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"*1 | |
| Immobiliser system (w/o entry and start system) "security indicator light does not blink"*2 | ||
| Front door courtesy switch circuit | ||
| Rear door courtesy switch circuit | ||
| Back door courtesy switch circuit | ||
| Front door lock assembly | ||
| Rear door lock assembly | ||
| Back door lock assembly | ||
| Engine hood courtesy switch circuit | ||
| Ignition switch circuit*2 | ||
| Unlock warning switch circuit*2 | ||
| 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) | ||
| 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"*1 | |
| Immobiliser system (w/o entry and start system) "security indicator light does not blink"*2 | ||
| Alarm sounding state cannot be canceled when ignition switch is turned to ON*1 | Entry and start system (for start function) | |
| Certification ECU (smart key ECU 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) | ||
| Theft deterrent system can be set even when door is open | Front door courtesy switch circuit | |
| Rear 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) | ||
| Theft deterrent system can be set even when engine hood is open | Engine hood courtesy switch circuit | |
| Vehicle horn does not sound while theft deterrent system is in warning operation | Horn circuit | |
| Hazard warning lights do not flash while theft deterrent system is in warning operation | Combination meter assembly | - |
| If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) | ||
| Security horn does not sound while theft deterrent system is in warning operation | Security 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 areas are inspected and proved to be normal, replace the main body ECU (multiplex network body ECU) |
*1: w/ Entry and Start System
*2: w/o Entry and Start System
*3: for Hatchback
*4: for Wagon