Tech Tips
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.
| Symptom | Suspected Area | See page |
|---|---|---|
| "Check Headlight System" is displayed on the multi-information display (headlight leveling control is normal) (for TMC, TMMR Made) | Headlight beam level warning circuit | |
| Headlight leveling ECU assembly | ||
| "Check Headlight Leveling System" is displayed on the multi-information display (headlight leveling control is normal) (for TMMK Made) | Headlight beam level warning circuit | |
| Headlight leveling ECU assembly | ||
| Headlight beam level control does not operate. | Check the FAIL-SAFE function | |
| Check DTCs | ||
| Headlight leveling ECU power source circuit | ||
| Headlight signal circuit | ||
| Headlight beam level control actuator circuit | ||
| Speed signal circuit | ||
| Headlight leveling ECU assembly | ||
| DTC information cannot be detected. | Diagnosis circuit | |
| Headlight leveling ECU assembly | ||
| Initialization cannot be performed. | Check DTCs | |
| LVL terminal circuit | ||
| Headlight leveling ECU assembly |
Note
Initialize the headlight leveling ECU assembly after the vehicle height changes due to replacement of suspension components or after performing operations such as removal and reinstallation or replacement of the rear height control sensor sub-assembly.
When the headlight leveling ECU assembly is replaced, initialization is also necessary.