Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Power Seat Power Easy Access System Function does not Operate
DESCRIPTION
-
The seat slides backward when either of the following conditions is met:
- The driver seat belt is unfastened with the engine switch off and the shift lever in P.
- The engine switch is turned from on (IG) or on (ACC) to off with the shift lever in P and the driver seat belt unfastened.
-
The seat slides forward when either of the following conditions is met:
- The driver seat belt is fastened with the engine switch on (IG) or on (ACC) and the shift lever in P or N.
- The engine switch is turned from off to on (IG) or on (ACC) with the shift lever in P and the driver seat belt unfastened.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
The front power seat control system (w/ Memory) uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.
Click here
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- Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CHECK FRONT POWER SEAT OPERATION |
(a) Check that each function of the power seat operates normally by using the position control ECU and switch assembly LH.
Click here
| Result | Proceed to |
|---|---|
| Power seat functions operate normally | A |
| All power seat functions do not operate | B |
| One or more power seat motors do not operate | C |
| B | .gif) | GO TO OTHER DIAGNOSTIC PROCEDURE (Front Power Seat does not Operate with Front Power Seat Switch) |
| C | | GO TO OTHER DIAGNOSTIC PROCEDURE (One or more Power Seat Motors do not Operate) |
|
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| 2. | READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Driver Seat / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Driver Seat > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Driver Seat Buckle SW | Driver seat belt buckle switch | ON or OFF | ON: Driver seat belt fastened OFF: Driver seat belt unfastened | - |
| Tester Display |
|---|
| Driver Seat Buckle SW |
OK:
On the Techstream screen, ON or OFF is displayed accordingly.
| NG | | GO TO STEP 8 |
|
| 3. | CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY LH - IG POWER SUPPLY) |
(a) Disconnect the S2 front seat outer belt assembly LH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| S2-1 (IG) - Body ground | Engine switch on (IG) | 11 to 14 V |
| S2-1 (IG) - Body ground | Engine switch off | Below 1 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY LH - POSITION CONTROL ECU AND SWITCH ASSEMBLY LH) |
(a) Disconnect the c6 position control ECU and switch assembly LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| S2-2 (L) - c6-9 (RDC) | Always | Below 1 Ω |
| S2-2 (L) or c6-9 (RDC) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | CHECK SEAT BELT TENSION REDUCER SYSTEM |
(a) Check the seat belt tension reducer system.
Click here
OK:
Seat belt tension reducer system is normal.
| NG | | REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH |
|
| 6. | REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH |
(a) Replace the position control ECU and switch assembly LH with a new or known good one.
Click here
|
| 7. | CHECK POWER SEAT POWER EASY ACCESS SYSTEM |
(a) Check the power seat easy access system.
Click here
OK:
Power seat power easy access system is normal.
| OK | | END (POSITION CONTROL ECU AND SWITCH ASSEMBLY LH WAS DEFECTIVE) |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 8. | INSPECT FRONT SEAT INNER BELT ASSEMBLY LH |
(a) Remove the front seat inner belt assembly LH.
Click here
(b) Inspect the front seat inner belt assembly LH.
Click here
| NG | | REPLACE FRONT SEAT INNER BELT ASSEMBLY LH |
|
| 9. | CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY LH - FRONT SEAT INNER BELT ASSEMBLY LH) |
(a) Disconnect the c6 position control ECU and switch assembly LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| c6-10 (DBCL) - c11-1 (RDC) | Always | Below 1 Ω |
| c6-10 (DBCL) or c11-1 (RDC) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH |
| 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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