Terminals of ECU

Fig 1: Identifying Skid Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ECU CONNECTOR TERMINALS REFERENCE CHART

Symbols (Terminal No.)	Terminal Description
GND1 (1)	Skid control ECU ground
+BS (2)	Solenoid valve power supply
P(6)	P range switch input
FL- (9)	Front LH wheel speed signal input (-)
FL+ (10)	Front LH wheel speed signal input (+)
D/G (13)	Diagnosis tester communication line
STP (14)	Stop light switch input
RL+(15)	Rear LH wheel speed signal input (+)
RL- (16)	Rear LH wheel speed signal input (-)
WA (17)	ABS warning light output
SP1 (18)	Speed signal output for meter
TS (20)	Sensor diagnosis check input
TC(21)	Diagnosis tester communication line
PKB (23)	Parking brake switch input
+BM(31)	Motor relay power supply
GND2 (32)	Skid control ECU ground
N (36)	N range switch input
FR- (39)	Front RH wheel speed signal input (-)
FR+ (40)	Front RH wheel speed signal input (+)
BRL (43)	BRAKE warning light output
RR+ (44)	Rear RH wheel speed signal input (+)
RR- (45)	Rear RH wheel speed signal input (-)
IG1 (46)	ECU power supply

Terminal Inspection

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

Fig 2: Identifying Skid Control ECU (S1) Connector 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.

ECU CONNECTOR TERMINALS VOLTAGE SPECIFIED CONDITION

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
+BS (2) - GND1 (1)	R - W-B	Solenoid valve power supply	Always	10 to 14 V
STP(14) - GND1 (1)	G-W - W-B	Stop light switch input	Stop light switch ON	10 to 14 V
WA (17) - GND1 (1)	W-R - W-B	ABS warning light output	IG switch ON, ABS warning light ON	4 V or more
PKB (23) - GND1 (1)	R - W - W-B	Parking brake switch input	IG switch ON, parking brake switch ON	Below 2.0 V
PKB (23) - GND1 (1)	R - W - W-B	Parking brake switch input	IG switch ON, parking brake switch OFF	8 to 14 V
+BM (31) - GND2 (32)	L - W-B	Motor relay power supply	Always	10 to 14 V
BRL (43) - GND1 (1)	R - W-B	BRAKE warning light output	IG switch ON, BRAKE warning light ON	4 V or more
IG1 (46) - GND1 (1)	B-W - W-B	ECU 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