Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
TERMINALS OF ECU
| *a | Component without harness connected (Skid Control ECU (Brake Booster with Master Cylinder Assembly)) | - | - |
| Terminal No. (Symbol) | Terminal Description |
|---|---|
| 1 (MRO1) | Motor power supply output 1 |
| 2 (MRI1) | Motor power supply input 1 |
| 3 (FR+) | Front speed sensor RH (+) power supply output |
| 4 (FR-) | Front speed sensor RH (-) signal input |
| 5 (+BI2) | +BI2 power source input |
| 6 | - (Not used) |
| 7 (RR+) | Rear speed sensor RH (+) power supply output |
| 8 (RR-) | Rear speed sensor RH (-) signal input |
| 9 (IG2) | IG2 power source input |
| 10 | - (Not used) |
| 11 (SP1) | Speed sensor signal output |
| 12 (STP) | Stop light switch assembly input |
| 13 (SKG1) | Brake pedal stroke sensor assembly ground 1 |
| 14 (+BS) | ABS solenoid drive power output |
| 15 (+BI1) | +BI1 power source input |
| 16 (LBL) | Brake fluid level warning switch (Brake booster with master cylinder assembly) input |
| 17 (SKS1) | Brake pedal stroke sensor assembly signal input 1 |
| 18 (CSW) | VSC OFF switch input |
| 19 (SKS2) | Brake pedal stroke sensor assembly signal input 2 |
| 20 (CSW2) | Brake hold switch (No. 3 combination switch assembly) input |
| 21 (VSK2) | Brake pedal stroke sensor assembly power supply output 2 |
| 22 (STPO) | Stop light control relay (Stop light switch assembly) output |
| 23 (IG1) | IG1 power source input |
| 24 (CTY) | Front door courtesy light switch assembly LH input |
| 25 (VSK1) | Brake pedal stroke sensor assembly power supply output 1 |
| 26 (GND1) | Skid control ECU (Brake booster with master cylinder assembly) ground 1 |
| 27 (MRO2) | Motor power supply output 2 |
| 28 (MRI2) | Motor power supply input 2 |
| 29 (CA2L) | CAN communication line 2 (L) |
| 30 (CA2H) | CAN communication line 2 (H) |
| 31 (FL+) | Front speed sensor LH (+) power supply output |
| 32 (FL-) | Front speed sensor LH (-) signal input |
| 33 (SKG2) | Brake pedal stroke sensor assembly ground 2 |
| 34 (RL+) | Rear speed sensor LH (+) power supply output |
| 35 (RL-) | Rear speed sensor LH (-) signal input |
| 36 | - (Not used) |
| 37 (STP2) | Stop light control relay (Stop light switch assembly) input |
| 38 | - (Not used) |
| 39 (GND2) | Skid control ECU (Brake booster with master cylinder assembly) ground 2 |
| 40 (+BM) | ABS motor drive power output |
| 41 (BM) | ABS motor relay power supply input |
| 42 (CA1L) | CAN communication line 1 (L) |
| 43 (CA1H) | CAN communication line 1 (H) |
| 44 (SFRR) | Front ABS reduction solenoid RH (-) output |
| 45 (SFLR) | Front ABS reduction solenoid LH (-) output |
| 46 (SRRR) | Rear ABS reduction solenoid RH (-) output |
| 47 (SRLR) | Rear ABS reduction solenoid LH (-) output |
| 48 (SFRH) | Front ABS holding solenoid RH (-) output |
| 49 (SFLH) | Front ABS holding solenoid LH (-) output |
| 50 (SRRH) | Rear ABS holding solenoid RH (-) output |
| 51 (SRLH) | Rear ABS holding solenoid LH (-) output |
| 52 (BS) | ABS solenoid relay power supply input |
TERMINAL INSPECTION
(a) Disconnect the connector and measure the voltage or resistance on the wire harness side.
| *a | Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly)) | - | - |
HINT:
The voltage cannot be measured with the connector connected to the skid control ECU (brake booster with master cylinder assembly) as the connector is watertight.
Standard| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A45-2 (MRI1) - Body ground | B - Body ground | Motor power supply input 1 | Always | 11 to 14 V |
| A45-5 (+BI2) - Body ground | BE - Body ground | +BI2 power source input | Always | 11 to 14 V |
| A45-9 (IG2) - Body ground | R - Body ground | IG2 power source input | Power switch on (IG) | 11 to 14 V |
| A45-12 (STP) - Body ground | SB - Body ground | Stop light switch assembly input | Stop light switch assembly on → off (Brake pedal depressed → released) | 11 to 14 V → 1.5 V or less |
| A45-15 (+BI1) - Body ground | SB - Body ground | +BI1 power source input | Always | 11 to 14 V |
| A45-16 (LBL) - Body ground | R - Body ground | Brake fluid level warning switch (Brake booster with master cylinder assembly) input | Brake fluid level warning switch off → on | 1.84 to 2.16 kΩ → Below 1 Ω |
| A45-18 (CSW) - Body ground | P - Body ground | VSC OFF switch input | VSC OFF switch held on → off (Released) | Below 1 Ω → 10 kΩ or higher |
| A45-20 (CSW2) - Body ground | LG - Body ground | Brake hold switch (No. 3 combination switch assembly) input | Brake hold switch (No. 3 combination switch assembly) held on → off (Released) | Below 1 Ω → 10 kΩ or higher |
| A45-22 (STPO) - Body ground | L - Body ground | Stop light control relay (Stop light switch assembly) output | Always | 11 to 14 V |
| A45-23 (IG1) - Body ground | B - Body ground | IG1 power source input | Power switch on (IG) | 11 to 14 V |
| A45-24 (CTY) - Body ground | V - Body ground | Front door courtesy light switch assembly LH input | Driver door closed → open | 11 to 14 V → 1.5 V or less |
| A45-26 (GND1) - Body ground | LA - Body ground | Skid control ECU (Brake booster with master cylinder assembly) ground 1 | Always | Below 1 Ω |
| A45-28 (MRI2) - Body ground | G - Body ground | Motor power supply input 2 | Always | 11 to 14 V |
| A45-37 (STP2) - Body ground | BE - Body ground | Stop light control relay (Stop light switch assembly) input | Stop light switch assembly on → off (Brake pedal depressed → released) | 11 to 14 V → 1.5 V or less |
| A45-39 (GND2) - Body ground | W-B - Body ground | Skid control ECU (Brake booster with master cylinder assembly) ground 2 | Always | Below 1 Ω |
| A45-41 (BM) - Body ground | L - Body ground | ABS motor relay power supply input | Always | 11 to 14 V |
| A45-52 (BS) - Body ground | LG - Body ground | ABS solenoid relay power supply input | Always | 11 to 14 V |
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