Note
w/ Door control Battery:
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 Click here.
Tech Tips
Troubleshooting of the theft deterrent system is based on the premise that the power door lock control system and the wireless door lock control system are operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that the power door lock control system and the wireless door lock control system are operating normally.
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 | See page |
|---|---|---|
| The theft deterrent system cannot be set or canceled | Engine immobiliser system "security indicator light does not blink" | |
| ACC signal circuit | ||
| IG signal circuit | ||
| Door unlock detection switch circuit | ||
| Door courtesy switch circuit | ||
| Engine hood courtesy switch circuit | ||
| Harness or connector | - | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for RHD) | ||
| After a wireless door lock operation is performed with the luggage compartment door open, the theft deterrent system is not set when the luggage compartment door is closed | Engine immobiliser system "security indicator light does not blink" | |
| ACC signal circuit | ||
| IG signal circuit | ||
| Door unlock detection switch circuit | ||
| Door courtesy switch circuit | ||
| Engine hood courtesy switch circuit | ||
| Harness or connector | - | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for RHD) | ||
| After a wireless door lock operation is performed with the hood open, the theft deterrent system is not set when the hood is closed | Engine immobiliser system "security indicator light does not blink" | |
| ACC signal circuit | ||
| IG signal circuit | ||
| Door unlock detection switch circuit | ||
| Door courtesy switch circuit | ||
| Engine hood courtesy switch circuit | ||
| Harness or connector | - | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for RHD) | ||
| Security indicator light does not blink when theft deterrent system is set | Engine immobiliser system "security indicator light does not blink" | |
| The theft deterrent system becomes set by itself | Door courtesy switch circuit | |
| Engine hood courtesy switch circuit | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for RHD) | ||
| None of the alarm functions operate or the theft deterrent system can be set even when all necessary conditions are not met | Door unlock detection switch circuit | |
| Door courtesy switch circuit | ||
| Engine hood courtesy switch circuit | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for RHD) | ||
| Even when the luggage compartment door is opened using the wireless function and the luggage compartment door opens, the theft deterrent system is not canceled and the vehicle enters the alarm sounding state | Main body ECU (multiplex network body ECU) (for LHD) | |
| Main body ECU (multiplex network body ECU) (for RHD) | ||
| The doors are not forcibly locked when the vehicle is in the alarm sounding state | Wireless door lock control system | |
| Door unlock detection switch circuit | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for RHD) | ||
| The vehicle does not enter the alarm sounding state when the battery is reconnected while the vehicle is in the armed state | Check operation of the security indicator light | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for RHD) | ||
| The vehicle does not enter the alarm sounding state when the hood is opened while the vehicle is in the armed state | Check operation of the security indicator light | |
| Engine hood courtesy switch circuit | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for RHD) | ||
| The vehicle does not enter the alarm sounding state when the doors are unlocked while the vehicle is in the armed state | Door unlock detection switch circuit | |
| Door courtesy switch circuit | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for RHD) | ||
| The security horn assembly does not operate when the vehicle is in the alarm sounding state | Security horn circuit | |
| The hazard warning lights do not operate when the vehicle is in the alarm sounding state | Combination meter assembly | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for RHD) | ||
| The vehicle horn does not operate when the vehicle is in the alarm sounding state | Horn circuit | |
| Hazard warning lights flash even when theft deterrent system is not set | Combination meter assembly | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) (for RHD) |