Lexus ES300 (1997 year). Manual — part 123

N15887

+

–

Z14205

Ignition
Switch

Battery

Warning Light

BE0044 le–1–1–G

1

N06640

BE1217

Warning Light

Ignition
Switch

Battery

N02346

OFF

ON

1

2

BE–98

–

BODY ELECTRICAL

COMBINATION METER

1482

1997 LEXUS ES300 (RM511U)

13.

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.

14.

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.

15.

INSPECT LOW OIL PRESSURE SWITCH

(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.

16.

INSPECT BRAKE SYSTEM 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.

17.

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

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

(e)

Check that continuity exists between the terminals with
the switch ON (float down)

Z14206

Pedal,Stick TYPE

ON

OFF

1

BE1217

Warning Light

Ignition
Switch

Battery

N20217

Ohmmeter

OFF

ON

Z10258

Wire Harness Side

1 2

Z05732

Warning Light

Ignition
Switch

Battery

1

–

BODY ELECTRICAL

COMBINATION METER

BE–99

1483

1997 LEXUS ES300 (RM511U)

(f)

Pour the fluid back in the reservoir tank.

If operation is not as specified, replace the switch.
18.

INSPECT PARKING BRAKE SWITCH

(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.

19.

INSPECT WASHER LEVEL WARNING LIGHT

(a)

Disconnect the connectors from the level warning switch
and parking brake switch.

(b)

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

(c)

Remove the GAUGE fuse and turn the ignition switch ON,
and check that the warning light comes on.

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

20.

INSPECT WASHER LEVEL WARNING SWITCH

(a)

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

(b)

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

If operation is not as specified, replace the switch.

21.

INSPECT WINDOW WASHER LEVEL WARNING
SWITCH CIRCUIT

Disconnect the switch connector and inspect the connector on
wire harness side.

Tester connection

Condition

Specified condition

2 – Ground

Constant

Continuity

If continuity is not as specified, inspect the wire harness or
ground point.

22.

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.

Z15790

Warning Light

Wire Harness Side

Ignition
Switch

Battery

5

7

9 10 11 12

4

6

8

2 3

1

Z07425

Wire Harness Side

1 2 3

4 5

6 7 8 9 10 11 12

BE0044

Warning Light

Ignition
Switch

Battery

BE–100

–

BODY ELECTRICAL

COMBINATION METER

1484

1997 LEXUS ES300 (RM511U)

23.

INSPECT 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, check that the warning light lights up.

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

24.

INSPECT LIGHT FAILURE SENSOR CIRCUIT

Disconnect the connector from the sensor and inspect the con-
nector on the wire harness side.

Tester connection

Condition

Specified condition

1 – Ground

Constant

Continuity*

2 – Ground

Constant

Continuity*

9 – Ground

Constant

Continuity*

10 – Ground

Constant

Continuity*

11 – Ground

Constant

Continuity*

12 – Ground

Constant

Continuity*

3 – Ground

Light control switch OFF

No voltage

3 – Ground

Light control switch TAIL or HEAD

Battery positive voltage

4.8 – Ground

Ignition switch LOCK or ACC

No voltage

4.8 – Ground

Ignition switch ON

Battery positive voltage

7 – Ground

Stop light switch OFF

No voltage

7 – Ground

Stop light switch ON

Battery positive voltage

*: There is resistance because this circuit is grounded through
the bulb.
If the circuit is as specified, replace the sensor. If the circuit is
not as specified, inspect the circuits connected to other parts.

25.

INSPECT SEAT BELT WARNING LIGHT

(a)

Remove the integration relay from the instrument panel
junction block.

(b)

Ground terminal 2 on the integration relay with the con-
nectors still connected.

(c)

Turn the ignition switch ON and check that the warning
light lights up.

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

N19262

ON

1

2

OFF

N21309

Wire Harness Side

1 2

h–2–1–A

N21311

10

9

7

1

–

BODY ELECTRICAL

COMBINATION METER

BE–101

1485

1997 LEXUS ES300 (RM511U)

26.

INSPECT BUCKLE SWITCH CONTINUITY

(a)

Check that continuity exists between terminals 1 and 2 on
the switch side connector with the switch ON (belt fas-
tened).

(b)

Check that no continuity exists between terminals 1 and
2 on the switch side connector with the switch OFF (belt
unfastened).

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

27.

INSPECT BUCKLE SWITCH CIRCUIT

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

Tester connection

Condition

Specified condition

2 – Ground

Constant

Continuity

–

Turn the ignition switch ON

Chime sounds for 4 – 8 sec.

–

Ground terminal 1 and turn the ignition switch ON

No chime sound

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

28.

INSPECT INTEGRATION RELAY SEAT BELT WARN-
ING SYSTEM OPERATION

(a)

Connect the positive (+) lead from the battery to terminals
1 and 7.

(b)

Connect the terminal 7 to terminal 9 through the 3.4 W test
bulb.

(c)

Connect the negative (–) lead from the battery to terminal
10.

(d)

Check that the bulb lights and the buzzer sounds for 4 to
8 seconds.

(e)

Return to step (a) and operate the chime again.