Note
Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.
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.
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 | Link |
|---|---|---|
| Theft deterrent system cannot be set | Immobiliser system (w/ Entry and Start System)" security indicator light does not blink" | |
| Immobiliser system (w/o Entry and Start System)" security indicator light does not blink" | ||
| ACC signal circuit | ||
| IG signal circuit | ||
| Door unlock detection switch circuit | ||
| Door courtesy switch circuit | ||
| Back door courtesy switch circuit | ||
| Engine hood courtesy switch circuit | ||
| Unlock warning switch circuit (w/o Entry and Start System) | ||
| 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 | Immobiliser system (w/ Entry and Start System)" security indicator light does not blink" | |
| Immobiliser system (w/o Entry and Start System)" security indicator light does not blink" | ||
| Theft deterrent system cannot be unset by turning the engine on. | Replace the main body ECU (multiplex network body ECU) (for LHD) | |
| Replace the main body ECU (multiplex network body ECU) (for RHD) | ||
| Theft deterrent system can be set even when door is open | Door courtesy switch circuit | |
| Back 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) | ||
| Theft deterrent system can be set even when hood is open | Engine hood courtesy switch circuit | |
| Vehicle horns do not sound while theft deterrent system is in alarm sounding state | Horn circuit | |
| Hazard warning lights do not flash while theft deterrent system is in 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) | ||
| Security horn does not sound while theft deterrent system is in alarm sounding state*1 | Security horn circuit | |
| Theft warning siren does not sound while theft deterrent system is in warning operation*2 | Theft Warning Siren 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) | ||
| The vehicle does not enter the alarm sounding state in accordance with intrusion sensor operation*2 | Intrusion sensor circuit | |
| Intrusion sensor cancel 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 RHD) | ||
| Intrusion sensor cancel switch does not operate*2 | Intrusion sensor cancel 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 RHD) | ||
| Glass breakage sensor does not operate*2 | Glass breakage sensor circuit | |
| The vehicle does not enter the alarm sounding state as the battery is reconnected | Check the battery (for 8NR-FTS) | |
| Check the battery (for 3ZR-FAE) | ||
| Power Source Circuit | ||
| The warning sounds itself | Improper Operation |
*1: w/o Intrusion Sensor
*2: w/ Intrusion Sensor