Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Fold Seat Switch Circuit
DESCRIPTION
When a switch of the fold seat switch assembly or No. 1 fold seat switch assembly is pushed, the fold seat control ECU receives a switch operation signal and operates the fold or return function.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When a fold seat control ECU (RH/LH seat) is replaced, it is necessary to perform initialization.
Click here .gif)
PROCEDURE
| 1. | CHECK REAR POWER SEAT CONTROL SYSTEM (for Third Row) |
(a) Check that the rear power seat control system (for Third Row) function operates normally.
| Result | Proceed to | |
|---|---|---|
| When fold seat switch assembly operated | Fold/Return functions of both rear No.2 power seats do not operate normally. | A |
| Fold function of rear No. 2 power seat RH does not operate normally. | B | |
| Return function of rear No. 2 power seat RH does not operate normally. | C | |
| Fold function of rear No. 2 power seat LH does not operate normally. | D | |
| Return function of rear No. 2 power seat LH does not operate normally. | E | |
| When No. 1 fold seat switch assembly operated | Fold/Return functions of both rear No.2 power seats do not operate normally. | F |
| Fold function of rear No. 2 power seat RH does not operate normally. | G | |
| Return function of rear No. 2 power seat RH does not operate normally. | H | |
| Fold function of rear No. 2 power seat LH does not operate normally. | I | |
| Return function of rear No. 2 power seat LH does not operate normally. | J | |
| B | .gif) | GO TO STEP 4 |
| C | | GO TO STEP 7 |
| D | | GO TO STEP 10 |
| E | | GO TO STEP 13 |
| F | | GO TO STEP 16 |
| G | | GO TO STEP 18 |
| H | | GO TO STEP 21 |
| I | | GO TO STEP 24 |
| J | | GO TO STEP 27 |
|
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| 2. | INSPECT FOLD SEAT SWITCH ASSEMBLY (GROUND) |
(a) Remove the fold seat switch assembly.
Click here
(b) Inspect the fold seat switch assembly. (Ground)
Click here
| NG | | REPLACE FOLD SEAT SWITCH ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (FOLD SEAT SWITCH ASSEMBLY - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| R54-7 (E) - Body ground | Always | Below 1 Ω |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 4. | INSPECT FOLD SEAT SWITCH ASSEMBLY (FOLD SWITCH (RH)) |
(a) Remove the fold seat switch assembly.
Click here
(b) Inspect the fold seat switch assembly. (Fold Switch (RH))
Click here
| NG | | REPLACE FOLD SEAT SWITCH ASSEMBLY |
|
| 5. | CHECK FOLD SEAT CONTROL ECU (RH SEAT) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| R54-8 (FLDR) - Body ground | Always | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 6. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (RH SEAT) - FOLD SEAT SWITCH ASSEMBLY) |
(a) Disconnect the x15 fold seat control ECU (RH seat) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| x15-26 (RCLF) - R54-8 (FLDR) | Always | Below 1 Ω |
| x15-26 (RCLF) or R54-8 (FLDR) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (RH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 7. | INSPECT FOLD SEAT SWITCH ASSEMBLY (RETURN SWITCH (RH)) |
(a) Remove the fold seat switch assembly.
Click here
(b) Inspect the fold seat switch assembly. (Return Switch (RH))
Click here
| NG | | REPLACE FOLD SEAT SWITCH ASSEMBLY |
|
| 8. | CHECK FOLD SEAT CONTROL ECU (RH SEAT) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| R54-3 (RTNR) - Body ground | Always | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 9. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (RH SEAT) - FOLD SEAT SWITCH ASSEMBLY) |
(a) Disconnect the x15 fold seat control ECU (RH seat) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| x15-25 (RCLR) - R54-3 (RTNR) | Always | Below 1 Ω |
| x15-25 (RCLR) or R54-3 (RTNR) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (RH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 10. | INSPECT FOLD SEAT SWITCH ASSEMBLY (FOLD SWITCH (LH)) |
(a) Remove the fold seat switch assembly.
Click here
(b) Inspect the fold seat switch assembly. (Fold Switch (LH))
Click here
| NG | | REPLACE FOLD SEAT SWITCH ASSEMBLY |
|
| 11. | CHECK FOLD SEAT CONTROL ECU (LH SEAT) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| R54-6 (FLDL) - Body ground | Always | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 12. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (LH SEAT) - FOLD SEAT SWITCH ASSEMBLY) |
(a) Disconnect the y15 fold seat control ECU (LH seat) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| y15-26 (RCLF) - R54-6 (FLDL) | Always | Below 1 Ω |
| y15-26 (RCLF) or R54-6 (FLDL) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (LH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 13. | INSPECT FOLD SEAT SWITCH ASSEMBLY (RETURN SWITCH (LH)) |
(a) Remove the fold seat switch assembly.
Click here
(b) Inspect the fold seat switch assembly. (Return Switch (LH))
Click here
| NG | | REPLACE FOLD SEAT SWITCH ASSEMBLY |
|
| 14. | CHECK FOLD SEAT CONTROL ECU (LH SEAT) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| R54-1 (RTNL) - Body ground | Always | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 15. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (LH SEAT) - FOLD SEAT SWITCH ASSEMBLY) |
(a) Disconnect the y15 fold seat control ECU (LH seat) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| y15-25 (RCLR) - R54-1 (RTNL) | Always | Below 1 Ω |
| y15-25 (RCLR) or R54-1 (RTNL) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (LH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 16. | INSPECT NO. 1 FOLD SEAT SWITCH ASSEMBLY (GROUND) |
(a) Remove the No. 1 fold seat switch assembly.
Click here
(b) Inspect the No. 1 fold seat switch assembly. (Ground)
Click here
| NG | | REPLACE NO. 1 FOLD SEAT SWITCH ASSEMBLY |
|
| 17. | CHECK HARNESS AND CONNECTOR (NO. 1 FOLD SEAT SWITCH ASSEMBLY - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| S88-7 (E) - Body ground | Always | Below 1 Ω |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 18. | INSPECT NO. 1 FOLD SEAT SWITCH ASSEMBLY (FOLD SWITCH (RH)) |
(a) Remove the No. 1 fold seat switch assembly.
Click here
(b) Inspect the No. 1 fold seat switch assembly. (Fold Switch (RH))
Click here
| NG | | REPLACE NO. 1 FOLD SEAT SWITCH ASSEMBLY |
|
| 19. | CHECK FOLD SEAT CONTROL ECU (RH SEAT) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| S88-6 (FOLD) - Body ground | Always | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 20. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (RH SEAT) - NO. 1 FOLD SEAT SWITCH ASSEMBLY) |
(a) Disconnect the x15 fold seat control ECU (RH seat) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| x15-12 (FOLD) - S88-6 (FOLD) | Always | Below 1 Ω |
| x15-12 (FOLD) or S88-6 (FOLD) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (RH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 21. | INSPECT NO. 1 FOLD SEAT SWITCH ASSEMBLY (RETURN SWITCH (RH)) |
(a) Remove the No. 1 fold seat switch assembly.
Click here
(b) Inspect the No. 1 fold seat switch assembly. (Return Switch (RH))
Click here
| NG | | REPLACE NO. 1 FOLD SEAT SWITCH ASSEMBLY |
|
| 22. | CHECK FOLD SEAT CONTROL ECU (RH SEAT) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| S88-1 (RTRN) - Body ground | Always | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 23. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (RH SEAT) - NO. 1 FOLD SEAT SWITCH ASSEMBLY) |
(a) Disconnect the x15 fold seat control ECU (RH seat) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| x15-7 (RTRN) - S88-1 (RTRN) | Always | Below 1 Ω |
| x15-7 (RTRN) or S88-1 (RTRN) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (RH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 24. | INSPECT NO. 1 FOLD SEAT SWITCH ASSEMBLY (FOLD SWITCH (LH)) |
(a) Remove the No. 1 fold seat switch assembly.
Click here
(b) Inspect the No. 1 fold seat switch assembly. (Fold Switch (LH))
Click here
| NG | | REPLACE NO. 1 FOLD SEAT SWITCH ASSEMBLY |
|
| 25. | CHECK FOLD SEAT CONTROL ECU (LH SEAT) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| S88-8 (FOLD) - Body ground | Engine switch off | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 26. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (LH SEAT) - NO. 1 FOLD SEAT SWITCH ASSEMBLY) |
(a) Disconnect the y15 fold seat control ECU (LH seat) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| y15-12 (FOLD) - S88-8 (FOLD) | Always | Below 1 Ω |
| y15-12 (FOLD) or S88-8 (FOLD) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (LH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 27. | INSPECT NO. 1 FOLD SEAT SWITCH ASSEMBLY (RETURN SWITCH (LH)) |
(a) Remove the No. 1 fold seat switch assembly.
Click here
(b) Inspect the No. 1 fold seat switch assembly. (Return Switch (LH))
Click here
| NG | | REPLACE NO. 1 FOLD SEAT SWITCH ASSEMBLY |
|
| 28. | CHECK FOLD SEAT CONTROL ECU (LH SEAT) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| S88-3 (RTRN) - Body ground | Always | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 29. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (LH SEAT) - NO. 1 FOLD SEAT SWITCH ASSEMBLY) |
(a) Disconnect the y15 fold seat control ECU (LH seat) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| y15-7 (RTRN) - S88-3 (RTRN) | Always | Below 1 Ω |
| y15-7 (RTRN) or S88-3 (RTRN) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (LH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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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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