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Home >> Lexus >> 2007 >> LS 460 V8-4.6L (1UR-FSE) >> Repair and Diagnosis >> Body and Frame >> Seats >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> Front Power Seat Control System >> Operation Check

Operation Check

OPERATION CHECK

1. CHECK FRONT POWER SEAT FUNCTION





a. Check the basic functions.
1. Operate the power seat switches and check to make sure each seat function works:
- Sliding
- Front vertical
- Lifter
- Reclining
- Lumbar support (up - down) (for Driver Seat)
- Lumbar support (forward - back)
- Cushion sliding (for Driver Seat)
- Headrest

2. CHECK POWER SEAT MOTOR ASSEMBLY (SLIDING, FRONT VERTICAL, LIFTER, RECLINING, LUMBAR SUPPORT, CUSHION SLIDING AND HEADREST)
a. Check the PTC operation inside the power seat motor.

HINT: The PTC thermistor's resistance increases when the power seat switch is held down even after the power seat has been moved to the maximum in one direction. If the resistance increases beyond a specified level, current is cut to prevent a short circuit.

NOTICE:
- The inspection should be performed with the seat installed in the vehicle.
- Perform the 4 steps below for each power seat function.
1. Choose a power seat function. Operate the power seat switch and move the seat as much as possible in one direction. Keep the seat in that position for approximately 60 seconds.
2. Operate the power seat switch again and continue to try to move the seat in the same direction as in the previous step. Measure the amount of time elapsed before current is automatically cut (the sound of the motor has stopped).

Standard: 4 to 90 seconds

3. After current has been cut, release the power seat switch and wait for approximately 60 seconds.
4. Operate the same power seat switch and move the seat in the opposite direction. Check that the motor operates.

3. CHECK MEMORY AND SEAT RESTORING OPERATION





a. Turn the engine switch on (IG) and move the shift lever to P.
b. Move the seat to the maximum front and upper positions via the seat switch.
c. Check that the buzzer sounds for 0.5 seconds and the seat position is memorized when the M1 switch and SET switch are pressed and held.
d. Move the seat out of the maximum front and upper positions via the seat switch.
e. Check that the buzzer sounds for 0.5 seconds and the seat position is memorized when the M2 switch and SET switch are pressed and held.
f. Move the seat to the maximum rear and down positions via the seat switch.
g. Check that the buzzer sounds for 0.5 seconds and the seat position is memorized when the M3 switch and SET switch are pressed and held.
h. Check that the buzzer sounds for 0.1 seconds and the seat automatically moves into the maximum front and upper positions (memorized positions) when the M1 switch of the memory switch is pressed.
i. Check that the buzzer sounds for 0.1 seconds and the seat automatically moves out of the maximum front and upper positions (memorized positions) when the M2 switch of the memory switch is pressed.
j. After turning the engine switch on (IG) and moving the shift lever to P, check that the buzzer sounds for 0.1 seconds and the seat automatically moves into the memorized position when the M1, M2 or M3 switch is pressed.
k. After the engine switch is turned off and the driver side door is opened, check that the buzzer sounds for 0.1 seconds and the seat automatically moves into the memorized position when the M1, M2 or M3 switch is pressed within 30 seconds.
i. Check that the buzzer sounds for 0.1 seconds and the seat automatically moves into the memorized position when the M1, M2 or M3 switch is pressed.
m. Check that the following procedures erase the recorded seat positions of switches M1, M2 and M3: fully slide the seat forward or rearward; hold M1, M2 or M3; disconnect the cable from the negative (-) battery terminal; and wait for 3 minutes.

4. MEMORY CALL FUNCTION
a. AUTOMATIC MEMORY CALL OPERATION INSPECTION
1. With the transmitter's recognition code registered into the memory system, perform an entry unlock or wireless unlock operation. Open the driver door and check that the front seat, front seat belt anchor, steering wheel and outer rear view mirror automatically move to the positions recorded in memory.

b. MEMORY REGISTRATION (WITH WIRELESS FUNCTION)
1. Prepare by recording the driving position through the memory switch (M1, M2 or M3).
2. With the engine switch off and the driver door closed, press and hold both of the following: a memory switch (M1, M2 or M3) and a transmitter switch. Continue holding the switches until the answer-back buzzer sounds.

HINT: Either the LOCK or UNLOCK switch on the transmitter can be pressed.

c. MEMORY REGISTRATION (WITH WIRELESS FUNCTION, CARD TYPE)
1. Prepare by recording the driving position through the memory switch (M1, M2 or M3).
2. Hold only the transmitter to be registered.
3. With the engine switch off and the driver door closed, press and hold both of the following: a memory switch (M1, M2 or M3) and door lock control switch. Continue holding the switches until the answer-back buzzer sounds.

NOTICE: Do not bring 2 or more keys into the vehicle.

HINT:
- Either the lock or unlock switch on the door control switch can be pressed.
- The door control switch on the driver side or front passenger side can be used.

d. MEMORY ERASURE (WITH WIRELESS FUNCTION)
1. With the engine switch off and the driver door closed, press and hold both of the following: the memory SET switch and transmitter switch. Continue holding the switches until the answer-back buzzer sounds.

HINT: Either the LOCK or UNLOCK switch on the transmitter can be pressed.

e. MEMORY ERASURE (WITH WIRELESS FUNCTION, CARD TYPE)
1. Hold only the transmitter of which registration is to be erased.
2. With the engine switch off and the driver door closed, press and hold both of the following: the memory SET switch and door lock control switch. Continue holding the switches until the answer-back buzzer sounds.

NOTICE: Do not bring 2 or more keys into the vehicle.

HINT:
- Either the lock or unlock switch on the door control switch can be pressed.
- The door control switch on the driver side or front passenger side can be used.

5. EMERGENCY STOP FUNCTION
a. During the memory call operation, press a memory switch (M1, M2 or M3), or press a front power seat switch LH (driver seat ECU). Check that the automatic memory call operation stops.
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