Lexus ES300 (1997 year). Service manual — part 131

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.

N22088

2

1

N22089

2

1

N21865

(a)

(b)

2

1

1

2

N21868

2

1

N21869

2

1

BE–132

–

BODY ELECTRICAL

POWER SEAT CONTROL SYSTEM

1516

1997 LEXUS ES300 (RM511U)

9.

INSPECT REAR 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.

10.

INSPECT RECLINING 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.

11.

INSPECT RECLINING MOTOR PTC THERMISTOR OP-
ERATION

(a)

Connect the positive (+) lead from the battery to terminal
2, the positive (+) lead from the ammeter to terminal 1 and
the negative (–) lead to the battery negative (–) terminal,
then recline the seat back to the most forward 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 1 and the negative (–)
lead to terminal 2, check that the seat back starts to fall
backward.

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

N21494

LH Mirror

Mirror Motor

Mirror Switch

Ignition Switch

Instrument Panel Junction Block

CIG Fuse

RH Mirror

Mirror Motor

BE05U–01

–

BODY ELECTRICAL

POWER MIRROR CONTROL SYSTEM

BE–133

1517

1997 LEXUS ES300 (RM511U)

POWER MIRROR CONTROL SYSTEM

LOCATION