Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Drive Mode Select Switch Circuit

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Steering / Power Assist Systems / Power Steering System / Drive Mode Select Switch Circuit

DESCRIPTION

The electronic throttle and the EPS character change by the operation of the drive mode select switch (combination switch assembly).

WIRING DIAGRAM

PROCEDURE

1.

CHECK THE PROBLEM SYMPTOMS

(a) Check each symptom by checking the suspected areas in the table below.

Result

Proceed to

SPORT, SPORT S/S+ mode or NORMAL mode is abnormal.

A

ECO mode is abnormal.

B
B

GO TO AIR CONDITIONING SYSTEM

A

2.

CHECK CAN COMMUNICATION SYSTEM

(a) Check for DTCs.

Click here

Result

Proceed to

CAN communication system DTCs are not output.

A

CAN communication system DTCs are output.

B
B

GO TO CAN COMMUNICATION SYSTEM

A

3.

CHECK HARNESS AND CONNECTOR (DRIVE MODE SELECT SWITCH (COMBINATION SWITCH ASSEMBLY) - BODY GROUND)

(a) Turn the engine switch off.

(b) Disconnect the J35 drive mode select switch (combination switch assembly) connector.

*a

Front view of wire harness connector

(to Drive mode select switch (combination switch assembly))

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

J35-1 (GND) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT DRIVE MODE SELECT SWITCH (COMBINATION SWITCH ASSEMBLY)

(a) Inspect drive mode select switch (combination switch assembly).

for U881E: Click here

for U881F: Click here

OK:

Drive mode select switch (combination switch assembly) is normal.

NG

REPLACE DRIVE MODE SELECT SWITCH (COMBINATION SWITCH ASSEMBLY)

OK

5.

CHECK HARNESS AND CONNECTOR (DRIVE MODE SELECT SWITCH (COMBINATION SWITCH ASSEMBLY) - ECM)

(a) Reconnect the J35 drive mode select switch (combination switch assembly) connector.

(b) Disconnect the A37 ECM connectors.

*a

Rear view of wire harness connector

(to ECM)

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A37-55 (PWMS) - Body ground

SPORT mode switch being turned and held

Below 50 Ω

A37-55 (PWMS) - Body ground

SPORT mode switch not turned

10 kΩ or higher

A37-40 (SPCN) - Body ground

NORMAL mode switch being pushed and held

Below 50 Ω

A37-40 (SPCN) - Body ground

NORMAL mode switch not pushed

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Diagnostic Trouble Code Chart
    DIAGNOSTIC TROUBLE CODE CHART Power Steering System DTC No. Detection Item DTC Detection Condition Warning Indicate Return-to-normal Condition Note Link C1511 Torque Sensor1 Tor ...

    Dtc Check / Clear
    DTC CHECK / CLEAR CHECK DTCs (USING TECHSTREAM) (a) Turn the engine switch off. (b) Connect the Techstream to the DLC3. (c) Turn the engine switch on (IG). (d) Turn the Techstream on. (e) Enter the fo ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Vehicle Stability Control System: Brake System Control Module "A" System Voltage System Voltage Low (C137BA2)
    DESCRIPTION If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation. This DTC is stored when the +BS terminal voltage meets one of the DTC detection conditions due to a malfunction in ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Lumbar Support Adjuster Assembly: Components
    COMPONENTS ILLUSTRATION *A for Standard Seat Type *B for Sports Seat Type *1 FRONT SEAT CUSHION SHIELD *2 FRONT SEAT INNER CUSHION SHIELD *3 INNER NO. 1 FRONT SEAT CUSHION SHIELD - - ILLUSTRATION *1 SEPARATE TYPE FRONT SEATBACK ASSEMBLY *2 SEPARATE TYPE FRO ...

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

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

    © 2025 Copyright www.lexusrx.net
    0.0166