Lexus ES300 (1997 year). Manual — part 268

Z19373

Seat Heater Switch (R)

Ignition Switch

Seat Heater
(Seat Back)

Seat Heater Switch (L)

Instrument Panel Junction Block

SEAT–HEATER Fuse

PANEL Fuse

Taillight Relay

Seat Heater
(Seat Cushion)

BE05W–01

BE–136

–

BODY ELECTRICAL

SEAT HEATER SYSTEM

1520

1997 LEXUS ES300 (RM511U)

SEAT HEATER SYSTEM

LOCATION

BE05X–01

N21250

N21372

Z07440

Wire Harness Side

1

2

3 4 5 6

N21540

–

BODY ELECTRICAL

SEAT HEATER SYSTEM

BE–137

1521

1997 LEXUS ES300 (RM511U)

INSPECTION

1.

INSPECT SEAT HEATER SWITCH CONTINUITY

Condition

Tester connection

Specified condition

OFF

2 – 6

Continuity

ON

2 – 4 – 6

Continuity

Illumination circuit

1 – 3

Continuity

If continuity is not as specified, replace the switch or bulb.

2.

INSPECT SEAT HEATER SWITCH INDICATOR

(a)

Connect the positive (+) lead from the battery to terminal
4 and the negative (–) lead to terminal 2.

(b)

Push the switches, check that the indicator lights up.

If operation is not as specified, replace the switch and inspect
the circuits connected to other parts.

3.

INSPECT SEAT HEATER SWITCH CIRCUIT

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

Tester connection

Condition

Specified condition

2 – Ground

Constant

*

Continuity

6 – Ground

Constant

*

Continuity

4 – Ground

Ignition switch position LOCK or ACC

No voltage

4 – Ground

Ignition switch position ON

Battery positive voltage

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

4.

INSPECT SEAT CUSHION CONTINUITY

(a)

Heat the 2 thermostats with light. Check that there is no
continuity above 45

°

C (113

°

F) between terminals 1 and

2.

(b)

Cool the 2 thermostats below 15

°

C (59

°

F). Check that

there is continuity between terminals 1 and 2.

N21541

BE–138

–

BODY ELECTRICAL

SEAT HEATER SYSTEM

1522

1997 LEXUS ES300 (RM511U)

5.

INSPECT SEAT BACK CONTINUITY

Check that there is continuity between terminals 1 and 2.
If continuity is not as specified, replace the seat back pad.

Z19376

Fuel Lid Opener Switch

Instrument Panel Junction Block

DOOR Fuse

Fuel Lid Opener Solenoid

BE05Y–01

–

BODY ELECTRICAL

FUEL LID OPENER SYSTEM

BE–139

1523

1997 LEXUS ES300 (RM511U)

FUEL LID OPENER SYSTEM

LOCATION