B1393 code definition
The B1393 trouble code notes a circuit malfunction with the power door memory lock relay.
What the B1393 code means
The B1393 code is a standard OBD-II trouble code that detects an issue with the power door memory lock relay circuit. The Power door memory lock system is an automatic system that can be customized by the driver to control when the power doors are locked and unlocked. This system can be customized to lock the doors when the car reaches a certain speed, unlock a single door when the vehicle is placed in the Park position, and many other things. If the powertrain control module (PCM) or body control module not an abnormal voltage signal from the power door memory lock relay circuit, then the B1392 trouble code may be triggered.
What causes the B1393 code?
The B1393 trouble code can be a result of:
- damaged wiring in the power door lock system
- damaged connectors or fuses
- a circuit malfunction
- a faulty power door memory lock relay
What are the symptoms of the B1393 code?
The B1393 trouble code usually means that the power door memory lock system will not work. Any memory lock or unlock settings will likely fail to operate.
How does a mechanic diagnose the B1393 code?
The B1393 code should be diagnosed using an OBD-II trouble code scanner. A reputable mechanic can use the scanner to view the freeze frame data and assess the code, and also to check for additional trouble codes that may be present. If there are numerous codes detected, then the will need to be addressed in the order that they are displayed in. Next, the trouble codes will be reset, and the vehicle restarted, so the mechanic can see if the B1393 code remains detected. If it does not, then it was likely the result of an intermittent error, or possible an erroneous trigger.
If the B1393 code is still detected, then the technician will visually inspect the power door lock wires, and repair or replace any damaged wires. While inspecting the wiring, the connectors and fuses should be visually inspected as well. Next, the circuit will be checked, and then the power door memory lock relay should be tested.
Whenever the mechanic repairs or replaces a component, the trouble codes should again be reset, the vehicle restarted, and the B1393 code looked for. This will allow the mechanic to know when the problem has been fixed.
Common mistakes when diagnosing the B1393 code
The most common mistake when diagnosing this code is the failure to follow the OBD-II trouble code diagnosis protocol. It is imperative that the protocol always be adhered to be mechanics, as it helps guarantee a thorough and efficient diagnosis, and a repair that is devoid of erroneous replacements.
Properly working power door memory lock circuits are frequently unnecessarily replaced because the wiring was not first inspected.
How serious is the B1393 code?
The B1393 trouble code will likely impact the power door memory lock system, though it won’t cause any drivability concerns. Still, the vehicle should be inspected as soon as the code is noticed.
What repairs can fix the B1393 code?
Common repairs for the B1393 trouble code are:
- Power door lock wires repair or replacement
- Power door memory lock relay replacement
- Power door memory lock circuit replacement
- Replacement of connectors and fuses
Additional comments for consideration regarding the B1393 code
This code will only appear in vehicle that have the power door memory lock feature.
Need help with a B1393 code?
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This article originally appeared on YourMechanic.com as B1393 OBD-II Trouble Code: Power Door Memory Lock Relay Circuit Open and was authored by Brady Klopfer.