Lexus ES300 (1997 year). Manual — part 266

Z19486

Engine Room Junction Block

ECU–B Fuse

Instrument Panel Junction Block

STOP Fuse

GAUGE Fuse

ECU–IG Fuse

Reclining Motor

Power Seat Switch

Rear Vertical Motor

Slide Motor

Rear Vertical Motor

Power Seat Switch

Front Vertical Motor

BE05S–01

BE–128

–

BODY ELECTRICAL

POWER SEAT CONTROL SYSTEM

1512

1997 LEXUS ES300 (RM511U)

POWER SEAT CONTROL SYSTEM

LOCATION

BE05T–03

I01913

Rear Vertical

Up

Down

Reclining

1

Front Vertical

Up

Down

Front

Back

2

3

4

5

6

7

8

9

10

11

12

Forward

Rear

I01913

Rear Vertical

Up

Down

Reclining

1

Front Vertical

Up

Down

Front

Back

2

3

4

5

6

7

8

9

10

11

12

Forward

Rear

–

BODY ELECTRICAL

POWER SEAT CONTROL SYSTEM

BE–129

1513

1997 LEXUS ES300 (RM511U)

INSPECTION

1.

INSPECT DRIVER’S POWER SEAT SWITCH CONTI-
NUITY

Slide Switch:

Switch position

Tester connection

Specified condition

FRONT

4 – 7 8 – 11

Continuity

OFF

4 – 7 – 8

Continuity

BACK

4 – 11 7 – 8

Continuity

Front vertical switch:

Switch position

Tester connection

Specified condition

UP

7 – 9 10 – 11

Continuity

OFF

7 – 9 – 10

Continuity

DOWN

7 – 10 9 – 11

Continuity

Rear vertical switch:

Switch position

Tester connection

Specified condition

UP

2 – 11 3 – 7

Continuity

OFF

2 – 3 – 7

Continuity

DOWN

2 – 7 3 – 11

Continuity

Reclining switch:

Switch position

Tester connection

Specified condition

FORWARD

1 – 11 5 – 7

Continuity

OFF

1 – 5 – 7

Continuity

REAR

1 – 7 5 – 11

Continuity

If continuity is not as specified, replace the switch.

2.

INSPECT PASSENGER’S POWER SEAT SWITCH
CONTINUITY

Slide switch:

Switch position

Tester connection

Specified condition

FRONT

4 – 7 8 – 11

Continuity

OFF

4 – 7 – 8

Continuity

BACK

4 – 11 7 – 8

Continuity

Front vertical switch:

Switch position

Tester connection

Specified condition

UP

7 – 10 9 – 11

Continuity

OFF

7 – 9 – 11

Continuity

DOWN

7 – 11 9 – 10

Continuity

Rear vertical switch:

Switch position

Tester connection

Specified condition

UP

2 – 7 3 – 11

Continuity

OFF

2 – 3 – 7

Continuity

DOWN

2 – 11 3 – 7

Continuity

Z09315

Wire Harness Side

1

2

3

4

5

6

7

8

9 10

11 12

13

14

15 16

eg–16–1

N21865

(a)

(b)

2

1

1

2

N21866

2

1

BE–130

–

BODY ELECTRICAL

POWER SEAT CONTROL SYSTEM

1514

1997 LEXUS ES300 (RM511U)

Reclining switch:

Switch position

Tester connection

Specified condition

FORWARD

1 – 11 5 – 7

Continuity

OFF

1 – 5 – 7

Continuity

REAR

1 – 7 5 – 11

Continuity

If continuity is not as specified, replace the switch.

3.

INSPECT POWER SEAT SWITCH CIRCUIT

(a)

Disconnect the switch connector and connect the seat
wire harness to the floor wire harness.

(b)

Inspect the connector on the wire harness side.

Tester connection

Condition

Specified condition

7 – Ground

Constant

Continuity

11 – Ground

Constant

Battery positive voltage

If circuit is not as specified, inspect the circuits connected to oth-
er parts.

4.

INSPECT SLIDE MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
1 and the negative (–) lead to terminal 2, check that the
motor turns counterclockwise.

(b)

Reverse the polarity, check that the motor turns clock-
wise.

If operation is not as specified, replace the seat adjuster.

5.

INSPECT SLIDE MOTOR PTC THERMISTOR OPERA-
TION

(a)

Connect the positive (+) lead from the battery to terminal
1, the positive (+) lead from the ammeter to terminal 2 and
the negative (–) lead to the battery negative (–) terminal,
then move the seat cushion to the front position.

(b)

Continue to apply voltage, check that current changes to
less than 1 ampere within 4 to 90 seconds.

N21867

2

1

N21865

(a)

(b)

2

1

1

2

N22086

2

1

N22087

2

1

N21865

(a)

1

(b)

2

2

1

–

BODY ELECTRICAL

POWER SEAT CONTROL SYSTEM

BE–131

1515

1997 LEXUS ES300 (RM511U)

(c)

Disconnect the leads from terminals.

(d)

Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 2 and the negative (–)
lead to terminal 1, check that the seat cushion begins to
move backwards.

If operation is not as specified, replace the seat adjuster.

6.

INSPECT FRONT VERTICAL MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
1 and the negative (–) lead to terminal 2, check that the
motor turns counterclockwise.

(b)

Reverse the polarity, check that the motor turns clock-
wise.

If operation is not as specified, replace the seat adjuster.

7.

INSPECT FRONT VERTICAL MOTOR PTC THERM-
ISTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
1, the positive (+) lead from the ammeter to terminal 2 and
the negative (–) lead to the battery negative (–) terminal,
then move the seat cushion to the highest position.

(b)

Continue to apply voltage, check that the current changes
to less than 1 ampere within 4 to 90 seconds.

(c)

Disconnect the leads from the terminals.

(d)

Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 2 and the negative (–)
lead to terminal 1, check that the seat cushion begins to
descend.

If operation is not as specified, replace the seat adjuster.

8.

INSPECT REAR VERTICAL MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
1 and the negative (–) lead to terminal 2, check that the
motor turns counterclockwise.

(b)

Reverse the polarity, check that the motor turns clock-
wise.

If operation is not as specified, replace the seat adjuster.