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.

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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