Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Fold Seat Switch Circuit
DESCRIPTION
When the fold seat switch assembly is operated, a switch operation signal is sent to the fold seat control ECU. According to the signal received, the fold seat control ECU operates the fold motor to perform a fold or return operation of the rear seatback.
WIRING DIAGRAM
PROCEDURE
| 1. | CHECK FOLD SEAT CONTROL ECU |
| (a) Check the fold seat control ECU. (1) Remove the fold seat control ECU with its connectors still connected.
(2) Measure the voltage according to the value(s) in the table below. Standard Voltage: for Rear RH Seat
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| OK | .gif) | GO TO PROBLEM SYMPTOMS TABLE |
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| 2. | INSPECT FOLD SEAT SWITCH ASSEMBLY |
(a) Remove the fold seat switch assembly.
Click here .gif)
(b) Inspect the fold seat switch assembly.
Click here
| NG | | REPLACE FOLD SEAT SWITCH ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (FOLD SEAT SWITCH ASSEMBLY - FOLD SEAT CONTROL ECU AND BODY GROUND) |
(a) Disconnect the R31 fold seat switch assembly connector.
(b) Disconnect the x3*1 or y3*2 fold seat control ECU connector.
- *1: for Rear RH Seat
- *2: for Rear LH Seat
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for Rear RH Seat| Tester Connection | Condition | Specified Condition |
|---|---|---|
| R31-6 (FOLD) - x3-26 (FOLD) | Always | Below 1 Ω |
| R31-6 (FOLD) or x3-26 (FOLD) - Body ground | Always | 10 kΩ or higher |
| R31-1 (RTRN) - x3-25 (RTRN) | Always | Below 1 Ω |
| R31-1 (RTRN) or x3-25 (RTRN) - Body ground | Always | 10 kΩ or higher |
| R31-7 (E) - Body ground | Always | Below 1 Ω |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| R31-8 (FOLD) - y3-26 (FOLD) | Always | Below 1 Ω |
| R31-8 (FOLD) or y3-26 (FOLD) - Body ground | Always | 10 kΩ or higher |
| R31-3 (RTRN) - y3-25 (RTRN) | Always | Below 1 Ω |
| R31-3 (RTRN) or y3-25 (RTRN) - Body ground | Always | 10 kΩ or higher |
| R31-7 (E) - Body ground | Always | Below 1 Ω |
| OK | | REPLACE FOLD SEAT CONTROL ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Back Door Courtesy Switch Circuit
DESCRIPTION The fold seat control ECU receives switch operation signals, the driving condition signal and back door courtesy light switch assembly signal and operates the rear power seat according to ...
Power Source Circuit
DESCRIPTION Power is supplied to the fold seat control ECU through the ECU-DCC NO. 2, P/SEAT R/R*1, P/SEAT R/L*2 and ECU-IG1 NO. 4 fuses.
*1: for Rear Right Seat
*2: for Rear Left Seat
WIRING ...
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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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