Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Vehicle Interior / Seat / Climate Control Seat System / Terminals Of Ecu

TERMINALS OF ECU

1. AIR CONDITIONING AMPLIFIER

(a) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F87-9 (ROUT) - Body ground	LG - Body ground	Output climate control signal (Front passenger side)	Engine switch on (IG) Refreshing seat switch RH blower side level 3	Pulse generation (see waveform 1)
F87-10 (LOUT) - Body ground	L - Body ground	Output climate control signal (Driver side)	Engine switch on (IG) Refreshing seat switch LH blower side level 3	Pulse generation (see waveform 1)
F87-15 (SW 5) - Body ground	W - Body ground	Input climate control signal (Front passenger side)	Engine switch on (IG) Refreshing seat switch RH level 0	4.5 to 5.5 V
F87-15 (SW 5) - Body ground	W - Body ground	Input climate control signal (Front passenger side)	Engine switch on (IG) Refreshing seat switch RH blower side level 3	Below 1 V
F87-16 (SW 4) - Body ground	V - Body ground	Input climate control signal (Driver side)	Engine switch on (IG) Refreshing seat switch LH level 0	4.5 to 5.5 V
F87-16 (SW 4) - Body ground	V - Body ground	Input climate control signal (Driver side)	Engine switch on (IG) Refreshing seat switch LH blower side level 3	Below 1 V
F42-31 (S5-4) - Body ground	V - Body ground	Power supply	Engine switch on (IG)	4.5 to 5.5 V
F42-35 (SG-4) - Body ground	SB - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, the air conditioning amplifier may have a malfunction.

(1) Using an oscilloscope, check waveform 1.

Waveform 1 (Reference)

Item	Content
Terminal No. (Symbol)	F87-9 (ROUT) - Body ground F87-10 (LOUT) - Body ground
Tool Setting	2 V/DIV., 500 μsec/DIV.
Condition	Engine switch on (IG) Refreshing seat switch blower side level 3

Item

Content

Terminal No. (Symbol)

F87-9 (ROUT) - Body ground

F87-10 (LOUT) - Body ground

Tool Setting

2 V/DIV., 500 μsec/DIV.

Condition

Engine switch on (IG)

Refreshing seat switch blower side level 3

On-vehicle Inspection

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