Lexus LS400 (2000 year). Manual - part 23

Z14969

2

1

–

+

2

1

–

+

(a)

(b)

Z14970

2

1

Z07887

N07798

2

1

–

+

BE–174

–

BODY ELECTRICAL

POWER SEAT CONTROL SYSTEM (w/o Driving 
Position Memory)

2037

7.

INSPECT FRONT VERTICAL MOTOR OPERATION

(a)

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

(b)

Reverse the polarity and check that the motor turns coun-
terclockwise.

If operation is not as specified, replace the motor.

8.

Driver’s Seat:
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 battery negative (–) terminal, then
move the front edge of seat cushion to the highest posi-
tion.

(b)

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

(c)

Disconnect the leads from terminals.

(d)

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

If operation is not as specified, replace the motor.

9.

INSPECT REAR VERTICAL MOTOR OPERATION

(a)

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

(b)

Reverse the polarity, and check that the motor turns coun-
terclockwise.

If operation is not as specified, replace the motor.

Z14971

2

1

–

+

Z07469

2

1

–

+

Z14969

2

1

–

+

2

1

–

+

(a)

(b)

Z14973

2

1

–

+

–
+

–

BODY ELECTRICAL

POWER SEAT CONTROL SYSTEM (w/o Driving 
Position Memory)

BE–175

2038

10.

Driver’s seat:
INSPECT REAR VERTICAL MOTOR PTC THERM-
ISTOR OPERATION

(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 battery negative (–) terminal, then
move the rear edge of seat cushion to the highest posi-
tion.

(b)

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

(c)

Disconnect the leads from terminals.

(d)

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

If operation is not as specified, replace the motor.

11.

Driver’s Seat:
INSPECT RECLINING MOTOR OPERATION

(a)

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

(b)

Reverse the polarity, and check that the motor turns
clockwise.

If operation is not as specified, replace the motor.

12.

Driver’s Seat:
INSPECT RECLINING MOTOR PTC THERMISTOR OP-
ERATION

(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 battery negative (–)  terminal, then
recline the seat back to the most forward position.

(b)

Continue to apply voltage, and check that the current
change to less than 1 ampere with 4 to 90 seconds.

Z07474

2

1

–

+

N21675

2

1

N21676

2

1

N13487

2

1

N13488

2

1

BE–176

–

BODY ELECTRICAL

POWER SEAT CONTROL SYSTEM (w/o Driving 
Position Memory)

2039

(c)

Disconnect the lead from terminals.

(d)

Approximately 60 seconds later, connect the positive (+)
lead from battery to terminal 2 and the negative (–) lead
to terminal 1, check that the seat back starts to fall back-
wards.

If operation is not as specified, replace the motor.

13.

INSPECT LUMBAR SUPPORT MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
1 and the negative (–) lead to terminal 2, and check that
the lumbar support moves release side.

(b)

Reverse the polarity, and check that the lumbar support
moves forward.

If operation is not as specified, replace the motor.

14.

Driver’s Seat:
INSPECT LUMBAR SUPPORT 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 battery negative (–) terminal, then
move the front edge of seat cushion to the highest posi-
tion.

(b)

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

(c)

Disconnect the leads from terminals.

(d)

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

If operation is not as specified, replace the motor.

I09308

UP

FRONT

REAR

DOWN

REAR

FRONT

Connector ”A”

Connector ”B”

–

BODY ELECTRICAL

POWER SEAT CONTROL SYSTEM (w/o Driving 
Position Memory)

BE–177

2040

15.

Taiwan Models Only:
INSPECT REAR POWER SEAT SWITCH CONTINUITY

Slide switch LH:

Switch position

Tester connection

Specified condition

FRONT

B1 – B5

B5 – B7

Continuity

OFF

B1 – B7

B5 – B7

Continuity

REAR

B1 – B7

B5 – B6

Continuity

Slide switch RH:

Switch position

Tester connection

Specified condition

FRONT

B4 – B6

B9 – B7

Continuity

OFF

B4 – B7

B7 – B10

Continuity

REAR

B4 – B7

B7 – B10

Continuity

Headrest switch LH (for vertical):

Switch position

Tester connection

Specified condition

UP

B2 – B6

B7 – B8

Continuity

OFF

B2 – B7

B7 – B8

Continuity

DOWN

B2 – B7

B6 – B8

Continuity

Headrest switch RH (for vertical):

Switch position

Tester connection

Specified condition

UP

B3 – B6

B7 – B9

Continuity

OFF

B3 – B7

B7 – B9

Continuity

DOWN

B3 – B7

B6 – B9

Continuity

Headrest switch LH (for turning)

Switch position

Tester connection

Specified condition

FRONT

A4 –B7

Continuity

OFF

–

No continuity

REAR

A5 –B7

Continuity

Headrest switch RH (for turning)

Switch position

Tester connection

Specified condition

FRONT

A4 –B7

Continuity

OFF

–

No continuity

REAR

A5 –B7

Continuity

If continuity is not as specified, replace the switch.