Note
The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing troubleshooting, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*
*: w/ Door Control Battery
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 | - | |
| All doors LOCK/UNLOCK functions do not operate via door key cylinder | Main body ECU (Multiplex network body ECU) | |
| Front door lock with motor assembly LH*1 | ||
| Front door lock with motor assembly RH*2 | ||
| Wire harness or connector | ||
| All doors LOCK/UNLOCK functions do not operate via master switch | Lin communication system | |
| Multiplex network master switch assembly | ||
| Main body ECU (Multiplex network body ECU) | ||
| All doors LOCK/UNLOCK functions do not operate via door control switch*4 | Main body ECU (Multiplex network body ECU) | |
| Door control switch assembly | ||
| Wire harness or connector | ||
| Instrument panel junction block assembly | ||
| 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) | - | |
| Speed-sensitive automatic door lock function does not operate (meter/gauge system operates normally)*5 | CAN communication system | |
| Main body ECU (Multiplex network body ECU) | - | |
| Shift-linked automatic door lock/unlock functions do not operate (automatic transaxle system operates normally)*5 | CAN communication system | |
| Main body ECU (Multiplex network body ECU) | - | |
| ECM | - | |
| Key lock-in prevention function does not operate | Front door courtesy light switch assembly (for LH) | |
| Front door courtesy light switch assembly (for RH) | ||
| Rear door courtesy light switch assembly (for LH) | ||
| Rear door courtesy light switch assembly (for RH) | ||
| 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 | ||
| Instrument panel junction block assembly | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Lock operation continues even after doors have been locked*6 | 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) | - | |
| When returning to the vehicle, although door unlock operation was not performed, doors were in an unlocked state. | Main body ECU (Multiplex network body ECU) | |
| When returning to the vehicle, although door lock operation was not performed, doors were in a locked state. | Main body ECU (Multiplex network body ECU) |
Tech Tips
*1: for LHD
*2: for RHD
*3: w/ Key-linked 2-step Unlock Function
*4: w/ Canister Pump Module
*5: w/ Auto Lock Function
*6: 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.