Lexus RX (RX 350L, RX450h) 2016-2025 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 the system before inspecting the suspected areas below.
  • If the problem occurs in certain locations or times of day, the possibility of wave interference is high.
  • If a malfunction occurred after optional components were installed by the dealer, check if there is wave interference from the components.
Smart Access System with Push-button Start (for Start Function)

Symptom

Suspected Area

Link

Power source mode does not change to on (IG) or on (ACC)

Refer to "Power Source Mode does not Change to ON (IG and ACC)"

Power source mode does not change to on (IG)

Refer to "Power Source Mode does not Change to ON (IG)"

Power source mode does not change to on (ACC)

Refer to "Power Source Mode does not Change to ON (ACC)"

Engine does not start

Refer to "Engine does not Start"

Engine cannot be started by remote air conditioner with remote start (Both the wireless door lock control system and push-button start function operate normally)*

Refer to "Remote Engine Starter does not Operate"

  • *: w/ Lexus Enform Remote
    Customize Parameters
    CUSTOMIZE PARAMETERS CUSTOMIZE SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) NOTICE: When the customer requests a change in a function, first make sure that the function can be cu ...

    Terminals Of Ecu
    TERMINALS OF ECU CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (a) Disconnect the A74, R1 and J41 certification ECU (smart key ECU assembly) connectors. (b) Measure the voltage and resistance acco ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Lexus Enform System: DCM Data Signal Circuit between Navigation ECU and DCM
    DESCRIPTION This circuit is used to send and receive signals between the DCM (Telematics Transceiver), radio receiver assembly and navigation ECU. WIRING DIAGRAM PROCEDURE 1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) (a) Disconnect the J157 DCM (T ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Power Steering System: How To Proceed With Troubleshooting
    CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the power steering system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2. INSPECT BATTERY VOLTAGE (a) Turn the engine switch off. (b) Measure the voltage of the batt ...

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

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

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