Toyota 4Runner manuals

Toyota 4Runner: 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

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

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

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