Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: 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 | .gif) | GO TO AIR CONDITIONING SYSTEM |
|
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| 2. | CHECK CAN COMMUNICATION SYSTEM |
(a) Check for DTCs.
Click here .gif)
| Result | Proceed to |
|---|---|
| CAN communication system DTCs are not output. | A |
| CAN communication system DTCs are output. | B |
| B | | GO TO CAN COMMUNICATION SYSTEM |
|
| 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. |
|
(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 |
|
| 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) |
|
| 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. |
|
(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
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Dtc Check / Clear
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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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