Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

TERMINALS OF ECU

*a

Component without harness connected

(Skid Control ECU (Brake Actuator Assembly))

-

-

Terminal No. (Symbol)

Terminal Description

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

TERMINAL INSPECTION

(a) Disconnect the A41 connector and measure the voltage or resistance on the wire harness side.

*a

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

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

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