2003 LEXUS LS430 Factory Repair Manual

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Page 3969 of 4500

LEXUS LS430 2003 Factory Repair Manual (SLIDING, FRONT VERTICAL, LIFTER, RECLINING, CUSHION SLIDING AND
HEADREST)
a. Check the PTC operation inside the power seat motor.
HINT:
The PTC thermistor's resistance increases when the po

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LEXUS LS430 2003 Factory Repair Manual 3. After the current has stopped, release the lumbar support switch and wait for approximately
60 seconds.
4. Operate the lumbar support switch and move the seat to the opposite extreme of directio

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LEXUS LS430 2003 Factory Repair Manual signaling that the seat position has been recorded.
3. Change the position of the seat and then press the M2 switch. Check that the buzzer sounds
for 0.1 seconds and the seat automatically moves to

signaling that the seat position has been recorded.
3. Change the position of the seat and then press the M2 switch. Check that the buzzer sounds
for 0.1 seconds and the seat automatically moves to the position in step (c)-(1).
d. Check the M3 switch.
1. Using the seat switches, fully slide the seat rearward, fully recline the seatback rearward and
fully lower the seat cushion and headrest.
2. Press and hold down switches M3 and SET. Check that the buzzer sounds for 0.5 seconds,
signaling that the seat position has been recorded.
3. Change the position of the seat and then press the M3 switch. Check that the buzzer sounds
for 0.1 seconds and the seat automatically moves to the position in step (d)-(1).
e. Check that the switches M1, M2 and M3 cause the seat to move to the recorded seat positions
under these conditions: turn the ignition switch to the LOCK position, remove the key from the key
cylinder, open the driver side door and press M1, M2 or M3 within 30 seconds.
f. Check that the following procedures will erase the recorded seat positions of switches M1, M2 and
M3: press and hold the power seat slide switch, disconnect the battery's negative terminal cable,
and wait for at least 1 minute.
g. Restore the seat's memory.
1. Using the seat switches, fully slide the seat forward, fully recline the seatback forward, and
fully raise the seat cushion and headrest.
2. Using the seat switches, fully slide the seat rearward, fully recline the seatback rearward and
fully lower the seat cushion and headrest.
HINT:
This will restore the seat's memory of the seat's maximum positions. However, it will not restore
any recorded seat positions to switches M1, M2 or M3.
h. Attempt to record a seat position by pressing and holding the SET switch and two other switches
<000b0044005000520051004a000300300014000f0003003000150003004400510047000300300016000c0011000300310052000300560048004400570003005300520056004c0057004c0052005100030056004b00520058004f0047000300450048000300
550048004600520055004700480047001100030026004b0048[ck this by pressing M1, M2 or
M3 and making sure that the seat does not move.
HINT:
This step will only be true if step (f) was performed properly, whereby all previously recorded set
positions were erased.
1.Passenger's seat:
INSPECT POWER SEAT SWITCH
a. Measure the resistance between the terminals when each switch is operated.
Standard:

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LEXUS LS430 2003 Factory Repair Manual Slide switch
TESTER CONNECTION AND SPECIFIED CONDITION
Front vertical switch
TESTER CONNECTION AND SPECIFIED CONDITION
Lifter switch
TESTER CONNECTION AND SPECIFIED CONDITION
Reclining switch

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LEXUS LS430 2003 Factory Repair Manual 1 (B) - 11 (RCLR)REARBelow 1 ohms

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LEXUS LS430 2003 Factory Repair Manual Fig. 39: Inspecting Power Seat Switch
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Headrest switch
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the switch.

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LEXUS LS430 2003 Factory Repair Manual Fig. 40: Identifying Driving Position Memory Switch Connector Terminals

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