Tech Tips
Troubleshooting of the theft deterrent system is based on the premise that the 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 door lock control system and the wireless door lock control system are operating normally.
The following is the troubleshooting procedure for the theft deterrent system of a vehicle without the smart entry and start system.
Inspect the fuse and relay before investigating the suspected areas shown in the table below.
| Symptom | Suspected Area | See page |
|---|---|---|
| Theft deterrent system cannot be set | Security indicator light circuit | |
| ECU power source circuit | ||
| Unlock warning switch circuit | ||
| Door key lock / unlock switch | ||
| Door courtesy switch circuit | ||
| Back door courtesy switch circuit | ||
| Engine hood courtesy switch circuit | ||
| Glass hatch courtesy switch *1 | ||
| If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Security indicator light does not blink when theft deterrent system is set | Security indicator light circuit | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Alarm sounding state cannot be canceled when ignition switch is turned on | Ignition switch circuit | |
| Unlock warning switch circuit | ||
| If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Theft deterrent system can be set even when a door is open | Door courtesy switch circuit | |
| Glass hatch courtesy switch *1 | ||
| If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Vehicle horns (low pitched, high pitched) do not sound while theft deterrent system is in warning operation | Horn circuit | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Headlights do not flash while theft deterrent system is in warning operation *2 | Headlight Relay Circuit | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Taillights do not flash while theft deterrent system is in warning operation *2 | Taillight Relay Circuit | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Hazard warning lights do not flash while theft deterrent system is in warning operation | Wire harness or connector | - |
| Turn signal flasher | ||
| If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Interior light does not light up while theft deterrent system is in warning operation | Interior light circuit | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Security horn does not sound while theft deterrent system is in warning operation | Security horn circuit | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Headlights flash even when theft deterrent system is not set *2 | Headlight Relay Circuit | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Taillights flash even when theft deterrent system is not set *2 | Taillight Relay Circuit | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Hazard warning lights flash even when theft deterrent system is not set | Wire harness or connector | - |
| Turn signal flasher | ||
| If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - | |
| Interior light comes on even when theft deterrent system is not set | Interior light circuit | |
| If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (Instrument panel junction block) | - |
Tech Tips
*1: w/ Glass Hatch Opener System
*2: for RHD (used for panic alarm)