For users of OBD2 diagnostic tools, the BAFX Products PIC18F2480 Bluetooth OBD2 adapter is a popular choice, praised for its solid connection and broad compatibility. Many enthusiasts appreciate its size, which allows for easy handling and potential modifications. One common modification is to convert the adapter to switched power, meaning it only draws power when the vehicle is on or in accessory mode, preventing battery drain. This guide will walk you through the simple process of modifying your Bafx Obd2 Diagnostic Interface for switched 12V power. This modification is straightforward and can be completed in about 15 minutes.
Step-by-Step Modification Guide
Here’s how to modify your BAFX OBD2 diagnostic interface to operate on switched 12V power:
Step 1: Open the Adapter
First, you’ll need to access the internal components of the BAFX OBD2 adapter. Locate the blue label on the adapter casing. Beneath this label, you will find four screws. Carefully peel off the adhesive label and use a small screwdriver to remove these four screws.
Step 2: Disconnect the Connector
Once the screws are removed, gently separate the two halves of the adapter casing. Inside, you will see a white connector linking the OBDII connector to the PC board. Carefully unplug this white connector from the PC board.
Step 3: Remove OBDII Connector
With the white connector detached, you can now lift the OBDII connector completely out of the adapter’s shell. This provides easy access to the pins for the next step.
Step 4: Move the Wire (Pin 16 to Pin 8)
This is the core of the modification. Identify pin 16 and pin 8 on the OBDII connector. Pin 16 is responsible for providing constant 12V power, while pin 8 is typically used for switched ACC 12V power. In most BAFX OBD2 adapters, pin 16 is located on the top left, and pin 8 is on the bottom left. Carefully move the wire currently connected to pin 16 and insert it into pin 8.
Step 5: Reassemble
After moving the wire, place the OBDII connector back into the adapter shell. Reconnect the white connector to the PC board, ensuring it is securely plugged in. Carefully reassemble the two halves of the adapter casing and secure them using the four screws you removed earlier. Be cautious not to bend the five LEDs during reassembly.
Step 6: Test
Finally, you can reapply the blue label if desired, or leave it off. Your BAFX OBD2 diagnostic interface is now modified for switched 12V power. It will function as before, but will only be powered when your vehicle is turned on or in ACC mode. Test the adapter to ensure it is working correctly with your preferred OBD2 applications, such as Turbo3’s App, confirming power is only supplied when the ignition is on.
Conclusion
Modifying your BAFX OBD2 diagnostic interface for switched power is a simple and effective way to prevent potential battery drain. This quick 15-minute modification ensures your adapter only draws power when needed, maintaining your vehicle’s battery health while still providing reliable OBD2 diagnostics when you need them.
