Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2013 Toyota Prius ThreeFACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
WARNING: This page is about a different variant/trim than selected.
HINT:
- 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.
POWER DOOR LOCK CONTROL SYSTEM
| Symptom | Suspected Area | Refer to |
|---|---|---|
| Only Driver Door LOCK/UNLOCK Functions do not Operate | Front door lock assembly (for Driver door) | Refer to INSPECTION |
| Wire harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Only Front Passenger Door LOCK/UNLOCK Functions do not Operate | Front door lock assembly (for Front passenger door) | Refer to INSPECTION |
| Wire harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Only Rear Door LH LOCK/UNLOCK Functions do not Operate | Rear door lock with motor assembly LH | Refer to INSPECTION |
| Wire harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Only Rear Door RH LOCK/UNLOCK Functions do not Operate | Rear door lock with motor assembly RH | Refer to INSPECTION |
| Wire harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| All Doors LOCK/UNLOCK Functions do not Operate Via Master Switch, Driver Door Key Cylinder | LIN communication system | Refer to All Doors LOCK/UNLOCK Functions do not Operate Via Master Switch, Driver Side Door Key Cylinder |
| Multiplex network master switch assembly | - | |
| Front door lock assembly (for Driver door) | - | |
| Wire harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch | Door control switch assembly | Refer to All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch |
| Wire harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Only Back Door cannot be Opened*1 | Back door lock assembly | Refer to Only Back Door cannot be Opened |
| Certification ECU (Smart Key ECU Assembly) | - | |
| Back Door Opener Switch Assembly | - | |
| CAN Communication Line | - | |
| Wire harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | - | |
| Only Back Door cannot be Opened*2 | Smart key system (for Entry function) | Refer to Back Door Entry Unlock Function does not Operate |
- *1: w/o Entry System Back Door Open Function
- *2: w/ Entry System Back Door Open Function
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.