Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

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.
Rear Power Seat Control System

Symptom

Suspected Area

Link

No functions operate.

Operation check

Initialization

Proceed to "Power Source Circuit"

Fold seat control ECU

Fold/Return functions do not operate using a rear power seat switch.

Operation check

Proceed to "Park/Neutral Position Switch Circuit"

Proceed to "Rear Power Seat Switch Circuit"

Proceed to "Rear Door Courtesy Switch Circuit"

Proceed to "Folding Motor Circuit"

Fold/Return functions do not operate using the fold seat switch assembly.

Operation check

Proceed to "Park/Neutral Position Switch Circuit"

Proceed to "Fold Seat Switch Circuit"

Proceed to "Back Door Courtesy Switch Circuit"

Proceed to "Folding Motor Circuit"

Reclining function does not operate.

Operation check

Proceed to "Fold Seat Switch Circuit"

Proceed to "Reclining Motor Circuit"

Fold seat control ECU

Buzzer sounds continuously while engine switch is on (IG) and functions do not operate.

Operation check

Initialization

Proceed to "Power Source Circuit"

Fold seat control ECU

Seatback only operates partway.

Operation check

Initialization

Proceed to "Reclining Motor Circuit"

Proceed to "Folding Motor Circuit"

    Initialization
    INITIALIZATION INITIALIZATION (INITIAL POSITION MEMORIZATION) NOTICE: It is necessary to perform Initialization (initial position memorization) in the following situations. The fold seat control EC ...

    Park / Neutral Position Switch Circuit
    DESCRIPTION The fold seat control ECU receives switch operation signals, the back door courtesy light switch assembly signal*1, rear door courtesy light switch assembly signal*2 and driving condition ...

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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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