Problem Symptoms Table [10/2015 - 08/2019]
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2019 Lexus RX 450hL, 2019 Lexus RX 450h, 2018 Lexus RX 450hL, 2018 Lexus RX 450h, and 2017 Lexus RX 450h. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.
Refer to INITIALIZATION [10/2015 - 08/2019]
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.
AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM
| Symptom | Suspected Area | Link |
|---|---|---|
| Automatic headlight beam level control system does not operate (Left Headlight) (for Single Beam Headlight) | Headlight beam level control actuator circuit | Refer to Headlight Beam Level Control Actuator Circuit [10/2015 - 08/2019] |
| Headlight ECU sub-assembly LH | Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019] | |
| Automatic headlight beam level control system does not operate (Left Headlight) (for Triple Beam Headlight) | Headlight assembly LH | Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019] |
| Headlight ECU sub-assembly LH | Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019] | |
| Automatic headlight beam level control system does not operate (Right Headlight) (for Single Beam Headlight) | Headlight beam level control actuator circuit | Refer to Headlight Beam Level Control Actuator Circuit [10/2015 - 08/2019] |
| Headlight ECU sub-assembly RH | Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019] | |
| Automatic headlight beam level control system does not operate (Right Headlight) (for Triple Beam Headlight) | Headlight assembly RH | Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019] |
| Headlight ECU sub-assembly RH | Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019] | |
| Initialization cannot be performed | CAN communication system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - 08/2019] |
| Headlight ECU sub-assembly LH | Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019] |