Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Terminals Of Ecu

*a

Component without harness connected

(Skid Control ECU (Brake Actuator Assembly))

-

-

1 (GND1)

Skid control ECU (brake actuator assembly) ground

2

-

3

-

4 (RL-)

Rear wheel speed LH (-) signal input

5 (RL+)

Rear wheel speed LH (+) power supply output

6 (FR-)

Front wheel speed RH (-) signal input

7 (FR+)

Front wheel speed RH (+) power supply output

8

-

9 (CSW)

VSC OFF switch (combination switch assembly) input

10

-

11 (STP)

Stop light switch assembly input

12

-

13

-

14 (+BS)

Solenoid relay power supply

15

-

16

-

17

-

18 (SP1)

Speed signal output for speedometer

19 (RR-)

Rear wheel speed RH (-) signal input

20 (RR+)

Rear wheel speed RH (+) power supply output

21 (FL-)

Front wheel speed LH (-) signal input

22 (FL+)

Front wheel speed LH (+) power supply output

23

-

24

-

25

-

26

-

27 (CANH)

CAN communication line H

28 (FSW+)

Brake pedal load sensing switch (brake pedal support assembly) input

29

-

30 (GND2)

Pump motor ground

31

-

32 (STPO)

Stop light control relay output

33

-

34

-

35 (PKB)

Brake hold switch (electric parking brake switch assembly) input

36

-

37 (STP2)

Stop light signal input

38

-

39

-

40

-

41

-

42

-

43 (CANL)

CAN communication line L

44

-

45 (IG1)

ECU power supply input

46 (BM)

Motor relay power supply

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

-

-

A41-1 (GND1) - Body ground

W-B - Body ground

Skid control ECU (brake actuator assembly) ground

1 minute or more after disconnecting the cable from the negative (-) battery terminal

Below 1 Ω

A41-9 (CSW) - Body ground

P - Body ground

VSC OFF switch (combination switch assembly) input

VSC OFF switch (combination switch assembly) pressed and held → released

Below 1 Ω → 10 kΩ or higher

A41-11 (STP) - Body ground

B - 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

A41-14 (+BS) - Body ground

L - Body ground

Solenoid relay power supply

Always

11 to 14 V

A41-18 (SP1) - Body ground

BE - Body ground

Speed signal output for speedometer

Engine switch on (IG)

11 to 14 V

A41-28 (FSW+) - Body ground

W - Body ground

Brake pedal load sensing switch (brake pedal support assembly) input

Brake pedal depressed → released

950 to 1050 Ω → 203 to 223 Ω

A41-30 (GND2) - Body ground

W-B - Body ground

Pump motor ground

1 minute or more after disconnecting the cable from the negative (-) battery terminal

Below 1 Ω

A41-32 (STPO) - Body ground

B - Body ground

Semiconductor PWR integration ECU output

Engine switch on (IG)

11 to 14 V

A41-35 (PKB) - Body ground

R - Body ground

Brake hold switch (electric parking brake switch assembly) input

Brake hold switch (electric parking brake switch assembly) pressed and held → released

Below 1 Ω → 10 kΩ or higher

A41-37 (STP2) - Body ground

P - Body ground

Stop light signal input

Brake pedal depressed → released

8 to 14 V → Below 1.5 V

A41-45 (IG1) - Body ground

V - Body ground

ECU power supply input

Engine switch on (IG)

11 to 14 V

A41-46 (BM) - Body ground

R - Body ground

Motor relay power supply

Always

11 to 14 V