B1394 code definition
The B1394 trouble code detects an error with the power door memory lock relay circuit.
What the B1394 code means
The B1394 code is a generic OBD-II trouble code that signals a circuit malfunction from the power door memory lock relay. The power door memory lock system is a customizable system in the power door lock and unlock system. It allows the driver to choose when the system should automatically lock and unlock certain doors. For instance, the power door memory lock system can be used to automatically lock all of the doors when the vehicle eclipses 20 MPH, and to unlock only the driver’s door when the car is turned off. If a circuit error from the power door memory lock relay is detected by the powertrain control module (PCM) or the body control module, then the B1394 code will likely be stored.
What causes the B1394 code?
Causes of the B1394 include:
- Damaged wires in the power door memory lock system
- Damaged electrical components (such as connectors, harnesses, and fuses)
- Faulty circuit
- Defective power door memory lock relay
What are the symptoms of the B1394 code?
If the B1394 code is detected, then the power door memory lock system will probably be disabled. That means that all preset automatic lock and unlock settings will not be enacted.
How does a mechanic diagnose the B1394 code?
The B1394 code will be diagnosed using a standard OBD-II trouble code scanner. A certified mechanic will use the scanner to view the freeze frame data, assess the B1394 code, and check for the existence of other trouble codes. If multiple trouble codes are present, then they will need to be diagnosed in the order in which they are displayed. The mechanic will then reset the trouble codes, restart the vehicle, and see if the code remains present. If not, then it was probably inaccurately triggered, or may represent an intermittent issue.
If the B1394 code is still detected, then the technician will visually inspect the wires in the power door memory lock system, and replace any that are broken, frayed, or short. The connectors, harnesses, and fuses should also be checked at this point, followed by the input and output voltage of the circuit. The power door memory lock relay will then need to be inspected.
After any component is replaced or repaired, the trouble codes will be reset, the vehicle restarted, and the B1394 code checked for. This allows the technician to see as soon as the issue is resolved.
Common mistakes when diagnosing the B1394 code
The most common error when addressing this code comes from a failure to properly follow the OBD-II diagnosis protocol. Technicians should always abide by the protocol, as this helps guarantee inspections that are efficient, and repairs that are accurate.
Fully operative power door memory lock circuits and relays are commonly replaced because damaged wiring was never checked for.
How serious is the B1394 code?
The B1394 code won’t keep a car from being drivable, or cause any long term severe damage, though it will likely keep the power door memory lock system from working. It’s always a smart idea to have a vehicle inspected when any trouble code is detected.
What repairs can fix the B1394 code?
Potential repairs for the B1394 trouble code are:
- Wiring replacement or repair
- Replacement of fuses, connectors, and harnesses
- Replacement of the power door memory lock circuit or its components
- Power door memory lock relay replacement
Additional comments for consideration regarding the B1394 code
The B1394 code is only applicable to vehicles that have a power door memory lock feature.
Need help with a B1394 code?
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.
This article originally appeared on YourMechanic.com as B1394 OBD-II Trouble Code: Power Door Memory Lock Relay Circuit Short to Battery and was authored by Brady Klopfer.