Terminals Of Ecu

TERMINALS OF ECU

Fig 1: Identifying Skid Control ECU Connector Terminals (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TERMINAL DESCRIPTION TABLE

Symbols (Terminal No.)

Terminal Description

GND1 (1)

Skid control ECU ground

+BM1 (2)

Power supply for motor

FR+ (3)

Front wheel speed sensor RH power supply output

FL - (4)

Front wheel speed sensor LH input

RR+ (5)

Rear wheel speed sensor RH power supply output

RL- (6)

Rear wheel speed sensor LH input

STP (7)

Stop light switch input

NEO (10)⁽¹⁾

Center diff. lock indicator light input

CANH (11)

CAN communication line H

SP1 (12)

Speed signal output to combination meter

D/G (13)

Diagnosis tester communication line

P (14)

Shift position indicator P signal input

INFR (15)

AUTO LSD indicator light output

STPO (16)

Stop light operation relay output

FR-(17)

Front wheel speed sensor RH input

FL+(18)

Front wheel speed sensor LH power supply output

RR-(19)

Rear wheel speed sensor RH input

RL+ (20)

Rear wheel speed sensor LH power supply output

EXI4 (21)⁽¹⁾

4WD control (L4) switch input

TS (24)

Sensor test terminal (Signal check switch) input

CANL (25)

CAN communication line L

EXI3 (26) ⁽¹⁾

ADD (Auto disconnected differential lock) change over actuator switch input Ground

EXI (27) ⁽¹⁾

Center diff. lock switch input

PKB (28)

Parking brake switch input

WA (29)

ABS warning light output

BZ (30)

Skid control buzzer output

+BS (31)

Power supply for solenoid

GND2 (32)

Skid control ECU ground

HDCW (33)

Downhill assist control indicator light output

IND (34)

SLIP indicator light output

VSCW (36)

VSC OFF indicator light output

FRO (37)

Front RH wheel speed output

FLO (38)

Front LH wheel speed output

LBL (41)

Brake fluid level warning switch input

WFSE (42)

Write flash enable input

CSW (43)

VSC OFF switch input

HDCS (44)

Downhill assist control switch input

STP2 (45)

Stop light switch input

IG1 (46)

IG1 power supply

⁽¹⁾

4WD

Fig 2: Identifying Skid Control ECU Connector Terminals (2 Of 2)

TERMINAL DESCRIPTION TABLE

Symbols (Terminal No.)	Terminal Description
IG2 (1)	IG2 Power supply
+BM2 (2)	Power supply for motor
BRL (3)	BRAKE warning light output
GND3 (4)	Skid control ECU ground

TERMINAL INSPECTION

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

HINT:

Voltage cannot be measured with the connector connected to the skid control ECU as the connector is water resistance.

Fig 3: Identifying Skid Control ECU Connector Terminals

TERMINAL DESCRIPTION TABLE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
+BM1 (S28-2) - GND (S28-1, 32) (S29-4)	Y-B - W-B	Power supply for motor (from battery)	Always	11 to 14 V
STP (S28-7) - GND (S28-1, 32) (S29-4)	G-B - W-B	Stop light switch input	Stop light switch ON → OFF (Brake pedal depressed → released)	8 to 14 V → Below 1.5 V
P (S28-14) - GND (S28-1, 32) (S29-4)	G-B - W-B	Shift position indicator P signal input	Ignition switch ON, shift P position → any shift position except P	8 to 14 V → Below 1.5 V
PKB (S28-28) - GND (S28-1, 32) (S29-4)	LG - W-B	Parking brake switch input	Ignition switch ON, parking brake switch ON → OFF	Below 1.5 V → 10 to 14 V
+BS (S28-31) - GND (S28-1, 32) (S29-4)	Y-W-B	Power supply for solenoid (from battery)	Always	11 to 14 V
LBL (S28-41) - GND (S28-1, 32) (S29-4)	LG - W-B	Brake fluid level warning switch input	Brake fluid level is - 5 mm from the minimum level → maximum level	Below 1 Ω → 1.9 to 2.1 kΩ
STP2 (S28-45) - GND (S28-1, 32) (S29-4)	G-Y - W-B	Stop light switch input	Stop light switch ON → OFF (Brake pedal depressed → released)	8 to 14 V → Below 1.5 V
IG1 (S28-46) - GND (S28-1, 32) (S29-4)	B-R - W-B	IG1 power supply	Ignition switch OFF → ON	Below 1 V → 10 to 14 V
IG2 (S29-1) - GND (S28-1, 32) (S29-4)	B-O - W-B	IG2 power supply	Ignition switch OFF → ON	Below 1 V → 10 to 14 V
+BM2 (S29-2) - GND (S28-1, 32) (S29-4)	Y-B - W-B	Power supply for motor (from battery)	Always	11 to 14 V