Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

When the fold seat control ECU (RH/LH seat) is replaced , it is necessary to perform initialization.

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HINT:

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Symptom

Suspected Area

Link

Fold/Return functions do not operate.

(Using fold seat switch assembly and No. 1 fold seat switch assembly)

Initialization

Proceed to "Power Source Circuit"

Proceed to "Park/Neutral Position Switch Circuit"

Proceed to "IG Signal Circuit"

Proceed to "Power Seat Motor Circuit"

Fold seat control ECU (RH seat)

Fold seat control ECU (LH seat)

Fold/Return functions do not operate.

(Using No. 1 fold seat switch assembly)

Proceed to "Back Door Courtesy Switch Circuit"

Proceed to "Fold Seat Switch Circuit"

Fold seat control ECU (RH seat)

Fold seat control ECU (LH seat)

Fold/Return functions do not operate.

(Using fold seat switch assembly)

Proceed to "Fold Seat Switch Circuit"

Fold seat control ECU (RH seat)

Fold seat control ECU (LH seat)

Buzzer sounds continuously even though the rear No. 2 power seat is in the fully folded or returned position

Initialization

Operation check

Proceed to "Position Sensor Circuit"

Fold seat control ECU (RH seat)

Fold seat control ECU (LH seat)

Jam protection function operates unnecessarily

Check for foreign objects around the rear No. 2 power seat

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Initialization

Operation check

Proceed to "Position Sensor Circuit"

Fold seat control ECU (RH seat)

Fold seat control ECU (LH seat)

    Initialization
    INITIALIZATION 1. INITIALIZATION (INITIAL POSITION CLEAR) NOTICE: It is necessary to perform initialization (initial position clear) if any of the following conditions are met. The fold seat contro ...

    Terminals Of Ecu
    TERMINALS OF ECU CHECK FOLD SEAT CONTROL ECU (RH SEAT) (a) Disconnect the x15 and x16 fold seat control ECU (RH seat) connectors. (b) Measure the resistance and voltage according to the value(s) in t ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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