Many car enthusiasts and DIY mechanics use OBD2 adapters for vehicle diagnostics. The BAFX Products PIC18F2480 Bluetooth OBD2 adapter is a popular choice due to its solid performance and broad compatibility. While it works excellently out of the box, some users prefer to modify it for switched 12V power, meaning it only powers on when the car is running or in ACC mode. This modification is straightforward and can be completed in about 15 minutes with minimal effort. This guide will walk you through the simple steps to convert your Bafx Obd2 Diagnostic Interface to switched power.
Why consider this modification? By default, the BAFX OBD2 adapter draws power continuously. While the draw is minimal, some users prefer to eliminate any parasitic drain on their car battery, especially if the adapter is left plugged in for extended periods. Switching to ACC power ensures the adapter is only active when the vehicle is in use, aligning with many users’ preferences and use cases, particularly when using apps like Turbo3’s.
Here’s how to easily modify your BAFX OBD2 diagnostic interface for switched power:
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Accessing the Internals: Begin by removing the blue label on the adapter to reveal the four screws holding the case together. Unscrew these four screws to open the device.
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Disconnecting the Connector: Carefully separate the two halves of the adapter case. You’ll see a white connector plugged into the PC board. Gently unplug this white connector.
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Pin Repositioning: With the connector detached, you can now lift the OBDII connector out of the case. Locate pin 16 (full-time 12V) and pin 8 (switched ACC 12V). In most layouts, pin 16 is on the top left, and pin 8 is on the bottom left, making for an easy wire move. Carefully move the wire from pin 16 to pin 8.
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Reassembly: Place the OBDII connector back into the case and re-plug the white connector into the PC board. Carefully reassemble the two halves of the case, ensuring you don’t bend the LEDs. Secure the case with the four screws. You can choose to reapply the label or leave it off.
Your BAFX OBD2 diagnostic interface is now configured for switched power. It will function identically to its original state but will only power on when your vehicle is on or in ACC mode. This modification is a simple yet effective way to manage power consumption and tailor your BAFX OBD2 adapter to your specific needs.
