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

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Suspension / 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
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