Toyota Tundra. Manual — part 611

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:



Use the following procedures to troubleshoot the front power seat control system.



*: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP

2. INSPECT BATTERY VOLTAGE

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding.

3. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

a. Use the Techstream to check if the CAN communication system is functioning normally (see

DIAGNOSIS SYSTEM ).

Result

DTC RESULT REFERENCE

B: Go to CAN COMMUNICATION SYSTEM (See DIAGNOSIS SYSTEM )

A: Go to next step

4. PROBLEM SYMPTOMS TABLE

Result

RESULT REFERENCE

B: Go to step 6

A: Go to next step

ECU and seat position changes according to memory.

Result

Proceed to

CAN DTC is not output

A

CAN DTC is output

B

Result

Proceed to

Fault is not listed in problem symptoms table

A

Fault is listed in problem symptoms table

B

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Seat - Tundra

5. OVERALL ANALYSIS AND TROUBLESHOOTING*

a. See OPERATION CHECK

b. See TERMINALS OF ECU

6. ADJUST, REPAIR OR REPLACE

7. CONFIRMATION TEST

NEXT: END

OPERATION CHECK

1. CHECK FRONT POWER SEAT FUNCTION

Fig. 6: Identifying Front Power Seat Function
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Check the basic functions.

1. Operate the power seat switches and check to make sure each seat function works:



Sliding



Front vertical (for Driver Seat)



Lifter (for Driver Seat)



Reclining



Lumbar support



Leg support (for Driver Seat)

2. CHECK POWER SEAT MOTOR ASSEMBLY (SLIDING, FRONT VERTICAL, LIFTER,

RECLINING, LUMBAR SUPPORT AND LEG SUPPORT)

a. Check the PTC operation inside the power seat motor.

HINT:

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Seat - Tundra

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.

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

Fig. 7: Identifying Memory And Seat Restoring Operation
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Turn the ignition switch ON 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. Check that the buzzer sounds for 0.1 seconds and the seat automatically moves into the maximum

NOTE:



The inspection should be performed with the seat installed in
the vehicle.



Perform the 4 steps below for each power seat function.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Seat - Tundra

front and upper positions (memorized positions) when the Ml switch of the memory switch is
pressed.

g. 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.

h. After turning the ignition switch ON 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 or M2
switch is pressed.

i. After the ignition 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
or M2 switch is pressed within 30 seconds.

j. After turning the ignition switch ON 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 or M2
switch is pressed.

k. Check that the following procedures erase the recorded seat positions of switches M1 and M2: fully

slide the seat forward or rearward; hold M1 or M2; disconnect the cable from the negative (-)
battery terminal; and wait for 3 minutes.

PROBLEM SYMPTOMS TABLE

HINT:



Use the table below to help determine the cause of the problem symptom. The potential causes of the
symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each
symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.



Inspect the fuses and relays related to the system before inspecting the suspected areas below.

Front power seat control system

FRONT POWER SEAT CONTROL SYSTEM

Symptom

Suspected Area

See

Front Power Seat does not
Operate with Front Power Seat
Switch

Front power seat switch LH

POWER SEAT SWITCH (W/O

SEAT POSITION MEMORY

SYSTEM)

Front seat adjuster assembly LH

FRONT POWER SEAT

MOTOR ASSEMBLY (FOR

POWER SEAT)

Front power seat lumbar switch
(for LH)

FRONT POWER SEAT

LUMBAR SWITCH (FOR

POWER SEAT)

Leg support adjustment switch

POWER SEAT SWITCH (W/O

SEAT POSITION MEMORY

SYSTEM)

Front power seat switch RH

POWER SEAT SWITCH (W/O

SEAT POSITION MEMORY

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Seat - Tundra