Lexus ES manuals

Lexus ES: Terminals Of Ecu

TERMINALS OF ECU

TERMINALS OF ECU

*a

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.

    Click here

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 for speedometer

35

-

36 (IG1)

IG1 power source input

37 (RR-)

Rear wheel speed RH (-) signal input

38 (CSW)

VSC OFF switch input

39 (RL+)

Rear wheel speed LH (+) power supply output

40

-

41 (STP)

Stop light switch assembly signal input

42 (EXI3)

Brake hold switch (No. 3 combination switch assembly) input

43 (STP2)

Stop light signal input

44

-

45

-

46 (GND1)

Skid control ECU (brake actuator assembly) ground

TERMINAL INSPECTION

(a) Disconnect the A40 skid control ECU (brake actuator assembly) connector and measure the voltage and resistance on the wire harness side.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

-

-

(b) 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

A40-1 (+BM) - Body ground

B - Body ground

ABS motor relay power supply

Always

11 to 14 V

A40-14 (GND2) - Body ground

W-B - Body ground

Pump motor ground

Always

Below 1 Ω

A40-30 (+BS) - Body ground

G - Body ground

ABS solenoid relay power supply

Always

11 to 14 V

A40-33 (STPO) - Body ground

L - Body ground

Stop light control relay (stop light switch assembly) output

Always

11 to 14 V

A40-36 (IG1) - Body ground

B - Body ground

IG1 power source input

Engine switch on (IG)

11 to 14 V

A40-38 (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

A40-41 (STP) - Body ground

GR - 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

A40-42 (EXI3) - Body ground

G - Body ground

Brake hold switch (No. 3 combination switch assembly) input

Brake hold switch (No. 3 combination switch assembly) on → off (Pressed → not pressed)

Below 1 Ω → 10 kΩ or higher

A40-43 (STP2) - Body ground

R - 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

A40-46 (GND1) - Body ground

W-B - Body ground

Skid control ECU (brake actuator assembly) ground

Always

Below 1 Ω

READ NEXT:

 Test Mode Procedure

TEST MODE PROCEDURE NOTICE: After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly. Aft

 Test Mode Procedure

TEST MODE PROCEDURE NOTICE: After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly. Aft

 TRAC does not Operate

DESCRIPTION When TRAC or VSC is operating, the skid control ECU (brake actuator assembly) blinks the slip indicator light to inform the driver that slippage occurred. When in VSC off mode, or TRAC and

SEE MORE:

 Brake Switch "A" Circuit Open (P057113)

DESCRIPTION The skid control ECU (brake actuator assembly) receives stop light switch assembly signals and uses them to determine whether or not the brakes are applied. The skid control ECU (brake actuator assembly) has a detection circuit that it uses to detect an open in the stop light input line.

 Removal

REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH side and LH side. The following procedure is for the LH side. PROCEDURE 1. REMOVE LUGGAGE LOCK CONTROL CABLE PLATE Click here 2. REMOVE SWITCH BEZEL (w/ Power Trunk Lid System) Click here 3. REMOVE LUGGAGE COMPARTMEN

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