Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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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 |
|---|---|---|
| Remote up / down function does not operate | LIN communication system | |
| Multiplex network master switch assembly | - | |
| Power window regulator motor assembly (for front passenger door) | - | |
| Power window regulator motor assembly (for rear LH door) | - | |
| Power window regulator motor assembly (for rear RH door) | - | |
| Driver side power window does not operate with power window master switch | LIN communication system | |
| Power window regulator motor assembly (for driver door) | - | |
| Multiplex network master switch assembly | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Wire harness or connector | - | |
| Front passenger side power window does not operate with front passenger side power window switch | LIN communication system | |
| Power window regulator motor assembly (for front passenger door) | - | |
| Power window regulator switch assembly | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Wire harness or connector | - | |
| Rear power window LH does not operate with rear power window switch LH | LIN communication system | |
| Power window regulator motor assembly (for rear LH door) | - | |
| Rear power window regulator switch assembly (for LH door) | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Wire harness or connector | - | |
| Rear power window RH does not operate with rear power window switch RH | LIN communication system | |
| Power window regulator motor assembly (for rear RH door) | - | |
| Rear power window regulator switch assembly (for RH door) | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Wire harness or connector | - | |
| Driver side power window auto up / down function does not operate with power window master switch | LIN communication system | |
| Power window regulator motor assembly (for driver door) | - | |
| Multiplex network master switch assembly | - | |
| Power window position initialization | - | |
| Wire harness or connector | - | |
| Front passenger side power window auto up / down function does not operate with front passenger side power window switch | Power window regulator motor assembly (for front passenger door) | |
| Power window regulator switch assembly | - | |
| Power window position initialization | - | |
| Wire harness or connector | - | |
| Rear power window LH auto up / down function does not operate with rear power window switch LH | Power window regulator motor assembly (for rear LH door) | |
| Rear power window regulator switch assembly (for LH door) | - | |
| Power window position initialization | - | |
| Wire harness or connector | - | |
| Rear power window RH auto up / down function does not operate with rear power window switch RH | Power window regulator motor assembly (for rear RH door) | |
| Rear power window regulator switch assembly (for RH door) | - | |
| Power window position initialization | - | |
| Wire harness or connector | - | |
| All power windows do not operate with driver side door key cylinder or wireless transmitter | LIN communication system | |
| Wireless door lock control system | - | |
| Power door lock control system | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Key-off operation function operates even if operating conditions are not satisfied | LIN communication system | |
| Lighting system | - | |
| Power window regulator motor assembly (for driver door) | - | |
| Power window regulator motor assembly (for front passenger door) | - | |
| Power window regulator motor assembly (for rear LH door) | - | |
| Power window regulator motor assembly (for rear RH door) | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Auto up operation does not fully close power window (jam protection function is activated) | Power window position initialization (applicable location) | |
| Improper installation (applicable location) | - | |
| Power window regulator motor assembly (for driver door) | - | |
| Power window regulator motor assembly (for front passenger door) | - | |
| Power window regulator motor assembly (for rear LH door) | - | |
| Power window regulator motor assembly (for rear RH door) | - | |
| Auto down operation does not fully open power window (catch protection function is activated) | Power window position initialization (applicable location) | |
| Improper installation (applicable location) | - | |
| Power window regulator motor assembly (for driver door) | - | |
| Power window regulator motor assembly (for front passenger door) | - | |
| Power window regulator motor assembly (for rear LH door) | - | |
| Power window regulator motor assembly (for rear RH door) | - | |
| Jam protection function does not operate | Power window position initialization (applicable location) | |
| Power window regulator motor assembly (for driver door) | - | |
| Power window regulator motor assembly (for front passenger door) | - | |
| Power window regulator motor assembly (for rear LH door) | - | |
| Power window regulator motor assembly (for rear RH door) | - | |
| Power windows do not operate using all window switch | Main body ECU (Multiplex network body ECU) | |
Initialization
INITIALIZATION INITIALIZE POWER WINDOW CONTROL SYSTEM (ALL DOORS) NOTICE:
When a door window regulator sub-assembly, power window regulator motor assembly, door glass or door glass run is reinstall ...
Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) Power window control system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3). When the system seems to be malfunct ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Lin Communication System: Communication Malfunction between ECUs Connected by LIN (B2785)
DESCRIPTION If the certification ECU (smart key ECU assembly) detects a communication error with an ECU connected to the certification bus lines for 7 sedonds or more, DTC B2785 will be stored. DTC No. Detection Item DTC Detection Condition Trouble Area B2785 Communication Malfunction ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Dynamic Radar Cruise Control System: Lost Communication with Cruise Control Front Distance Range Sensor Single Sensor or Center Missing Message (U023587)
DESCRIPTION The forward recognition camera communicates with the millimeter wave radar sensor assembly via CAN communication. If a communication malfunction between the forward recognition camera and millimeter wave radar sensor assembly is detected, DTC U023587 is stored. DTC No. Detection Ite ...
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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