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.
Inspect the fuse and relay before investigating the suspected areas shown in the table below.
Use the table below to help determine the cause of a problem. The likely causes of the problem are indicated in descending order. Check each suspected area in order. Repair or replace faulty parts or perform adjustments as necessary.
| Symptom | Suspected Area | See page |
|---|---|---|
| Theft deterrent system cannot be set | ECU power source circuit | |
| Front door lock assembly | ||
| Rear door lock assembly | ||
| Back door lock assembly | ||
| Door courtesy switch circuit | ||
| Engine hood courtesy switch circuit | ||
| Replace certification ECU (smart key ECU 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 indicator does not come on while theft deterrent system is in warning operation | Engine immobiliser system | |
| Alarm sounding state cannot be canceled when power switch is turned on (IG) | Entry and Start System (for start function) | |
| 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) | - | |
| Theft deterrent system can be set even when a door is open | Door courtesy switch circuit | |
| 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) | - | |
| Vehicle horn does not sound while theft deterrent system is in warning operation | Horn circuit | |
| 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) | - | |
| Hazard warning lights do not flash while theft deterrent system is in warning operation | Wire harness | - |
| Turn signal flasher assembly | ||
| Instrument panel junction block 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) | - | |
| Theft warning siren does not sound while theft deterrent system is in warning operation | Theft warning siren circuit | |
| 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) | - | |
| Hazard warning lights flash even when theft deterrent system is not set | Wire harness | - |
| Turn signal flasher assembly | ||
| Instrument panel junction block 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) | - | |
| Glass breakage sensor does not operate | Glass breakage sensor circuit | |
| 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) | - | |
| Intrusion sensor cancel switch does not operate | Intrusion sensor cancel switch circuit | |
| 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) | - |