Terminals of ECU

Fig 1: Identifying Skid Control ECU Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SKID CONTROL ECU CONNECTORS TERMINALS REFERENCE

Symbols (Terminal No.)	Terminal Description
GND2 (1)	Motor relay ground
BM(2)	Motor relay test input
FR+ (3)	Front RH wheel speed signal input
FL- (4)	Front LH wheel speed signal input
RR+ (5)	Rear RH wheel speed signal input
RL- (6)	Rear LH wheel speed signal input
TRC+ (8)	ECM communication output
ENG+ (9)	ECM communication input
NEO (10)	Engine revolution signal input
CANH (11)	CAN communication line
SP1 (12)	Speed signal output
D/G (13)	Diagnosis tester communication line
MRF (14)	Fail safe motor relay output
MR (15)	Motor relay output
FR- (17)	Front RH wheel speed signal input
FL+ (18)	Front LH wheel speed signal input
RR- (19)	Rear RH wheel speed signal input
RL+ (20)	Rear LH wheel speed signal input
TRC- (22)	ECM communication output
ENG- (23)	ECM communication input
TS (24)	Sensor check input
CANL (25)	CAN communication line
STP (27)	Stop light switch input
PKB (28)	Parking brake switch input
WA (29)	ABS warning light output
BZ (30)	Buzzer output
+BS(31)	Solenoid relay power supply
GND1 (32)	Skid control ECU ground
IND (34)	SLIP Indicator light output
VSCW (36)	VSC warning light output
P(40)	P range switch input
WFSE (42)	WFSE input
CSW (43)	TRAC OFF switch input
BRL (44)	BRAKE warning light output
R+ (45)	Power supply for motor relay
IG1 (46)	IG1 power supply

Terminal Inspection

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

Fig 2: Identifying Skid Control ECU (S1) Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

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

SKID CONTROL ECU (S1) CONNECTORS TERMINALS SPECIFIED CONDITION

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
BM (S1-2) - GND(S1-1,32)	B-R - W-L, W-B	Motor relay test input	IG switch ON, pump motor running	10 to 14 V
TS (S1-24) - GND(S1-1,32)	GR - W-L, W-B	Sensor check input	IG switch ON	10 to 14 V
STP (S1-27) - GND (S1-1,32)	G-W - W-L, W-B	Stop light switch input	Stop light switch ON (Brake pedal pushed)	8 to 14 V
STP (S1-27) - GND (S1-1, 32)	G-W - W-L, W-B	Stop light switch input	Stop light switch OFF (Brake pedal released)	Below 1.5 V
PKB (S1-28) - GND (S1-1,32)	R - W - W-L, W-B	Parking brake switch input	IG switch ON, parking brake switch ON	Below 1.5 V
PKB (S1-28) - GND (S1-1, 32)	R - W - W-L, W-B	Parking brake switch input	IG switch ON, parking brake switch OFF	10 to 14 V
+BS (S1-31) - GND (S1-1,32)	B - W-L, W-B	Solenoid relay power supply	Always	10 to 14 V
WFSE (S1-42) - GND (S1-1, 32)	P - W-L, W-B	WFSE input	IG switch ON	10 to 14 V
CSW (S1-43) - GND (S1-1, 32)	R-Y - W-L, W-B	TRAC OFF switch input	TRAC OFF switch OFF	10 to 14 V
R+ (S1-45) - GND (S1 -1,32)	R - W-L, W-B	Power supply for motor relay	IG switch ON	10 to 14 V
IG1 (S1-46) - GND (S1-1,32)	B-W - W-L, W-B	IG1 power supply	IG switch ON	10 to 14 V

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Terminals Of Ecu