Lexus LS400 (2000 year). Manual — part 22
I09274
Headrest Motor LH
(for turning)
Rear Power Seat Switch
Headrest Motor RH
(for turning)
Headrest Motor RH
(for vertical)
Headrest Motor LH
(for vertical)
Slide Motor LH
Slide Motor RH
TAIWAN models:
BE–170
–
BODY ELECTRICAL
POWER SEAT CONTROL SYSTEM (w/o Driving
Position Memory)
2033
Z16936
Front vertical
Rear vertical
DOWN
UP
BACK
FRONT
Slide
UP
DOWN
BE121–01
Z16937
Reclining
Head Rest
FORWARD
DOWN
UP REAR
–
BODY ELECTRICAL
POWER SEAT CONTROL SYSTEM (w/o Driving
Position Memory)
BE–171
2034
INSPECTION
1.
INSPECT FRONT POWER SEAT SWITCH CONTINU-
ITY
Slide switch
Switch position
Tester connection
Specified condition
FRONT
11 – 14
12 – 13
Continuity
OFF
11 – 13
12 – 13
Continuity
BACK
11 – 13
12 – 14
Continuity
Front vertical switch
Switch position
Tester connection
Specified condition
UP
9 – 14
10 – 13
Continuity
OFF
9 – 13
10 – 13
Continuity
DOWN
9 – 13
10 – 14
Continuity
Rear vertical switch
Switch position
Tester connection
Specified condition
UP
5 – 14
6 – 13
Continuity
OFF
5 – 13
6 – 13
Continuity
DOWN
5 – 13
6 – 14
Continuity
Reclining switch
Switch position
Tester connection
Specified condition
FORWARD
4 – 14
3 – 13
Continuity
OFF
4 – 13
3 – 13
Continuity
REAR
4 – 13
3 – 14
Continuity
Headrest switch
Switch position
Tester connection
Specified condition
UP
14 – 15
13 – 16
Continuity
OFF
13 – 15
13 – 16
Continuity
DOWN
13 – 15
14 – 16
Continuity
If continuity is not as specified, replace the switch.
Z09315
Wire Harness Side
1
5
11
7
13
2
6
12
8
14
4
10
16
3
9
15
Z07464
FORWARD
RELEASE
BE–172
–
BODY ELECTRICAL
POWER SEAT CONTROL SYSTEM (w/o Driving
Position Memory)
2035
2.
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, as
shown.
Tester connection
Condition
Specified condition
13 – Ground
Constant
Continuity
14 – Ground
Constant
Battery positive voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.
3.
INSPECT LUMBAR SUPPORT SWITCH CONTINUITY
( ): Passenger’s Seat
Switch position
Tester connection
Specified condition
FORWARD
1(1) – 4(4)
2(2) – 3(3)
Continuity
OFF
1(2) – 3(3)
2(2) – 3(4)
Continuity
RELEASE
1(1) – 3(3)
2(2) – 4(4)
Continuity
If continuity is not as specified, replace the switch.
Z06678
Wire Harness Side
N07798
2
1
–
+
Z14972
2
1
–
+
–
+
Z07885
2
1
–
+
–
BODY ELECTRICAL
POWER SEAT CONTROL SYSTEM (w/o Driving
Position Memory)
BE–173
2036
4.
INSPECT LUMBAR SUPPORT 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, as
shown.
( ): Passenger’s Seat
Tester connection
Condition
Specified condition
3 – Ground (2 – Ground)
Constant
Continuity
4 – Ground (1 – Ground)
Constant
Battery positive voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.
5.
INSPECT SLIDE 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 clock-
wise.
If operation is not as specified, replace the motor.
6.
Driver’s seat:
INSPECT SLIDE MOTOR PTC THERMISTOR OPERA-
TION
(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 seat to front position.
(b)
Continue to apply voltage and check that the current
changes to less than 1 ampere with 4 to 90 seconds.
(c)
Disconnect the lead 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 begins to move back-
wards.
If operation is not as specified, replace the motor.
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