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.
| Symptom | Suspected Area | Link |
|---|---|---|
| Only driver door LOCK functions do not operate | Front door lock with motor assembly LH | |
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Only driver door UNLOCK functions do not operate | Front door lock with motor assembly LH | |
| Wire harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Instrument panel junction block assembly | - | |
| Only front passenger door LOCK/UNLOCK functions do not operate | Front door lock with motor assembly RH | |
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Only rear door LH LOCK/UNLOCK functions do not operate. | Rear door lock assembly LH | |
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Only rear door RH LOCK/UNLOCK functions do not operate. | Rear door lock assembly RH | |
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Only back door open function does not operate. | Power Back Door System | |
| All doors LOCK/UNLOCK functions do not operate via door control switch or door key cylinder | Proceed to "All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch or Door Key Cylinder" | |
| All doors LOCK/UNLOCK functions do not operate via door control switch | Proceed to "All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch" | |
| All doors LOCK/UNLOCK functions do not operate via multiplex network master switch assembly and door key cylinder. | Instrument panel junction block assembly | - |
| Main body ECU (Multiplex network body ECU) | - | |
| Lock operation continues even after doors have been locked*1 | Front door lock with motor assembly LH | |
| Front door lock with motor assembly RH | | |
| Rear door lock assembly LH | | |
| Rear door lock assembly RH | | |
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Only remote door LOCK/UNLOCK functions do not operate (power door lock operation is normally)*2 | DCM (Telematics system) | |
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HINT:
- *1: When the door unlock detection switch detects an unlock position signal after a door lock operation has been performed, a door lock operation will be performed 3 times.
- *2: w/ LEXUS ENFORM Remote
Operation Check
OPERATION CHECK CHECK POWER DOOR LOCK OPERATION NOTICE: The operation check below is based on the non-customized initial condition of the vehicle. (a) Check basic functions. (1) Check that all of the ...
Terminals Of Ecu
TERMINALS OF ECU CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junc ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Main Body Ecu: Installation
INSTALLATION CAUTION / NOTICE / HINT NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
After the main body ECU (multiplex network body ECU) has been replaced, the automatic light control system will not operate until the engine is sta ...
Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Climate Control Seat System: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use this procedure to troubleshoot the climate control seat system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS (a) Interview the customer to confirm the problem. Click here ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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