Lexus LS400 (2000 year). Manual — part 70

N13041

Warning Light

Ignition
Switch

Battery

N13040

OFF

ON

I03496

Multi Display

Ignition
Switch

Battery

N21989

Ohmmeter

Below 50

°

C

(122

°

F)

UP

Down

N06341

Above 60

°

C

(140

°

F)

ON

OFF

BE–108

–

BODY ELECTRICAL

COMBINATION METER

1971

25.

INSPECT COURTESY SWITCH
(See page

BE–70

)

26.

INSPECT OPEN DOOR WARNING LIGHT

(a)

Disconnect the connector from the door lock assembly
and ground terminal 3 on the wire harness side connec-
tor, and check that the warning light lights up.

If the warning light does not light up, inspect the bulb or wire har-
ness or body ECU.

27.

INSPECT WASHER LEVEL WARNING SWITCH CON-
TINUITY

(a)

Remove the washer tank.

(b)

Check that there is continuity between terminals (float
down).

(c)

Check that there is no continuity between terminals (float
up).

If continuity is not as specified, replace the switch.

28.

INSPECT WASHER LEVEL WARNING LIGHT

(a)

Disconnect the connector from the washer level warning
switch and ground terminal 2 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.

29.

INSPECT ENGINE OIL LEVEL WARNING SWITCH
CONTINUITY

(a)

Check that there is continuity exists between terminals
when the sensor–sensed temperature drops to 40

°

C or

less with the float down.

(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.

Z08774

Wire Harness Side

I03493

Multi Display

Ignition
Switch

Battery

I03437

ON

OFF

4

1

Z08777

Wire Harness Side

–

BODY ELECTRICAL

COMBINATION METER

BE–109

1972

30.

INSPECT ENGINE OIL LEVEL WARNING SWITCH CIR-
CUIT

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.

31.

INSPECT ENGINE OIL LEVEL WARNING LIGHT

(a)

Disconnect the connector from the switch.

(b)

Turn the ignition switch ON. Check that the warning light
lights up approximately 40 seconds later.

If the warning light does not light up, inspect the bulb or wire har-
ness.

32.

INSPECT BUCKLE SWITCH CONTINUITY

(a)

Check that there is continuity between terminal 1 and 4
on the switch side connector with the switch ON (belt fas-
tened).

(b)

Check that there is no continuity between terminal 1 and
4 on the switch side connector with the switch OFF (belt
unfastened).

If operation is not as specified, replace the seat belt inner.

33.

INSPECT SEAT BELT WARNING SWITCH CIRCUIT

Disconnect the connector from the switch and inspect the con-
nector on wire harness side, as shown.

Tester connection

Condition

Specified condition

–

Turn the ignition switch ON

Chime sounds for 4 – 8 sec.

–

Ground terminal 2 and turn the ignition switch ON

No chime sound

1 – Ground

Constant

Continuity

If the circuit is not as specified, inspect the circuits connected
to other parts.

I03246

1 2 3

I03267

Sensing Part

A

B

B

A

Pressing

Pressing

BE–110

–

BODY ELECTRICAL

COMBINATION METER

1973

34.

INSPECT MULTI–INFORMATION DISPLAY SWITCH

Measure the resistance between terminals 2 and 3.

Switch position

Resistance (

Ω

)

FUNCTION

0

RESET

Approx. 360

MODE

Approx. 1,110

If resistance value is not as specified, replace the switch.
35.

INSPECT MULTI–INFORMATION DISPLAY SWITCH
CIRCUIT (See page

BE–86

)

36.

INSPECT SEAT BELT WARNING OCCUPANT DETEC-
TION SENSOR

Check that continuity exists between terminal 1 and 2 when
pressing the sensing part.

EC03T–01

–

EMISSION CONTROL

EMISSION CONTROL SYSTEM

EC–1

1303

EMISSION CONTROL SYSTEM

PURPOSE

The emission control systems are installed to reduce the amount of HC, CO and NOx exhausted from the
engine ((3) and (4)), to prevent the atmospheric release of blow–by gas–containing HC (1) and evaporated
fuel containing HC being released from the fuel tank (2).
The function of each system is shown in the following table:

System

Abbreviation

Function

(1) Positive Crankcase Ventilation

(2) Evaporative Emission Control

(3) Three–Way Catalytic Converter

(4) Sequential Multiport Fuel Injection*

PCV

EVAP

TWC

SFI

Reduces HC

Reduces evaporated HC

Reduces HC, CO and NOx

Injects a precisely timed, optimum amount of fuel for reduced exhaust

emissions

Remark: * For inspection and repair of the SFI system, refer to the SF section in this manual.