Toyota 4Runner manuals

Toyota 4Runner: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY, MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


(a) Remove the main body ECU (See page ).


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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A-29 (ACC) - Body ground

-

ACC power supply

Ignition switch ACC

11 to 14 V

A-30 (BECU) - Body ground

-

Battery power supply

Always

11 to 14 V

A-32 (IG) - Body ground

-

Ignition power supply

Ignition switch ON

11 to 14 V

A-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

F10-3 (GND2) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Install the main body ECU (See page ).


(d) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F9-3 (HAZ) - 2B-4 (GND1)

W - W-B

Hazard warning signal light signal input

Hazard warning signal switch on

Below 1 V

Hazard warning signal switch off

11 to 14 V

F9-5 (HU) - 2B-4 (GND1)

LG - W-B

Headlight dimmer switch high signal input

Headlight dimmer switch in high

Below 1 V

Headlight dimmer switch in low

11 to 14 V

F9-8 (HF) - 2B-4 (GND1)

V - W-B

Headlight dimmer switch high flash signal input

Headlight dimmer switch in high flash position

Below 1 V

Headlight dimmer switch not in high flash position

11 to 14 V

F9-20 (CLTB) - 2B-4 (GND1)*

P - W-B

Automatic light control sensor power supply output

Ignition switch off

Below 1 V

Ignition switch ON and headlight dimmer switch in AUTO position

11 to 14 V

F9-21 (CLTS) - 2B-4 (GND1)*

R - W-B

Automatic light control sensor signal input

Ignition switch off

Below 1 V

Automatic light control system operates

Pulse generation

(See waveform 1)

F9-27 (FFOG) - 2B-4 (GND1)

L - W-B

Front fog light switch input

Front fog light switch on

Below 1 V

Front fog light switch off

11 to 14 V

F9-28 (A) - 2B-4 (GND1)*

W - W-B

Headlight dimmer switch AUTO signal input

Headlight dimmer switch in AUTO

Below 1 V

Headlight dimmer switch not in AUTO

11 to 14 V

F9-29 (HEAD) - 2B-4 (GND1)

SB - W-B

Headlight dimmer switch head signal input

Headlight dimmer switch in head

Below 1 V

Headlight dimmer switch not in head

11 to 14 V

F9-30 (TAIL) - 2B-4 (GND1)

R - W-B

Headlight dimmer switch tail signal input

Headlight dimmer switch in tail or head

Below 1 V

Headlight dimmer switch in neither tail nor head

11 to 14 V

2D-7 (TRLY) - 2B-4 (GND1)

G - W-B

Clearance light signal output

Headlight dimmer switch in tail position

11 to 14 V

Headlight dimmer switch not in tail position

Below 1 V

2D-9 (FFGO) - 2B-4 (GND1)

W - W-B

Front fog light signal output

Headlight dimmer switch in tail and front fog light switch on

Below 1 V

Front fog light switch off

11 to 14 V

2D-24 (DIM) - 2B-4 (GND1)

P - W-B

H-LP HI relay drive output

Headlight dimmer switch in high or high flash

Below 1 V

Headlight dimmer switch not in high or high flash

11 to 14 V

2D-40 (HRLY) - 2B-4 (GND1)

P - W-B

H-LP LO relay drive output

Headlight dimmer switch in head

Below 1 V

Headlight dimmer switch not in head

11 to 14 V

2E-1 (TRLY) - 2B-4 (GND1)

W - W-B

Battery power supply

Always

11 to 14 V

2F-16 (TRLY) - 2B-4 (GND1)

G - W-B

Taillight and license plate light signal output

Headlight dimmer switch in tail position

11 to 14 V

Headlight dimmer switch not in tail position

Below 1 V

2F-27 (FLCY) - 2B-4 (GND1)

R - W-B

Front door courtesy light switch LH input

Front door LH open

Below 1 V

Front door LH closed

11 to 14 V

  • *: w/ Automatic Light Control System

If the result is not as specified, the main body ECU may have a malfunction.

(1) Waveform 1


Item

Content

Terminal No. (Symbol)

F9-21 (CLTS) - 2B-4 (GND1)

Tool setting

5 V/DIV., 5 ms./DIV.

Condition

Ignition switch ON

Headlight dimmer switch AUTO

Automatic light control sensor with a hand → Automatic light control sensor covered exposed to ambient light

HINT:

If the ambient light becomes brighter, width A becomes narrower.

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