Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Terminals Of Ecu
TERMINALS OF ECU
CHECK WINDSHIELD WIPER MOTOR ASSEMBLY
(a) Disconnect the i1 windshield wiper motor assembly connector.
(b) Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| i1-3 (L) - Body ground | B - Body ground | Engine switch on (IG) signal (Power source circuit) | Engine switch on (IG) | 11 to 14 V |
| Engine switch off | Below 1 V | |||
| i1-4 (+S) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the i1 windshield wiper motor assembly connector.
(d) Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| i1-1 (2S) - Body ground | B - Body ground | Windshield wiper motor assembly HI operation signal | Windshield wiper motor assembly stopped | 11 to 14 V |
| Windshield wiper motor assembly operating in HI | Below 1 V | |||
| i1-2 (MPX1) - Body ground | GR - Body ground | LIN communication signal | Engine switch on (IG) | Pulse generation |
HINT:
If the result is not as specified, there may be a malfunction in the wire harness.
CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for Triple Beam Headlight, for Single Beam Headlight with AFS (Adaptive Front-lighting System))
(a) Measure the voltage according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A50-7 (HLC) - Body ground | B - Body ground | Headlight cleaner operation signal | Engine switch on (IG), headlight cleaner not operating | 11 to 14 V |
| Engine switch on (IG), headlight cleaner operating | Below 1 V | |||
| A50-18 (FRWA) - Body ground | B - Body ground | Washer switch operation signal | Engine switch on (IG), washer switch off | 11 to 14 V |
| Engine switch on (IG), washer switch on | Below 1 V |
HINT:
Since the A50 headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for Single Beam Headlight without AFS (Adaptive Front-lighting System))
(a) Measure the voltage according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A50-7 (HLC) - Body ground | B - Body ground | Headlight cleaner operation signal | Engine switch on (IG), headlight cleaner not operating | 11 to 14 V |
| Engine switch on (IG), headlight cleaner operating | Below 1 V | |||
| A50-18 (FRWA) - Body ground | B - Body ground | Washer switch operation signal | Engine switch on (IG), washer switch off | 11 to 14 V |
| Engine switch on (IG), washer switch on | Below 1 V |
HINT:
Since the A50 headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
Problem Symptoms Table
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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