Lexus RX300 (MCU15). Manual — part 145
I05472
Wire Harness Side
I19116
Reclining
Front
Back
Forward
Rear
Lifter
Up
Down
Down
Front
Vertical
UP
–
BODY ELECTRICAL
POWER SEAT CONTROL SYSTEM
BE–127
LEXUS RX300 (RM785E)
2.
INSPECT DRIVER’S 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
4 – Ground
Constant
Continuity
1 – Ground
Constant
Battery positive voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.
3.
INSPECT PASSENGER’S (LHD)/DRIVER’S (RHD)
POWER SEAT SWITCH CONTINUITY
Slide switch:
Switch position
Tester connection
Specified condition
FRONT
1 – 9
4 – 6
Continuity
OFF
4 – 6
4 – 9
Continuity
BACK
1 – 6
4 – 9
Continuity
Front vertical switch:
Switch position
Tester connection
Specified condition
UP
1 – 5
4 – 10
Continuity
OFF
4 – 5
4 – 10
Continuity
DOWN
1 – 10
4 – 5
Continuity
Lifter switch:
Switch position
Tester connection
Specified condition
UP
1 – 8
4 – 7
Continuity
OFF
4 – 7
4 – 8
Continuity
DOWN
1 – 7
4 – 8
Continuity
I05472
Wire Harness Side
I04161
RELEASE
FORWARD
I04162
Wire Harness Side
BE–128
–
BODY ELECTRICAL
POWER SEAT CONTROL SYSTEM
LEXUS RX300 (RM785E)
Reclining switch:
Switch position
Tester connection
Specified condition
FORWARD
1 – 3
2 – 4
Continuity
OFF
2 – 4
3 – 4
Continuity
REAR
1 – 2
3 – 4
Continuity
If continuity is not as specified, replace the switch.
4.
INSPECT PASSENGER’S POWER SEAT SWITCH CIR-
CUIT
(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
4 – Ground
Constant
Continuity
1 – Ground
Constant
Battery positive voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.
5.
INSPECT LUMBAR SUPPORT SWITCH CONTINUITY
Switch position
Tester connection
Specified condition
FORWARD
1 – 4
2 – 3
Continuity
OFF
1 – 3
2 – 3
Continuity
RELEASE
1 – 3
2 – 4
Continuity
If continuity is not as specified, replace the switch.
6.
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.
N21865
(a)
(b)
2
1
1
2
N21866
2
1
N21867
2
1
N21865
(a)
(b)
2
1
1
2
–
BODY ELECTRICAL
POWER SEAT CONTROL SYSTEM
BE–129
LEXUS RX300 (RM785E)
Tester connection
Condition
Specified condition
3 – Ground
Constant
Continuity
4 – Ground
Constant
Battery positive voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.
7.
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.
8.
INSPECT SLIDE MOTOR PTC THERMISTOR OPERA-
TION
( ): Passenger side
(a)
Connect the positive (+) lead from the battery to terminal
1 (2), the positive (+) lead from the ammeter to terminal
2 (1) 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.
(c)
Disconnect the leads from terminals.
(d)
Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 2 (1) and the negative (–)
lead to terminal 1 (2), check that the seat cushion begins
to move backwards.
If operation is not as specified, replace the seat adjuster.
9.
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.
N22086
2
1
N22087
2
1
N21865
(a)
1
(b)
2
2
1
N22088
2
1
N22089
2
1
BE–130
–
BODY ELECTRICAL
POWER SEAT CONTROL SYSTEM
LEXUS RX300 (RM785E)
10.
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.
11.
INSPECT LIFTER 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.
12.
INSPECT LIFTER 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 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 1 and the negative (–)
lead to terminal 2, check that the seat cushion begins to
descend.
If operation is not as specified, replace the seat adjuster.
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