Tech Tips
Use the table below to help determine the cause of the problem symptom. 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.
The theft deterrent system is based on the premise that the power door lock control system and wireless door lock control system are operating normally. Check these systems first before troubleshooting the theft deterrent system.
| Symptom | Suspected Area | See page |
|---|---|---|
| Theft deterrent system cannot be set | 1. Security indicator light circuit | |
| 2. ECU power source circuit | ||
| 3. Unlock warning switch | ||
| 4. Door lock and unlock switch | ||
| 5. Driver side door courtesy switch circuit | ||
| 6. Front passenger side door courtesy switch circuit | ||
| 7. Rear door courtesy switch LH circuit | ||
| 8. Rear door courtesy switch RH circuit | ||
| 9. Back door courtesy switch circuit | ||
| 10. Engine hood courtesy switch circuit | ||
| Security indicator light is not flashing when theft deterrent system is set | 1. Security indicator light circuit | |
| Alarm sounding state cannot be canceled when ignition switch is turned ON | 1. Ignition switch circuit | |
| 2. Unlock warning switch | ||
| Theft deterrent system can be set even when door is open | 1. Driver side door courtesy switch circuit | |
| 2. Front passenger side door courtesy switch circuit | ||
| 3. Rear door courtesy switch LH circuit | ||
| 4. Rear door courtesy switch RH circuit | ||
| 5. Back door courtesy switch circuit | ||
| Vehicle horns do not sound while theft deterrent system is in warning operation | 1. Horn circuit | |
| Hazard warning lights are not flashing while theft deterrent system is in warning operation | 1. Hazard warning switch | |
| Security horn does not sound while theft deterrent system is in warning operation | 1. Security horn circuit | |
| Hazard warning lights are flashing even when theft deterrent system is not set | 1. Hazard warning switch |
If the suspected areas are found to be functioning normally, replace the theft warning ECU assembly.