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.
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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 |
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