Toyota 4Runner: Operation Check

Toyota 4Runner Service Manual / Vehicle Interior / Seat / Front Power Seat Control System(w/o Memory) / Operation Check

OPERATION CHECK

1. CHECK FRONT POWER SEAT FUNCTION

(a) Check the basic functions.

Text in Illustration

*a	Sliding function
*b	Front vertical function
*c	Lifter function
*d	Reclining function
*e	Lumbar support function

(1) Operate the power seat switches and check to make sure each seat function operates properly:

Sliding
Front vertical (for driver side)
Lifter (for driver side)
Reclining
Lumbar support (for driver side)

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

(a) Check the PTC thermistor operation inside the power seat motor.

HINT:

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

NOTICE:

Make sure the inspection is 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 stops).

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 LUMBAR SUPPORT MOTOR

(a) Check the PTC thermistor operation inside the lumbar support motor.

NOTICE:

Make sure the inspection is performed with the seat installed in the vehicle.

(1) Operate the power seat switch assembly and move the lumbar support to either the foremost or rearmost position. Keep the lumbar support in that position for approximately 60 seconds.

(2) Operate the power seat switch assembly again and continue to try to move the lumbar support in the same direction as in the previous step. Measure the time until current is cut (adjuster operation sound stops).

Standard:

4 to 90 seconds

(3) After current is cut, release the power seat switch assembly and wait for approximately 60 seconds.

(4) Operate the power seat switch assembly and move the lumbar support in the opposite direction. Check that the motor operates.

System Diagram

SYSTEM DIAGRAM ...

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are lis ...

Other materials about Toyota 4Runner:

Open Circuit in IG1/IG2 Power Source Circuit (C1242)
DESCRIPTION If there is a problem with the master cylinder solenoid (skid control ECU) power supply circuit, the skid control ECU stores DTCs and prohibits operation under the fail-safe function. If the voltage supplied to the IG2 terminal is within the ...

Rear Suspension System
Problem Symptoms Table PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspe ...

0.0133