Terminals Of Ecu

TERMINALS OF ECU

Fig 1: ECU Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TEXT IN ILLUSTRATION

Component without harness connected
(Skid Control ECU)

Terminal No. (Symbol)	Terminal Description
1 (GND1)	Skid control ECU ground
2 (STP1)	Stop light switch input
4 (RL-)	Rear wheel speed LH (-) signal input
5 (RL+)	Rear wheel speed LH (+) power supply output
6 (FR-)	Front wheel speed RH (-) signal input
7 (FR+)	Front wheel speed RH (+) power supply output
11 (SP1)	Speed signal output for speedometer
12 (+BS)	Solenoid relay power supply
13 (GND2)	Pump motor ground
14 (CANL)	CAN communication line L
16 (RR-)	Rear wheel speed RH (-) signal input
17 (RR+)	Rear wheel speed RH (+) power supply output
18 (FL-)	Front wheel speed LH (-) signal input
19 (FL+)	Front wheel speed LH (+) power supply output
21 (BZ)	Skid control buzzer output
22 (STP2)	Stop light control relay input
24 (BM)	Motor relay power supply
25 (CANH)	CAN communication line H
27 (FSW+)	Brake pedal load sensing switch input
30 (CSW)	VSC OFF switch input
31 (STPO)	Stop light control relay output
33 (TS)	Sensor check input
34 (IG1)	ECU power supply

TERMINAL INSPECTION

Disconnect the connectors and measure the voltage or resistance on the wire harness side.

Fig 2: Skid Control ECU Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TEXT IN ILLUSTRATION

Front view of wire harness connector
(to Skid Control ECU)

HINT:

Voltage cannot be measured with the connectors connected to the skid control ECU as the connectors are watertight.

STANDARD

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A4-1 (GND1) - Body ground	W-B - Body ground	Skid control ECU ground	Always	Below 1 Ω
A4-2 (STP1) - Body ground	L - Body ground	Stop light switch input	Stop light switch on → off (Brake pedal depressed → released)	8 to 14 V → Below 1.5 V
A4-12 (+BS) - Body ground	W - Body ground	Solenoid relay power supply	Always	11 to 14 V
A4-13 (GND2) - Body ground	W-B - Body ground	Pump motor ground	Always	Below 1 Ω
A4-21 (BZ) - Body ground	G-O - Body ground	Skid control buzzer output	Ignition switch ON, buzzer not sounding	6 to 10 V
A4-22 (STP2) - Body ground	G - Body ground	Stop light control relay input	Stop light switch on → off (Brake pedal depressed → released)	8 to 14 V → Below 1.5 V
A4-24 (BM) - Body ground	B-R - Body ground	Motor relay power supply	Always	11 to 14 V
A4-27 (FSW+) - Body ground	Y - Body ground	Brake pedal load sensing switch input	Brake pedal load sensing switch off → on (Brake pedal depressed → released)	950 to 1050 Ω → 203 to 223 Ω
A4-30 (CSW) - Body ground	P - Body ground	VSC OFF switch input	VSC OFF switch held on → off (Released)	Below 1 Ω → 10 kΩ or higher
A4-31 (STPO) - Body ground	G-B - Body ground	Stop light control relay output	Ignition switch to ON	11 to 14 V
A4-34 (IG1) - Body ground	L - Body ground	ECU power supply	Ignition switch to ON	11 to 14 V