Tech Tips
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 functions do not operate | Front door lock with motor assembly LH*1 | |
| Front door lock with motor assembly RH*2 | ||
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Only driver door 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)*3 | - | |
| 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 | - | |
| Instrument panel junction block assembly | - | |
| Only rear door LH LOCK/UNLOCK functions do not operate. | Rear door lock with motor assembly LH | |
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Only rear door RH LOCK/UNLOCK functions do not operate. | Rear door lock with motor assembly RH | |
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Only back door open function does not operate. | Proceed to "Only Back Door cannot be Opened" | |
| 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*3 | Proceed to "All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch" | |
| All doors LOCK/UNLOCK functions do not operate via multiplex network master switch assembly and door key cylinder. | Instrument panel junction block assembly | - |
| Main body ECU (Multiplex network body ECU) | - | |
| Double locking function does not operate properly*4 | LIN communication system | |
| Front door lock with motor assembly LH | ||
| Front door lock with motor assembly RH | ||
| Rear door lock with motor assembly LH | ||
| Rear 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*5 | Front door lock with motor assembly LH | |
| Front door lock with motor assembly RH | ||
| Rear door lock with motor assembly LH | ||
| Rear door lock with motor assembly RH | ||
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Main body ECU (Multiplex network body ECU) | - |
*1: for LHD
*2: for RHD
*3: w/ Canister Pump Module
*4: w/ Double Locking System
Tech Tips
*5: 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.