Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Terminals Of Ecu

TERMINALS OF ECU

1. TERMINALS OF ECU

Text in Illustration

Component without harness connected

(Skid Control ECU)

Terminal No. (Symbol)	Terminal Description
A6-1 (GND1)	Skid control ECU ground
A6-2 (+BM1)	Power supply for motor
A6-3 (FR+)	Front speed sensor RH power supply output
A6-4 (FL-)	Front speed sensor LH input
A6-5 (RR+)	Rear speed sensor RH power supply output
A6-6 (RL-)	Rear speed sensor LH input
A6-7 (STP)	Stop light switch assembly
A6-9 (CSW)	VSC OFF switch
A6-11 (CANH)	CAN communication terminal H
A6-12 (SP1)	Speedometer signal
A6-13 (ATRC)*2	A-TRAC switch
A6-16 (STPO)	Stop light switch assembly
A6-17 (FR-)	Front speed sensor RH input
A6-18 (FL+)	Front speed sensor LH power supply output
A6-19 (RR-)	Rear speed sensor RH input
A6-20 (RL+)	Rear speed sensor LH power supply output
A6-24 (TS)	Sensor test terminal (Signal check switch)
A6-25 (CANL)	CAN communication terminal L
A6-27 (EXI)*2	for Part-time 4WD: A.D.D. detection switch for Full-time 4WD: Center differential lock detection switch
A6-31 (+BS)	Power supply for solenoid
A6-32 (GND2)	Skid control ECU ground
A6-40 (EXI3)	w/ Rear Differential Lock: Rear differential lock detection switch w/o Rear Differential Lock1: IG power supply w/o Rear Differential Lock2: Front wheel drive ECU
A6-41 (LBL)	Brake fluid level warning switch
A6-44 (HDCS)*3	Downhill assist control switch
A6-45 (STP2)	Stop light switch assembly
A6-46 (IG1)	IG1 power supply
A7-1 (IG2)	IG2 power supply
A7-2 (+BM2)	Power supply for motor
A7-4 (GND3)	Skid control ECU ground

*1: for 2WD
*2: for 4WD
*3: w/ Downhill Assist Control

2. TERMINAL INSPECTION

(a) Disconnect the connector and measure the voltage or resistance on the wire harness side.

HINT:

The voltage cannot be measured with the connector connected to the skid control ECU as the connector is watertight.

Text in Illustration

Front view of wire harness connector

(to Skid Control ECU)

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A6-1 (GND1) - Body ground	W-B	Ground	Always	Below 1 Ω
A6-2 (+BM1) - Body ground	B	Power supply for motor (from battery)	Always	11 to 14 V
A6-7 (STP) - Body ground	L	Stop light switch assembly	Brake pedal depressed → released	8 to 14 V → Below 1.5 V
A6-9 (CSW) - Body ground	V-W	VSC OFF switch input	VSC OFF switch off → on and held	10 kΩ or higher → Below 1 Ω
A6-13 (ATRC) - Body ground*1	LG	A-TRAC switch input	A-TRAC switch off → on and held	10 kΩ or higher → Below 1 Ω
A6-16 (STPO) - Body ground	LG-B	Stop light switch assembly	Always	11 to 14 V
A6-31 (+BS) - Body ground	L-R	Power supply for solenoid (from battery)	Always	11 to 14 V
A6-32 (GND2) - Body ground	W-B	Ground	Always	Below 1 Ω
A6-41 (LBL) - Body ground	V-G	Brake fluid level warning switch	Brake fluid level +/-5 mm (+/-0.197 in.) from minimum level → maximum level	Below 1 Ω → 1.9 to 2.1 kΩ
A6-44 (HDCS) - Body ground*2	P	Downhill assist control switch input	Downhill assist control switch off → on	10 kΩ or higher → Below 1 Ω
A6-45 (STP2) - Body ground	V-G	Stop light switch assembly	Brake pedal depressed → released	8 to 14 V → Below 1.5 V
A6-46 (IG1) - Body ground	G	IG1 power supply	Ignition switch off → ON	Below 1 V → 11 to 14 V
A7-1 (IG2) - Body ground	W	IG2 power supply	Ignition switch off → ON	Below 1 V → 11 to 14 V
A7-2 (+BM2) - Body ground	B	Power supply for motor (from battery)	Always	11 to 14 V
A7-4 (GND3) - Body ground	W-B	Ground	Always	Below 1 Ω

*1: for 4WD
*2: w/ Downhill Assist Control

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