Note
When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.
As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*
*: w/ Door Control Battery
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.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Only wireless control function is inoperative | Proceed to "Only wireless control function is inoperative" | |
| Only answer-back function does not operate properly | Proceed to "No answer-back" | |
| Only automatic lock function does not operate properly | Perform operation check | |
| Key reminder warning system | ||
| Lighting system (Door courtesy light switch circuit) | ||
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) | ||
| Only illuminated entry function does not operate | Perform operation check | |
| Lighting system | ||
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) |