Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual: Terminals Of Ecu



(a) Measure the voltage and resistance of the connector.

Terminal No. (Symbol)

Wiring Color

Terminal Description


Specified Condition

R10-10 (4WDS) - R10-4 (GND)

P - W-B

AWD lock mode switch signal

Engine switch on (IG)

AWD lock mode switch released → pressed and held

11 to 14 V → Below 1 V

R10-6 (CANH) - R10-5 (CANL)

B - W

HIGH-level CAN bus wire - LOW-level CAN bus wire

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

R10-4 (GND) - Body ground

W-B - Body ground



Below 1 Ω

R10-3 (IG1) - R10-4 (GND)

B - W-B

Power source voltage

Engine switch on (IG)

11 to 14 V

R10-2 (SLC+) - R10-1 (SLC-)

L - B

4WD linear solenoid signal

Shift lever in D, engine idling

Pulse generation (See waveform 1)

If the result is not as specified, the 4WD ECU assembly may have a malfunction.

(b) Using an oscilloscope, check the waveform 1.

Waveform 1 (Reference)



Terminal No. (Symbol)

R10-2 (SLC+) - R10-1 (SLC-)

Tester Range

2 V/DIV., 1 msec./DIV.


Shift lever in D, engine idling

    Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION Dynamic torque control AWD system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be ...

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    DTC CHECK / CLEAR CHECK DTC (a) Check for DTCs. (1) Connect the Techstream to the DLC3. (2) Turn the engine switch on (IG). (3) Turn the Techstream on. (4) Read the DTCs following the prompts on the T ...

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