WIPER AND WASHER SYSTEM - TERMINALS OF ECU
| CHECK ENGINE ROOM NO. 2 J/B (FRONT CONTROLLER) |
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| FMIG (2E-3) - E (2F-1) | B-Y - W-B | IG signal circuit (to IG relay) | Engine switch off | Below 1 V |
| Engine switch on (IG) | 10 to 14 V |
| FMB3 (2E-4) - E (2F-1) | G-R - W-B | Power source circuit (from battery) | Always | 10 to 14 V |
| E (2F-1) - Body ground | W-B - Body ground | Ground circuit | Always | Below 1 V |
| W+ (2F-4) - E (2F-1) | L - W-B | Windshield washer motor circuit | Windshield washer motor OFF | Below 1 V |
| Windshield washer motor ON | 10 to 14 V |
| MPX1 (2F-5) - E (2F-1) | L - W-B | Multiplex communication signal circuit | Engine switch on (IG) | Signal waveform |
| MPX2 (2F-6) - E (2F-1) | GR - W-B | Multiplex communication signal circuit | Engine switch on (IG) | Signal waveform |
| FRWA (2F-8) - E (2F-1) | L-O - W-B | Headlight cleaner operation signal | Windshield washer motor OFF | 4.5 to 5.5 V |
| Windshield washer motor ON | Below 1 V |
| WLVL (2F-7) - E (2F-1) | V - W-B | Washer fluid level sensor signal | Washer fluid level is normal | 10 to 14 V |
| Washer fluid is empty | Below 1 V |
| CHECK MAIN BODY ECU RH (COWL SIDE J/B RH) |
*1: A/T
*2: M/T
*3: with Power Tilt and Power Telescopic
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| MPX1 (RA-20) - GND2 (RD-7) | GR - W-B (*3) | Multiplex communication signal circuit | Engine switch on (IG) | Signal waveform |
| GND2 (RD-7) - Body ground | W-B - Body ground | Ground circuit | Always | Below 1 V |
| MPX1 (RJ-21) - GND2 (RD-7) | GR - W-B | Multiplex communication signal circuit | Engine switch on (IG) | Signal waveform |
| BECU (RK-5) - GND2 (RD-7) | G-R - W-B | ECU power supply (from battery) | Always | 10 to 14 V |
PKB (RL-9) - GND2 (RD-7) (*1)
PKB (RA-12) - GND2 (RD-7) (*2) | Y-B - W-B(*1)
Y - W-B(*2) | Parking brake switch circuit | Parking brake pedal is depressed | Below 1 V |
| Parking brake pedal is released | 10 to 14 V |
| HDLO (A36-4) - GND2 (RD-7) | R - W-B | Headlight signal (to headlight cleaner relay) | Headlight switch is OFF | 10 to 14 V |
| Headlight switch is LOW | Below 1 V |
| MPX2 (J75-21) - GND2 (RD-7) | GR - W-B | Multiplex communication signal circuit | Engine switch on (IG) | Signal waveform |
| CHECK MAIN BODY ECU LH (COWL SIDE J/B LH) |
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| GND (LD-3) - Body ground | W-B - Body ground | Ground circuit | Always | Below 1 V |
| SGND (LD-8) - Body ground | W-B - Body ground | Signal ground circuit | Always | Below 1 V |
| SGND (LD-9) - Body ground | W-B - Body ground | Signal ground circuit | Always | Below 1 V |
| WIG (LK-9) - GND (LD-3) | L - W-B | Front wiper motor power source circuit | Engine switch off | Below 1 V |
| Engine switch on (IG) | 10 to 14 V |
| MPXB (LD-18) - GND (LD-3) | LG - W-B | ECU power supply (from battery) | Always | 10 to 14 V |
| IG (LM-1) - GND (LD-3) | W - W-B | Power source circuit (from battery) | Always | 10 to 14 V |
| S/S (A30-1) - GND (LD-3) | Y - W-B | Front wiper motor power supply circuit (LOW signal) | Front wiper switch OFF | Below 1 V |
| Front wiper switch LOW | 10 to 14 V |
| +2 (A30-2) - GND (LD-3) | R-L - W-B | Front wiper motor power supply circuit (HI signal) | Front wiper switch OFF | Below 1 V |
| Front wiper switch HI | 10 to 14 V |
| S/M (A30-3) - GND (LD-3) | G - W-B | Front wiper motor operation signal | Front wiper is operated | 10 to 14 V |
| Front wiper is stopped | Below 1 V |
| MPX2 (A30-17) - GND (LD-3) | GR - W-B | Multiplex communication signal circuit | Engine switch on (IG) | Signal waveform |
| 2S (Q2-11) - GND (LD-3) | B - W-B | Front wiper switch HI signal (to combination switch) | Front wiper switch OFF | 10 to 14 V |
| Front wiper switch HI | Below 1 V |
| MPX1 (Q3-15) - GND (LD-3) | GR - W-B | Multiplex communication signal circuit | Engine switch on (IG) | Signal waveform |
| CHECK WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH ECU) |
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| B (J26-1) - E (J26-5) | LG - W-B | Power source circuit (from battery) | Always | 10 to 14 V |
| IG (J26-2) - E (J26-5) | B - W-B | IG signal circuit (to IG relay) | Engine switch off | Below 1 V |
| Engine switch on (IG) | 10 to 14 V |
| 2S (J26-3) - E (J26-5) | G - W-B | Wiper switch HI signal | Front wiper switch OFF | Below 1 V |
| Front wiper switch HI | 10 to 14 V |
| E (J26-5) - Body ground | W-B - Body ground | Ground circuit | Always | Below 1 V |
| MPX1 (J26-6) - E (J26-5) | GR - W-B | Multiplex communication signal circuit | Engine switch on (IG) | Signal waveform |
| MPX2 (J26-7) - E (J26-5) | GR - W-B | Multiplex communication signal circuit | Engine switch on (IG) | Signal waveform |
| CHECK HEADLIGHT CLEANER CONTROL RELAY |
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
| IG (A3-3) - E (A3-4) | Y - W-B | Engine switch on (IG) signal (Power source circuit) | Engine switch off | Below 1 V |
| IG (A3-3) - E (A3-4) | Y - W-B | Engine switch on (IG) signal (Power source circuit) | Engine switch on (IG) | 10 to 14 V |
| PB (A3-6) - E (A3-4) | W-G - W-B | Headlight cleaner motor operation signal | Headlight cleaner motor is stopped | Below 1 V |
| PB (A3-6) - E (A3-4) | W-G - W-B | Headlight cleaner motor operation signal | Headlight cleaner motor is operating | 10 to 14 V |
| HDLO (A3-1) - E (A3-4) | R - W-B | Daytime running light system operation signal | Daytime running light is not operating | Below 1 V |
| HDLO (A3-1) - E (A3-4) | R - W-B | Daytime running light system operation signal | Daytime running light is operating | 10 to 14 V |
| H (A3-2) - E (A3-4) | R-G - W-B | Headlight cleaner switch operation signal | Headlight cleaner switch is OFF | Below 1 V |
| H (A3-2) - E (A3-4) | R-G - W-B | Headlight cleaner switch operation signal | Headlight cleaner switch is ON | 10 to 14 V |
| E (A3-4) - Body ground | W-B - Body ground | Body ground | Always | Below 1 V |
| FRWA (A3-5) - E (A3-4) | L-O - W-B | Front washer motor operation signal | Front washer switch is OFF | Below 1 V |
| FRWA (A3-5) - E (A3 -4) | L-O - W-B | Front washer motor operation signal | Front washer switch is ON | 10 to 14 V |
LEXUS IS250, IS220d / GSE20 ALE20