Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

TERMINALS OF ECU

Component without harness connected

(Skid Control ECU (Brake Actuator Assembly))

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

TERMINAL INSPECTION

(a) Disconnect the 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))

HINT:

The voltage cannot be measured with the connector connected to the skid control ECU (brake actuator assembly) because the connector is watertight.

Standard

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A28-1 (+BM) - Body ground	B - Body ground	ABS motor relay power supply	Always	11 to 14 V
A28-6 (CSW) - Body ground	P - Body ground	VSC OFF switch input	VSC OFF switch on → off (Pressed → not pressed)	Below 1 Ω → 10 kΩ or higher
A28-10 (STPO) - Body ground	L - Body ground	Stop light control relay (stop light switch assembly) output	Always	11 to 14 V
A28-14 (GND2) - Body ground	W-B - Body ground	Pump motor ground	Always	Below 1 Ω
A28-30 (+BS) - Body ground	G - Body ground	ABS solenoid relay power supply	Always	11 to 14 V
A28-36 (IG1) - Body ground	B - Body ground	IG1 power source input	Engine switch on (IG)	11 to 14 V
A28-42 (STP) - Body ground	GR - Body ground	Stop light switch assembly input	Stop light switch assembly on → off (Brake pedal depressed → released)	(+BS x 0.85) to 14 V* → Below 1.5 V
A28-43 (HZRI) - Body ground	LG - 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 1 Ω → 10 kΩ or higher
A28-44 (STP2) - Body ground	R - Body ground	Stop light control relay (stop light switch assembly) input	Stop light switch assembly on → off (Brake pedal depressed → released)	(+BS x 0.85) to 14 V* → Below 1.5 V
A28-46 (GND1) - Body ground	W-B - Body ground	Skid control ECU (brake actuator assembly) ground	Always	Below 1 Ω

HINT:

*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Electronically Controlled Brake System(for Gasoline Model): Brake Warning Light Remains ON
DESCRIPTION The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication. If any of the following is detected, the brake system warning light (red indicator) remains on: The skid control ECU (brake actuator assembly) connector is disconnected fr ...

Toyota Avalon (XX50) 2019-2022 Owners Manual