For automotive enthusiasts and DIY mechanics utilizing OBDII diagnostic tools, the BAFX Products PIC18F2480 Bluetooth OBD2 adapter stands out as a reliable and well-regarded choice. Its compatibility and solid connection make it a favorite for apps like Turbo3’s. While the adapter works seamlessly, some users might prefer to modify it for switched 12V power, meaning it only powers on when the vehicle is running or in accessory mode. This modification is straightforward and can be completed in a short amount of time. This guide provides a step-by-step walkthrough for modifying your BAFX Products OBDII diagnostic interface for switched power, enhancing its functionality and integration with your vehicle’s electrical system.
This modification offers several benefits. By default, many OBDII adapters draw constant power from your vehicle’s battery, even when the car is off. While the draw is minimal, over extended periods, it could contribute to battery drain, especially in vehicles driven infrequently. Switching to ACC power eliminates this concern, ensuring the adapter is only active when the ignition is on. Furthermore, for those who prefer a cleaner setup or utilize OBDII extensions and Y cables, managing power consumption of connected devices becomes more streamlined.
Modifying your BAFX Products OBDII diagnostic interface for switched power is a simple process that requires minimal tools and time. Here’s how to do it in seven easy steps:
-
Accessing the Internals: Begin by removing the blue adhesive label on your BAFX OBDII adapter. Beneath the label, you will find four screws. Unscrew and remove these to open the adapter casing.
-
Disconnecting and Isolating the OBDII Connector: Once the screws are removed, carefully separate the two halves of the adapter casing. Inside, you’ll see a white connector attached to the PC board. Gently unplug this white connector to detach the OBDII connector from the circuit board. You can now lift the OBDII connector completely out of the adapter’s shell for easy access.
-
Wire Relocation for Switched Power: The key to this modification is relocating the power wire. Identify pin 16 on the OBDII connector, which carries the constant 12V power supply. Next, locate pin 8, which is designated for switched ACC 12V power. Carefully move the wire currently connected to pin 16 and insert it into the pin 8 slot. On the BAFX adapter, pin 16 is typically on the top left, and pin 8 is on the bottom left, making this a simple and direct wire move.
-
Reassembly: With the wire relocated to pin 8, place the OBDII connector back into the adapter shell. Reconnect the white connector to the PC board, ensuring it is firmly seated. Carefully reassemble the two halves of the adapter casing, aligning them properly.
-
Securing the Casing: Replace the four screws you removed earlier to securely fasten the adapter casing. Be mindful of the internal components, particularly the five LEDs, to avoid bending or damaging them during reassembly.
-
Labeling (Optional): You can choose to reapply the original blue label or leave it off, depending on your preference. Reapplying the label maintains the original look of the adapter.
-
Testing: The final step is to test your modified BAFX Products OBDII diagnostic interface. Connect it to your vehicle’s OBDII port and turn the ignition to the ‘ON’ or ‘ACC’ position. Verify that the adapter now powers on and functions correctly with your chosen diagnostic app, such as Turbo3’s App. It should now only be powered when the vehicle is on or in accessory mode, successfully completing the switched power modification.
By following these steps, you can easily modify your BAFX Products OBDII diagnostic interface to operate on switched power. This simple modification enhances the adapter’s efficiency and ensures it only draws power when your vehicle is in use, providing a more integrated and user-friendly experience for your automotive diagnostic needs.
