Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System / 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.

(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
F9-3 (HAZ) - 2B-4 (GND1)	W - W-B	Hazard warning signal light signal input	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
F9-5 (HU) - 2B-4 (GND1)	LG - W-B	Headlight dimmer switch high signal input	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
F9-8 (HF) - 2B-4 (GND1)	V - W-B	Headlight dimmer switch high flash signal input	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
F9-20 (CLTB) - 2B-4 (GND1)*	P - W-B	Automatic light control sensor power supply output	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
F9-21 (CLTS) - 2B-4 (GND1)*	R - W-B	Automatic light control sensor signal input	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
F9-27 (FFOG) - 2B-4 (GND1)	L - W-B	Front fog light switch input	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
F9-28 (A) - 2B-4 (GND1)*	W - W-B	Headlight dimmer switch AUTO signal input	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
F9-29 (HEAD) - 2B-4 (GND1)	SB - W-B	Headlight dimmer switch head signal input	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
F9-30 (TAIL) - 2B-4 (GND1)	R - W-B	Headlight dimmer switch tail signal input	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
2D-7 (TRLY) - 2B-4 (GND1)	G - W-B	Clearance light signal output	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
2D-9 (FFGO) - 2B-4 (GND1)	W - W-B	Front fog light signal output	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
2D-24 (DIM) - 2B-4 (GND1)	P - W-B	H-LP HI relay drive output	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
2D-40 (HRLY) - 2B-4 (GND1)	P - W-B	H-LP LO relay drive output	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
2F-16 (TRLY) - 2B-4 (GND1)	G - W-B	Taillight and license plate light signal output	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
2F-27 (FLCY) - 2B-4 (GND1)	R - W-B	Front door courtesy light switch LH input	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

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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