Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

Toyota Tacoma 2015-2018 Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / Terminals Of Ecu

TERMINALS OF ECU

Text in Illustration

Component without harness connected

(Skid Control ECU [Brake Actuator Assembly])

Terminal No. (Symbol)	Terminal Description
1 (GND2)	Pump motor ground
2	- (Not used)
3 (EXI)*1	4WD detection switch (Transfer shift actuator assembly) input
3 (EXI)*1	A.D.D. position switch (Differential motor actuator assembly) signal input
4	- (Not used)
5 (EXI4)*1	L4 detection switch (Transfer shift actuator assembly) input
6	- (Not used)
7 (STP2)*2	Stop light switch assembly input
8	- (Not used)
9	- (Not used)
10 (CANL)	CAN communication line L
11 (EXI3)	Back up light sw input
12 (IG1)	ECU power supply input
13 (BM)	Motor relay power supply
14 (SP1)	Speed signal output for speedometer
15 (RR-)	Rear wheel speed RH (-) signal input
16 (RR+)	Rear wheel speed RH (+) power supply output
17 (FL-)	Front wheel speed LH (-) signal input
18 (FL+)	Front wheel speed LH (+) power supply output
19	- (Not used)
20	- (Not used)
21	- (Not used)
22 (CANH)	CAN communication line H
23	- (Not used)
24 (TS)*3	Sensor check input
25 (GND1)	Skid control ECU (Brake actuator assembly) ground
26 (STPO)*2	STOP Relay output
27 (HDCS)	4WD identification signal input*1
28 (RL-)	Rear wheel speed LH (-) signal input
29 (RL+)	Rear wheel speed LH (+) power supply output
30 (FR-)	Front wheel speed RH (-) signal input
31 (FR+)	Front wheel speed RH (+) power supply output
32	- (Not used)
33 (CSW)	VSC OFF switch input
34	- (Not used)
35 (STP)	STOP Relay input
36	- (Not used)
37	- (Not used)
38 (+BS)	Solenoid relay power supply

*1: for 4WD
*2: w/ Trailer Towing
*3: w/o Toyota Safety Sense P

1. TERMINAL INSPECTION

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

Text in Illustration

Front view of wire harness connector

(to Skid Control ECU [Brake Actuator Assembly])

HINT:

Voltage cannot be measured with the connector connected to the skid control (brake actuator assembly) as the connector is watertight.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
S1-1 (GND2) - Body ground	W-B - Body ground	Pump motor ground	Always	Below 1 Ω
S1-3 (EXI) - Body ground*1	LG - Body ground	4WD detection switch (Transfer shift actuator assembly) input	Ignition switch ON 4WD control switch (Transfer position switch) set to H2	11 to 14 V
S1-3 (EXI) - Body ground*1	LG - Body ground	A.D.D. position switch (Differential motor actuator assembly) signal input	Ignition switch ON 4WD control switch (Transfer position switch) not set to L4	11 to 14 V
S1-5 (EXI4) - Body ground*1	GR - Body ground	L4 detection switch (Transfer shift actuator assembly) input	Ignition switch ON 4WD control switch (Transfer position switch) not set to L4	11 to 14 V
S1-7 (STP2) - Body ground	L - Body ground	Stop light switch assembly input	Stop light switch assembly on → off (Brake pedal depressed → released)	8 to 14 V → Below 1.5 V
S1-12 (IG1) - Body ground	G - Body ground	ECU power supply input	Ignition switch ON	11 to 14 V
S1-13 (BM) - Body ground	B - Body ground	Motor relay power supply	Always	11 to 14 V
S1-14 (SP1) - Body ground	G - Body ground	Speed signal output for speedometer	Ignition switch ON	11 to 14 V
S1-25 (GND1) - Body ground	W-B - Body ground	Skid control ECU (Brake actuator assembly) ground	Always	Below 1 Ω
S1-26 (STPO) - Body ground	B - Body ground	STOP Relay output	Ignition switch ON	11 to 14 V
S1-33 (CSW) - Body ground	GR - Body ground	VSC OFF switch input	VSC OFF switch pressed and held → released	Below 1 Ω → 10 kΩ or higher
S1-35 (STP) - Body ground	SB - Body ground	STOP Relay input	Stop light switch assembly on → off (Brake pedal depressed → released)	8 to 14 V → Below 1.5 V
S1-38 (+BS) - Body ground	R - Body ground	Solenoid relay power supply	Always	11 to 14 V

*1: for 4WD

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