LEXUS LS430 2003 Factory Repair Manual

Fig. 43: Identifying Power Seat Cushion Switch Connector Terminals -Driver Seat
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
6.Passenger's seat:
INSPECT POWER SEAT SWITCH SUB
a. Measure the resistance between the terminals when the switch is operated.
Standard:
Reclining switch
TESTER CONNECTION AND SPECIFIED CONDITION
Slide switch
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the switch.
Tester ConnectionSwitch ConditionSpecified Condition
5 (MRF) - 10 (B)FRONTBelow 1 ohms
6 (MRR) - 10 (B)FRONTBelow 1 ohms
5 (MRF) - 7 (RCLF)OFFBelow 1 ohms
2 (RCLR) - 6 (MRR)OFFBelow 1 ohms
6 (MRR) - 10 (B)REARBelow 1 ohms
5 (MRF) - 7 (RCLF)REARBelow 1 ohms
Tester ConnectionSwitch ConditionSpecified Condition
4 (MSF) - 10 (B)FRONTBelow 1 ohms
3 (SLDR) - 9 (MSR)FRONTBelow 1 ohms
4 (MSF) - 8 (SLDF)OFFBelow 1 ohms
3 (SLDR) - 9 (MSR)OFFBelow 1 ohms
9 (MSR) - 10 (B)REARBelow 1 ohms
4 (MSF) - 8 (SLDF)REARBelow 1 ohms

Fig. 44: Identifying Power Seat Cushion Switch Connector Terminals - Passenger Seat
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
7.INSPECT POWER SEAT MOTOR
a. Check operation of the slide motor.
1. Check if the motor rotates smoothly when the battery is connected to the slide motor
connector terminals.
OK:
MEASUREMENT CONDITION AND SPECIFIED CONDITION
If the result is not as specified, replace the slide motor.
Measurement ConditionSpecified Condition
Battery positive (+) --> 1 Battery negative (-) --> 2Counterclockwise
Battery positive (+) --> 2 Battery negative (-) --> 1Clockwise

Fig. 45: Checking Operation Of Slide Motor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Check operation of the vertical motor.
1. Check if the motor rotates smoothly when the battery is connected to the vertical motor
connector terminals.
OK:
MEASUREMENT CONDITION AND SPECIFIED CONDITION
Measurement ConditionSpecified Condition
Battery positive (+) --> 1 Battery negative (-) --> 2Counterclockwise

If the result is not as specified, replace the vertical motor.
Fig. 46: Checking Operation Of Vertical Motor

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c. Check operation of the lifter motor.
1. Check if the motor rotates smoothly when the battery is connected to the lifter motor
connector terminals.
OK:
MEASUREMENT CONDITION AND SPECIFIED CONDITION
Battery positive (+) --> 2 Battery negative (-) --> 1Clockwise
Measurement ConditionSpecified Condition

If the result is not as specified, replace the lifter motor.
Fig. 47: Checking Operation Of Lifter Motor

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
d. Check operation of the reclining motor.
1. Check if the motor rotates smoothly when the battery is connected to the reclining motor
connector terminals.
OK:
MEASUREMENT CONDITION AND SPECIFIED CONDITION
Battery positive (+) --> 1 Battery negative (-) --> 2Counterclockwise
Battery positive (+) --> 2 Battery negative (-) --> 1Clockwise

If the result is not as specified, replace the reclining motor.
Fig. 48: Checking Operation Of Reclining Motor

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
e. Check operation of the cushion slide motor.
1. Check if the motor rotates smoothly when the battery is connected to the cushion slide motor
connector terminals.
Measurement ConditionSpecified Condition
Battery positive (+) --> 1 Battery negative (-) --> 2Counterclockwise
Battery positive (+) --> 2 Battery negative (-) --> 1Clockwise

OK:
MEASUREMENT CONDITION AND SPECIFIED CONDITION
If the result is not as specified, replace the cushion slide motor.
Fig. 49: Checking Operation Of Cushion Slide Motor

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
8.INSPECT POWER SEAT MOTOR (LUMBAR SUPPORT)
a. Check operation of the lumbar support adjuster motor.
1. Check if the motor rotates smoothl
y when the battery is connected to the lumbar support
Measurement ConditionSpecified Condition
Battery positive (+) --> 1 Battery negative (-) --> 2Counterclockwise
Battery positive (+) --> 2 Battery negative (-) --> 1Clockwise

adjuster motor connector terminals.
OK:
MEASUREMENT CONDITION AND SPECIFIED CONDITION
If the result is not as specified, replace the adjuster motor.
Fig. 50: Checking Operation Of Lumbar Support Adjuster Motor

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
9.INSPECT POWER SEAT MOTOR (HEADREST)
a. Check operation of the headrest motor.
1. Check if the motor rotates smoothly when the battery is connected to the headrest motor
connector terminals.
Measurement ConditionSpecified Condition
Battery positive (+) --> 1 Battery negative (-) --> 2Clockwise
Battery positive (+) --> 2 Battery negative (-) --> 1Counterclockwise

OK:
MEASUREMENT CONDITION AND SPECIFIED CONDITION
If the result is not as specified, replace the headrest motor.
Measurement ConditionSpecified Condition
Battery positive (+) --> 5 (DOWN) Battery negative (-) --> 1 (UP)Clockwise
Battery positive (+) --> 1 (UP) Battery negative (-) --> 5 (DOWN)Counterclockwise