Terminals Of Ecu [12/2021 - ]

CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

Disconnect the A104 No. 1 skid control ECU (brake booster with master cylinder assembly) connector and measure the voltage or resistance on the wire harness side.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Front view of wire harness connector
(to No. 1 Skid Control ECU (Brake Booster with Master Cylinder Assembly))

HINT:

The voltage cannot be measured with the connector connected to the No. 1 skid control ECU (brake booster with master cylinder assembly) as the connector is watertight.

STANDARD

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
A104-1 (MRI1) - Body ground	Brake booster with accumulator pump assembly power supply input	Always	11 to 14 V
A104-2 (MGND) - Body ground	Brake booster with accumulator pump assembly ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω
A104-3 (SKS1)	Brake pedal stroke sensor 1 signal input	-	-
A104-4	-	-	-
A104-5	-	-	-
A104-6	-	-	-
A104-7	-	-	-
A104-8	-	-	-
A104-9	-	-	-
A104-10	-	-	-
A104-11	-	-	-
A104-12 (LBL)	Brake fluid level warning switch (Brake booster with master cylinder assembly) input	-	-
A104-13	-	-	-
A104-14 (+BI1) - Body ground	+BI1 power source input	Always	11 to 14 V
A104-15 (BS) - Body ground	Solenoid power supply input	Always	11 to 14 V
A104-16 (VSK1)	Brake pedal stroke sensor 1 power supply output	-	-
A104-17	-	-	-
A104-18 (SKG1)	Brake pedal stroke sensor 1 ground	-	-
A104-19	-	-	-
A104-20	-	-	-
A104-21	-	-	-
A104-22	-	-	-
A104-23	-	-	-
A104-24	-	-	-
A104-25 (CSW2)	No. 2 skid control ECU (brake actuator assembly) operation signal output	-	-
A104-26	-	-	-
A104-27	-	-	-
A104-28 (GND1) - Body ground	No. 1 skid control ECU (Brake booster with master cylinder assembly) ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω
A104-29 (M+)	Brake booster with accumulator pump assembly power supply (+)	-	-
A104-30 (M-)	Brake booster with accumulator pump assembly power supply (-)	-	-
A104-31 (IG1) - Body ground	IG1 power source input	Ignition switch ON	11 to 14 V
A104-32	-	-	-
A104-33	-	-	-
A104-34	-	-	-
A104-35 (CA2H)	CAN communication line 2 (H)	-	-
A104-36 (CA2L)	CAN communication line 2 (L)	-	-
A104-37 (STP) - Body ground	Stop light switch assembly input	Stop light switch assembly on → off (Brake pedal depressed → released)	11 to 14 V → Below 1.5 V
A104-38 (CA1H)	CAN communication line 1 (H)	-	-
A104-39 (CA1L)	CAN communication line 1 (L)	-	-
A104-40 (CTY) - Body ground	Front door courtesy light switch assembly input (for driver side)	Driver door closed → open	11 to 14 V → Below 1.5 V
A104-41	-	-	-
A104-42 (IG2) - Body ground	IG2 power source input	Ignition switch ON	11 to 14 V

CHECK BRAKE ACTUATOR ASSEMBLY

Disconnect the A105 No. 2 skid control ECU (brake actuator assembly) connector and measure the voltage or resistance on the wire harness side.

Front view of wire harness connector
(to No. 2 Skid Control ECU (brake actuator assembly))

HINT:

The voltage cannot be measured with the connector connected to the No. 2 skid control ECU (brake actuator assembly) as the connector is watertight.

STANDARD

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
A105-1 (GND1) - Body ground	No. 2 skid control ECU (brake actuator assembly) ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω
A105-2	-	-	-
A105-3	-	-	-
A105-4 (RL-)	Rear skid control sensor LH (-) signal input	-	-
A105-5 (RL+)	Rear skid control sensor LH (+) power supply output	-	-
A105-6 (FR-)	Front speed sensor RH (-) signal input	-	-
A105-7 (FR+)	Front speed sensor RH (+) power supply output	-	-
A105-8	-	-	-
A105-9 (CSW) - Body ground	VSC OFF switch input	VSC OFF switch is pushed → released	Below 1 Ω → 10 kΩ or higher
A105-10 (SKS2)	Brake pedal stroke sensor 2 signal input	-	-
A105-11 (STP) - Body ground	Stop light switch assembly input	Stop light switch assembly on → off (Brake pedal depressed → released)	11 to 14 V → Below 1.5 V
A105-12	-	-	-
A105-13	-	-	-
A105-14 (+BS) - Body ground	ABS solenoid relay power supply input	Always	11 to 14 V
A105-15 (IG2) - Body ground	IG2 power source input	Ignition switch ON	11 to 14 V
A105-16 (CA2H)	CAN communication line 2 (H)	-	-
A105-17 (CA2L)	CAN communication line 2 (L)	-	-
A105-18 (SP1)	Speed sensor signal output	-	-
A105-19 (RR-)	Rear skid control sensor RH (-) signal input	-	-
A105-20 (RR+)	Rear skid control sensor RH (+) power supply output	-	-
A105-21 (FL-)	Front speed sensor LH (-) signal input	-	-
A105-22 (FL+)	Front speed sensor LH (+) power supply output	-	-
A105-23	-	-	-
A105-24	-	-	-
A105-25 (VSK2)	Brake pedal stroke sensor 2 power supply output	-	-
A105-26 (SKG2)	Brake pedal stroke sensor 2 ground	-	-
A105-27 (CANH)	CAN communication line (H)	-	-
A105-28	-	-	-
A105-29 (CTY) - Body ground	No. 2 Skid control ECU (brake actuator assembly) operation signal input	Ignition switch ON	11 to 14 V
A105-30 (GND2) - Body ground	ABS motor ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω
A105-31	-	-	-
A105-32 (STPO) - Body ground	Stop light control relay (Stop light switch assembly) output	Always	11 to 14 V
A105-33	-	-	-
A105-34	-	-	-
A105-35 (BH) - Body ground	Brake hold switch (integration control and panel assembly) input	Brake hold switch (integration control and panel assembly) is pushed → released	Below 1 Ω → 10 kΩ or higher
A105-36	-	-	-
A105-37 (STP2) - Body ground	Stop light control relay (Stop light switch assembly) input	Stop light switch assembly on → off (Brake pedal depressed → released)	11 to 14 V → Below 1.5 V
A105-38	-	-	-
A105-39	-	-	-
A105-40	-	-	-
A105-41	-	-	-
A105-42	-	-	-
A105-43 (CANL)	CAN communication line (L)	-	-
A105-44	-	-	-
A105-45 (IG1) - Body ground	IG1 power source input	Ignition switch ON	11 to 14 V
A105-46 (BM) - Body ground	ABS motor relay power supply input	Always	11 to 14 V