Note
w/ Door Control Battery:
As the door control battery is installed between the vehicle battery and body ECU, first perform the inspections to confirm that there are no malfunctions in the power source circuit for the body ECU before performing this troubleshooting procedure.
w/ Automatic Light Control System:
If the body ECU has been replaced, it is necessary to initialize the body ECU.
When replacing the combination meter assembly, make sure to replace it with a new one.
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 | ECU power source circuit | |
| Immobiliser system "security indicator light does not blink"*1 | ||
| Immobiliser system "security indicator light does not blink"*2 | ||
| Security indicator light circuit*2 | ||
| Door courtesy switch circuit | ||
| Front door lock assembly | ||
| Engine hood courtesy switch circuit | ||
| Unlock warning switch circuit*2 | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the body ECU (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the body ECU (for RHD) | ||
| Security indicator light does not blink when theft deterrent system is set | ECU power source circuit | |
| Security indicator light circuit*2 | ||
| Immobiliser system "security indicator light does not blink"*1 | ||
| Immobiliser 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 body ECU (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the body ECU (for RHD) | ||
| Alarm sounding state cannot be canceled when ignition switch is turned to ON*2 | Ignition switch circuit | |
| Theft deterrent system can be set even when door is open | Door courtesy switch circuit | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the body ECU (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the body ECU (for RHD) | ||
| 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 | |
| The intrusion sensor does not turn off (w/ Intrusion Sensor) | Intrusion sensor cancel switch circuit | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the body ECU (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the body ECU (for RHD) | ||
| The vehicle does not enter the alarm sounding state according to intrusion sensor operation (w/ Intrusion Sensor) | Intrusion sensor cancel switch circuit | |
| Intrusion sensor circuit | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the body ECU (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the body ECU (for RHD) | ||
| 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 area is inspected and proved to be normal, replace the body ECU (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the body ECU (for RHD) | ||
| Security horn does not sound while theft deterrent system is in warning operation (w/ Security Horn Assembly) | Security horn circuit | |
| The theft warning siren assembly does not operate due to the battery being disconnected when the vehicle is in the alarm sounding state (w/ Theft Warning Siren Assembly) | 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 body ECU (for LHD) | ||
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the body ECU (for RHD) |
*1: w/ Entry and Start System
*2: w/o Entry and Start System