Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: 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 DIAGRAM
CAUTION / NOTICE / HINT
HINT:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - BATTERY AND BODY GROUND) |
| *A | for Rear RH Seat |
| *B | for Rear LH Seat |
| *a | Front view of wire harness connector (to Fold Seat Control ECU) |
(a) Disconnect the x3*1 or y3*2 and x4*1 or y4*2 fold seat control ECU (rear right seat) connectors.
- *1: for Rear RH Seat
- *2: for Rear LH Seat
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for Rear RH Seat| Tester Connection | Condition | Specified Condition |
|---|---|---|
| x4-1 (IND1) - Body ground | Always | 11 to 14 V |
| x4-2 (+B) - Body ground | Always | 11 to 14 V |
| x3-1 (ECUB) - Body ground | Always | 11 to 14 V |
| x3-3 (IG) - Body ground | Engine switch off → on (IG) | Below 1 V → 11 to 14 V |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| y4-1 (IND1) - Body ground | Always | 11 to 14 V |
| y4-2 (+B) - Body ground | Always | 11 to 14 V |
| y3-1 (ECUB) - Body ground | Always | 11 to 14 V |
| y3-3 (IG) - Body ground | Engine switch off → on (IG) | Below 1 V → 11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for Rear RH Seat| Tester Connection | Condition | Specified Condition |
|---|---|---|
| x4-10 (GND) - Body ground | Always | Below 1 Ω |
| x4-9 (GND2) - Body ground | Always | Below 1 Ω |
| x3-40 (IND2) - Body ground | Always | Below 1 Ω |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| y4-10 (GND) - Body ground | Always | Below 1 Ω |
| y4-9 (GND2) - Body ground | Always | Below 1 Ω |
| y3-40 (IND2) - Body ground | Always | Below 1 Ω |
| OK | .gif) | GO TO PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Fold Seat Switch Circuit
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Folding Motor Circuit
DESCRIPTION HINT:
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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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