Note
The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before proceeding with troubleshooting, perform an on-vehicle inspection and confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*
*: w/o Canister Pump Module with Door Ajar Warning Buzzer Function
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) | - | |
| 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 assembly LH | |
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Only rear door RH LOCK/UNLOCK functions do not operate. | Rear door lock assembly RH | |
| Wire harness or connector | - | |
| Instrument panel junction block assembly | - | |
| Only back door open function does not operate. | Power Back Door System*3 | |
| Proceed to "Only Back Door cannot be Opened"*4 | ||
| All doors LOCK/UNLOCK functions do not operate | Proceed to "Power Source Circuit"*5 | |
| 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" | |
| 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*6 | LIN communication system | |
| Front door lock with motor assembly LH | ||
| Front door lock with motor assembly RH | ||
| Rear door lock assembly LH | ||
| Rear door lock 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*7 | Front door lock with motor assembly LH | |
| Front door lock with motor assembly RH | ||
| Rear door lock assembly LH | ||
| Rear door lock 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/ Power Back Door System
*4: w/o Power Back Door System
*5: w/o Canister Pump Module with Door Ajar Warning Buzzer Function
*6: w/ Double Locking System
*7: 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.