Toyota 4Runner: Problem Symptoms Table

Toyota 4Runner Service Manual / Vehicle Interior / Seat / Front Power Seat Control System(w/ Memory) / 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 "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 this system before inspecting the suspected areas below.

Front Power Seat Control System (for Driver Side)

Symptom	Suspected Area	See page
Front power seat does not operate with front power seat switch	Proceed to "Front Power Seat does not Operate with Front Power Seat Switch"
Power seat position is not memorized	Proceed to "Power Seat Position is not Memorized"
Power seat does not return to memorized position	Front power seat switch LH	-
Power seat does not return to memorized position	Main body ECU (multiplex network body ECU)	-
Lumbar support function does not operate	Power seat switch assembly
	Separate type front seatback spring assembly LH (Lumbar support motor)
	Harness or connector	-

Front Power Seat Control System (for Passenger Side)

Symptom	Suspected Area	See page
All functions do not operate	Front power seat switch RH
All functions do not operate	Harness or connector	-
Only slide function does not operate	Front power seat switch RH
	Separate type front seat cushion spring assembly (Slide motor)
	Harness or connector	-
Only reclining function does not operate	Front power seat switch RH
	Separate type front seatback spring assembly RH (Reclining motor)
	Harness or connector	-

Operation Check

OPERATION CHECK 1. CHECK FRONT POWER SEAT FUNCTION (a) Check the basic functions. Text in Illustration *a Sliding Function *b Front Vertical Func ...

Terminals Of Ecu

TERMINALS OF ECU 1. CHECK FRONT POWER SEAT SWITCH LH (a) Disconnect the b18 and b19 connectors from the front power seat switch LH. (b) Measure the voltage and resistance according to the value(s ...

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Fail-safe Chart
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Installation
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