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
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| 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:
Components
COMPONENTS ILLUSTRATION *A for 2WD - - *1 REAR SUSPENSION MEMBER SUB-ASSEMBLY *2 REAR UPPER CONTROL ARM ASSEMBLY LH *3 REAR UPPER CONTROL ARM ASSEMBLY RH - - Tightening torque for "Major areas involving basic vehicle performance such as moving/turning/stopping":
Malfunction in Front Speed Sensor RH Circuit (C1401,C1402)
DESCRIPTION Refer to DTCs C1413 and C1414. Click here DTC No. Detection Item INF Code DTC Detection Condition Trouble Area MIL Note C1401 Malfunction in Front Speed Sensor RH Circuit 501 502 507
INF Code: 501
At a vehicle speed of 10 km/h (6 mph) or more, output volt
