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 |
|---|---|---|
| Only driver door LOCK/UNLOCK functions do not operate | Front door lock with motor assembly LH*1 | |
| Front door lock with motor assembly RH*2 | ||
| Wire harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Instrument panel junction block assembly | - | |
| Only front passenger door LOCK/UNLOCK functions do not operate | Front door lock with motor assembly RH*1 | |
| Front door lock with motor assembly LH*2 | ||
| Wire harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Instrument panel junction block assembly | - | |
| All doors LOCK/UNLOCK functions do not operate | Main body ECU (Multiplex network body ECU) | - |
| Instrument panel junction block assembly | - | |
| All doors LOCK/UNLOCK functions do not operate via door control switch or door key cylinder | Proceed to "All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch or Door Key Cylinder" | |
| All doors LOCK/UNLOCK functions do not operate via door control switch | Proceed to "All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch" | |
| Double locking function does not operate properly*3 | LIN communication system | |
| Front door lock with motor assembly LH | ||
| Front door lock with motor assembly RH | ||
| Wire harness or connector | - | |
| Double lock door control relay assembly | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Lock operation continues even after doors have been locked*4 | Front door lock with motor assembly LH | |
| Front door lock with motor assembly RH | ||
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Main body ECU (Multiplex network body ECU) | - |
Tech Tips
*1: for LHD
*2: for RHD
*3: w/ Double Locking System
*4: When the door unlock detection switch detects an unlock position signal after a door lock operation has been performed, a door lock operation will be performed 3 times.