Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
.gif)
- When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
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.
Headlight| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right low beam headlight does not illuminate | Headlight unit*1 | |
| Headlight assembly*2 | | |
| Semiconductor power integration ECU | | |
| Harness or connector | - | |
| Both left and right low beam headlights do not illuminate | Headlight dimmer switch circuit | |
| Low Beam Headlight Circuit | | |
| Main body ECU (Multiplex network body ECU) | | |
| Left or right high beam headlight does not illuminate | Headlight unit*1 | |
| Headlight assembly*2 | | |
| Semiconductor power integration ECU | | |
| Harness or connector | - | |
| Both left and right high beam headlights do not illuminate | Headlight dimmer switch circuit | |
| High beam headlight circuit | | |
| Main body ECU (Multiplex network body ECU) | | |
| High Flash (passing function) does not operate (high beam headlights are normal) | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) | |
- *1: for TMC Made
- *2: for TMMC Made
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right parking light does not illuminate | Headlight unit*1 | |
| Headlight assembly*2 | | |
| Harness or connector | - | |
| Both left and right parking lights do not illuminate | Headlight dimmer switch circuit | |
| Taillight relay circuit | | |
| Harness or connector | - |
- *1: for TMC Made
- *2: for TMMC Made
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right front side marker light does not illuminate | Front side marker light bulb | |
| Harness or connector | - | |
| Both left and right front side marker lights do not illuminate | Headlight dimmer switch circuit | |
| Taillight relay circuit | | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right daytime running light does not illuminate | Headlight unit*1 | |
| Headlight assembly*2 | | |
| Semiconductor power integration ECU | | |
| Harness or connector | - | |
| Both left and right daytime running lights do not illuminate | Check customize settings | |
| Headlight dimmer switch circuit | | |
| Daytime running light relay circuit | | |
| Main body ECU (Multiplex network body ECU) | |
- *1: for TMC Made
- *2: for TMMC Made
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right taillight (rear combination light assembly) does not illuminate | Rear combination light assembly (w/ Rear No. 2 Seat) | |
| Rear combination light assembly (w/o Rear No. 2 Seat) | | |
| Rear light cord (w/ Rear No. 2 Seat)* | | |
| Rear light cord (w/o Rear No. 2 Seat)* | | |
| Harness or connector | - | |
| Left or right taillight (rear light assembly) does not illuminate | Rear light assembly | |
| Rear light socket and wire | | |
| Harness or connector | - | |
| All of the taillights, license plate lights and rear side marker lights do not illuminate | Headlight dimmer switch circuit | |
| Taillight relay circuit | | |
| Main body ECU (Multiplex network body ECU) | |
- *: for Bulb Type Turn Signal Light
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right rear side marker light does not illuminate | Rear combination light assembly (w/ Rear No. 2 Seat) | |
| Rear combination light assembly (w/o Rear No. 2 Seat) | |
| Symptom | Suspected Area | Link |
|---|---|---|
| License plate light does not illuminate | License plate light assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right stop light (rear combination light assembly) does not illuminate | Rear combination light assembly (w/ Rear No. 2 Seat) | |
| Rear combination light assembly (w/o Rear No. 2 Seat) | | |
| Rear light cord (w/ Rear No. 2 Seat)* | | |
| Rear light cord (w/o Rear No. 2 Seat)* | | |
| Harness or connector | - | |
| Left or right stop light (rear light assembly) does not illuminate | Rear light assembly | |
| Rear light socket and wire | | |
| Harness or connector | - | |
| All of the stop lights do not illuminate | STOP fuse | - |
| Stop light switch assembly | | |
| Semiconductor power integration ECU | | |
| Harness or connector | - |
- *: for Bulb Type Turn Signal Light
| Symptom | Suspected Area | Link |
|---|---|---|
| High mounted stop light does not illuminate | Center stop light assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right back-up light does not illuminate | Rear light assembly*1 | |
| Back-up light bulb*2 | | |
| Rear light socket and wire | | |
| Harness or connector | - | |
| Both left and right back-up lights do not illuminate | ECU-ACC fuse | - |
| BKUP LP fuse | - | |
| Park/neutral position switch assembly (for U881E) | | |
| Park/neutral position switch assembly (for U881F) | | |
| Instrument panel junction block assembly | | |
| Harness or connector | - |
- *1: for LED Type Turn Signal Light
- *2: for Bulb Type Turn Signal Light
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right front turn signal light does not operate | Front turn signal light bulb | |
| Harness or connector | - | |
| Left or right rear turn signal light does not operate*1 | Rear combination light assembly (w/ Rear No. 2 Seat) | |
| Rear combination light assembly (w/o Rear No. 2 Seat) | | |
| Rear light assembly | | |
| Rear light socket and wire | | |
| Harness or connector | - | |
| Turn signal light circuit | | |
| Left or right rear turn signal light does not operate*2 | Rear turn signal light bulb | |
| Rear light cord (w/ Rear No. 2 Seat) | | |
| Rear light cord (w/o Rear No. 2 Seat) | | |
| Harness or connector | - | |
| Left or right side turn signal light does not operate | Side turn signal light assembly | |
| Outer rear view mirror assembly | | |
| Outer mirror control ECU assembly | | |
| Harness or connector | - | |
| Turn signal lights do not operate in one direction | Turn signal switch circuit | |
| Meter/gauge system | | |
| All turn signal lights do not operate | Turn signal switch circuit | |
| Combination meter assembly | | |
| All turn signal lights do not flash at the correct speed | Combination meter assembly | |
- *1: for LED Type Turn Signal Light
- *2: for Bulb Type Turn Signal Light
| Symptom | Suspected Area | Link |
|---|---|---|
| Hazard warning signal lights do not operate (turn signal lights are normal) | Hazard warning switch circuit | |
| Combination meter assembly | | |
| Hazard warning signal switch do not flash | Harness or connector | - |
| Hazard warning signal switch (radio receiver assembly) | | |
| Combination meter assembly | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Automatic light control system does not operate | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Light auto turn-off system does not operate | Headlight dimmer switch circuit | |
| IG signal circuit | | |
| Door courtesy switch circuit | | |
| Main body ECU (Multiplex network body ECU) | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Lights do not operate using remote operation function (Lighting system is normal) | Telematics system | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right outside handle foot light does not illuminate | Front door outside handle assembly | |
| Rear door outside handle assembly | | |
| Harness or connector | - | |
| All of the outside handle foot lights do not illuminate | Check customize settings | |
| Power door lock control system | | |
| Wireless door lock control system | | |
| Smart access system with push-button start (for entry function) | | |
| Door unlock detection switch circuit | | |
| Outside handle foot light circuit | | |
| Main body ECU (Multiplex network body ECU) | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Welcome light illumination control does not operate | Check customize settings | |
| Main body ECU (Multiplex network body ECU) | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Automatic high beam system does not operate or automatic high beam indicator does not illuminate (low beam headlights and high beam headlights are normal) | Front radar sensor system | |
| Check Data List (Front Recognition Camera High Temperature 2) | ||
| Check automatic high beam indicator light | ||
| Check Data List (Auto H Beam STS0) | ||
| Perform Active Test (Automatic High Beam Indicator) | ||
| Automatic high beam switch | ||
| Harness or connector | ||
| Combination meter assembly | ||
| Forward recognition camera | ||
| Main body ECU (Multiplex network body ECU) |
Operation Check
OPERATION CHECK AUTOMATIC LIGHT CONTROL SYSTEM OPERATION CHECK NOTICE: Make sure that the customize settings are set to default when performing the automatic light control system operation check. Clic ...
Terminals Of Ecu
TERMINALS OF ECU CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Heated Steering Wheel Controller: Removal
REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed, installed, or replaced during the steering vibration and heater ECU removal/installation are shown below. Necessary Procedure After Part ...
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Inner Rear View Mirror: Removal
REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during inner rear view mirror assembly removal/installation are shown below. Necessary Procedure After Parts R ...
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
0.0165