Terminals Of Ecu [06/2018 - 01/2019]

TERMINALS OF ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component without harness connected
(Skid Control ECU (Brake Actuator Assembly))

HINT:

As a waterproof connector is used for the brake actuator assembly, voltage and waveform inspections cannot be performed with the connector connected.

Use the Techstream to read data and perform Active Tests when inspecting the operation and communication status of the brake actuator assembly.
Refer to DATA LIST / ACTIVE TEST [06/2018 - 01/2019]

Terminal No. (Symbol)	Terminal Description
1 (+BM)	ABS motor relay power supply
2	-
3	-
4	-
5 (CANH)	CAN communication line H
6	-
7 (FL-)	Front wheel speed LH (-) signal input
8	-
9	-
10	-
11	-
12	-
13	-
14 (GND2)	Pump motor ground
15	-
16	-
17	-
18	-
19 (CANL)	CAN communication line L
20	-
21 (FR+)	Front wheel speed RH (+) power supply output
22 (RR+)	Rear wheel speed RH (+) power supply output
23 (RL-)	Rear wheel speed LH (-) signal input
24 (FL+)	Front wheel speed LH (+) power supply output
25	-
26 (FR-)	Front wheel speed RH (-) signal input
27	-
28	-
29	-
30 (+BS)	ABS solenoid relay power supply
31	-
32	-
33 (STPO)	Stop light control relay (stop light switch assembly) output
34 (SP1)	Speed signal output
35	-
36 (IG1)	IG1 power source input
37 (RR-)	Rear wheel speed RH (-) signal input
38 (CSW)	VSC OFF switch (combination switch assembly) input
39 (RL+)	Rear wheel speed LH (+) power supply output
40	-
41 (STP)	Stop light switch assembly signal input
42 (HZRI)	Brake hold switch (electric parking brake switch assembly) input
43 (STP2)	Stop light signal input
44	-
45	-
46 (GND1)	Skid control ECU (brake actuator assembly) ground

TERMINAL INSPECTION

Disconnect the A51 skid control ECU (brake actuator assembly) connector and measure the voltage and resistance on the wire harness side.

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

Measure the voltage or resistance according to the value(s) in the table below.

STANDARD

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A51-1 (+BM) - Body ground	L - Body ground	ABS motor relay power supply	Always	11 to 14 V
A51-14 (GND2) - Body ground	W-B - Body ground	Pump motor ground	Always	Below 1 Ω
A51-30 (+BS) - Body ground	W - Body ground	ABS solenoid relay power supply	Always	11 to 14 V
A51-33 (STPO) - Body ground	BE - Body ground	Stop light control relay (stop light switch assembly) output	Always	11 to 14 V
A51-36 (IG1) - Body ground	B - Body ground	IG1 power source input	Engine switch on (IG)	11 to 14 V
A51-38 (CSW) - Body ground	BR - Body ground	VSC OFF switch (combination switch assembly) input	VSC OFF switch (combination switch assembly) on → off (Pressed → not pressed)	Below 50 Ω → 10 kΩ or higher
A51-41 (STP) - Body ground	B - Body ground	Stop light switch assembly signal input	Stop light switch assembly on → off (Brake pedal depressed → released)	11 to 14 V → 1.5 V or less
A51-42 (HZRI) - Body ground	L - Body ground	Brake hold switch (electric parking brake switch assembly) input	Brake hold switch (electric parking brake switch assembly) on → off (Pressed → not pressed)	Below 50 Ω → 10 kΩ or higher
A51-43 (STP2) - Body ground	LG - Body ground	Stop light signal input	Stop light switch assembly on → off (Brake pedal depressed → released)	11 to 14 V → 1.5 V or less
A51-46 (GND1) - Body ground	W-B - Body ground	Skid control ECU (brake actuator assembly) ground	Always	Below 1 Ω