the switch OFF (float up).

(c)

Use syphon, etc. to take fluid out of the reservoir tank.

(d)

Check that there is continuity between terminals with the
switch ON (float down).

(e)

Pour the fluid back in reservoir tank.

If operation is not as specified, replace the reservoir tank.

21.

INSPECT PARKING BRAKE SWITCH

(a)

Check that there is continuity between terminal and
switch body with the switch ON (switch pin released).

(b)

Check that there is no continuity between terminal and
switch body with the switch OFF (switch pin pushed in).

If continuity is not as specified, replace the switch or inspect
ground point.

22.

INSPECT BRAKE WARNING LIGHT

(a)

Disconnect the connector from the brake fluid warning
switch.

(b)

Release the parking brake pedal.

(c)

Connect terminals on the wire harness side of the level
warning switch connector.

(d)

Start the engine and check that the warning light lights up.

If the warning light does not light up, test the bulb.

23.

INSPECT LIGHT FAILURE SENSOR
(See page

BE–76

)

24.

INSPECT REAR LIGHT WARNING LIGHT

(a)

Disconnect the connector from the light failure sensor and
ground terminal 4 on the wire harness side connector.

(b)

Start the engine and check that the warning light lights up.

If the warning light does not light up, test the bulb or inspect wire
harness.