Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Power Seat Motor 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 each motor.
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
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-
When No. 2 seat cushion frame sub-assembly RH, No. 2 seat cushion frame sub-assembly LH, No. 2 seatback frame sub-assembly RH or No. 2 seatback frame sub-assembly LH is removed and reinstalled, it is necessary to perform initialization.
Click here
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 |
|---|---|
| Lifter motor (RH) does not operate normally. | A |
| Reclining motor (RH) does not operate normally. | B |
| Lifter motor (LH) does not operate normally. | C |
| Reclining motor (LH) does not operate normally. | D |
| B | .gif) | GO TO STEP 5 |
| C | | GO TO STEP 8 |
| D | | GO TO STEP 11 |
|
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| 2. | INSPECT NO. 2 SEAT CUSHION FRAME SUB-ASSEMBLY RH (LIFTER MOTOR) |
(a) Remove the No. 2 seat cushion frame sub-assembly RH.
Click here
(b) Inspect the No. 2 seat cushion frame sub-assembly RH. (Lifter Motor)
Click here
| NG | | REPLACE NO. 2 SEAT CUSHION FRAME SUB-ASSEMBLY RH |
|
| 3. | 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 |
|---|---|---|
| x13-4 - Body ground | Fold switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly pushed | 11 to 14 V |
| x13-3 - Body ground | Return switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly pushed | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 4. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (RH SEAT) - NO. 2 SEAT CUSHION FRAME SUB-ASSEMBLY RH) |
(a) Disconnect the x16 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 |
|---|---|---|
| x16-4 (FLD+) - x13-4 | Always | Below 1 Ω |
| x16-4 (FLD+) or x13-4 - Body ground | Always | 10 kΩ or higher |
| x16-8 (FLD-) - x13-3 | Always | Below 1 Ω |
| x16-8 (FLD-) or x13-3 - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (RH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 5. | INSPECT NO. 2 SEAT BACKFRAME SUB-ASSEMBLY RH (RECLINING MOTOR) |
(a) Remove the No. 2 seatback frame sub-assembly RH.
Click here
(b) Inspect the No. 2 seatback frame sub-assembly RH. (Reclining Motor)
Click here
| NG | | REPLACE NO. 2 SEATBACK FRAME SUB-ASSEMBLY RH |
|
| 6. | 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 |
|---|---|---|
| x14-3 - Body ground | Fold switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly pushed | 11 to 14 V |
| x14-4 - Body ground | Return switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly pushed | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 7. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (RH SEAT) - NO. 2 SEATBACK FRAME SUB-ASSEMBLY RH) |
(a) Disconnect the x16 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 |
|---|---|---|
| x16-3 (RCL+) - x14-3 | Always | Below 1 Ω |
| x16-3 (RCL+) or x14-3 - Body ground | Always | 10 kΩ or higher |
| x16-7 (RCL-) - x14-4 | Always | Below 1 Ω |
| x16-7 (RCL-) or x14-4 - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (RH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 8. | INSPECT NO. 2 SEAT CUSHION FRAME SUB-ASSEMBLY LH (LIFTER MOTOR) |
(a) Remove the No. 2 seat cushion frame sub-assembly LH.
Click here
(b) Inspect the No. 2 seat cushion frame sub-assembly LH. (Lifter Motor)
Click here
| NG | | REPLACE NO. 2 SEAT CUSHION FRAME SUB-ASSEMBLY LH |
|
| 9. | 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 |
|---|---|---|
| y13-4 - Body ground | Fold switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly pushed | 11 to 14 V |
| y13-3 - Body ground | Return switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly pushed | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 10. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (LH SEAT) - NO. 2 SEAT CUSHION FRAME SUB-ASSEMBLY LH) |
(a) Disconnect the y16 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 |
|---|---|---|
| y16-4 (FLD+) - y13-4 | Always | Below 1 Ω |
| y16-4 (FLD+) or y13-4 - Body ground | Always | 10 kΩ or higher |
| y16-8 (FLD-) - y13-3 | Always | Below 1 Ω |
| y16-8 (FLD-) or y13-3 - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (LH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 11. | INSPECT NO.2 SEATBACK FRAME SUB-ASSEMBLY LH (RECLINING MOTOR) |
(a) Remove the No. 2 seatback frame sub-assembly LH.
Click here
(b) Inspect the No. 2 seatback frame sub-assembly LH. (Reclining Motor)
Click here
| NG | | REPLACE NO.2 SEATBACK FRAME SUB-ASSEMBLY LH |
|
| 12. | 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 |
|---|---|---|
| y14-3 - Body ground | Fold switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly pushed | 11 to 14 V |
| y14-4 - Body ground | Return switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly pushed | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 13. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (LH SEAT) - NO. 2 SEATBACK FRAME SUB-ASSEMBLY LH) |
(a) Disconnect the y16 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 |
|---|---|---|
| y16-3 (RCL+) - y14-3 | Always | Below 1 Ω |
| y16-3 (RCL+) or y14-3 - Body ground | Always | 10 kΩ or higher |
| y16-7 (RCL-) - y14-4 | Always | Below 1 Ω |
| y16-7 (RCL-) or y14-4 - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FOLD SEAT CONTROL ECU (LH SEAT) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Position Sensor Circuit
DESCRIPTION When a fold seat control ECU receives signals from the fold seat switch assembly or No. 1 fold seat switch assembly, it operates the reclining motor and lifter motor of its corresponding r ...
Power Source Circuit
DESCRIPTION Power is supplied to each fold seat control ECU through fuses. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the f ...
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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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