Toyota Tundra Service Manual: 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
  • Vertical (for Driver Side)
  • Lifter (for Driver Side)
  • Reclining
  • Lumbar support
  • Leg support (for Driver Side)

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:

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 (for Driver Side)

(a) Turn the ignition switch to 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 front and upper positions (memorized positions) when the M1 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 to 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 to 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: slide the seat forward or rearward to the desired position; hold M1 or M2; disconnect the cable from the negative (-) battery terminal; and wait for 3 minutes.

4. CHECK MEMORY CALL FUNCTION (for Driver Side)

(a) Automatic memory call function check

(1) With a transmitter key recognition code registered:

Perform a wireless door unlock and check that opening the driver door causes the following:

  • The buzzer sounds for 0.1 seconds.
  • The front seat and outer mirror surface position automatically move to the stored positions.

HINT:

  • The registered transmitter key recognition code is recalled automatically.
  • If the automatic memory call function is not operated, the buzzer will not sound.

(b) Memory registration

(1) With the ignition switch off and the driver door closed, press and hold the M1 or M2 switch while carrying the key. The main body ECU (driver side junction block assembly) will enter transmitter key recognition code registration mode to allow a key to be linked to the mirror surface memory position.

HINT:

If the memory switch is released before entering registration mode, the memory switch will not enter registration mode.

(2) When the manual LOCK or UNLOCK switch on the power window regulator master switch assembly is pressed, check that the buzzer sounds for 0.5 seconds.

(3) When the door key cylinder LOCK or UNLOCK position by the key, check that the buzzer sounds for 0.5 seconds.

(c) Memory deletion

(1) With the ignition switch off and the driver door closed, press and hold the SET switch while carrying the key. The main body ECU (driver side junction block assembly) will enter transmitter key recognition code deletion mode.

HINT:

If the memory switch is released before entering deletion mode, the memory switch will not enter deletion mode.

(2) When the manual LOCK or UNLOCK switch on the power window regulator master switch assembly is pressed, check that the buzzer sounds twice (0.1 seconds each time).

(3) When the door key cylinder LOCK or UNLOCK position by the key, check that the buzzer sounds twice (0.1 seconds each time).

5. MEMORY CALL EMERGENCY STOP FUNCTION (for Driver Side)

(a) While a memory call function is operating, check that performing one of the following will stop the memory call operation: 1) press the SET switch, M1 switch or M2 switch, 2) press the power seat switch position, or 3) ignition switch on and shift lever is not in P.

6. CHECK POWER SEAT POWER EASY ACCESS SYSTEM (for Driver Side)

HINT:

When troubleshooting a function, first make sure that the function is set to the default or Short setting.

(a) Away function

(1) Turn the ignition switch off and move the shift lever to P.

(2) Disengage the seat belt tongue plate from the buckle.

(3) Make sure that the seat slides rearwards.

(b) Return function

(1) Turn the ignition switch to ACC or ON or engage the seat belt tongue plate with the buckle.

(2) Make sure that the seat slides forward.

    One or more Power Seat Motors do not Operate

    Parts Location

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