Many users appreciate the BAFX Products PIC18F2480 Bluetooth OBD2 adapter, available on Amazon, for its reliable connection and compatibility, especially with apps like Turbo3 and Galaxy S3. Its robust build and larger size are also seen as advantages for accessibility and potential modifications. One common modification is to convert the adapter to switched Accessory (ACC) power, preventing it from constantly drawing power from your car battery when the ignition is off. This guide will walk you through the simple steps to perform this modification in about 15 minutes.
Step-by-Step Modification Guide
This modification involves rerouting the power source of your BAFX OBD2 adapter from the constant 12V supply (pin 16) to the switched 12V ACC supply (pin 8). This ensures the adapter only powers on when your car is running or in ACC mode.
Step 1: Open the Adapter Casing
First, locate the four screws holding the adapter casing together. These screws are hidden beneath the blue label on the device. Carefully peel off the adhesive label to expose the screws. Use a small screwdriver to remove all four screws and set them aside.
Step 2: Separate and Disconnect the Unit
Once the screws are removed, gently separate the two halves of the adapter casing. Inside, you’ll see a white connector linking the OBDII connector to the PC board. Carefully unplug this white connector from the PC board to detach the OBDII connector assembly.
Step 3: Access Pin 16 and Pin 8
With the connector detached, you can now lift the OBDII connector entirely out of the unit’s shell. Examine the connector pins. Pin 16, which is the full-time 12V power supply, is located on the top left. Pin 8, the switched ACC 12V, is on the bottom left. The modification involves moving the wire from pin 16 to pin 8.
Step 4: Wire Relocation
Carefully move the wire currently connected to pin 16 and insert it into the pin 8 slot. This is a straightforward move as they are adjacent on the connector. Ensure the wire is securely placed in the pin 8 position.
Step 5: Reassemble the Adapter
Place the OBDII connector back into the shell and reconnect the white connector to the PC board. Carefully reassemble the two halves of the casing, ensuring you don’t bend the five LEDs on the board. Secure the casing with the four screws you removed earlier.
Step 6: Test and Verify
At this stage, you can choose to reapply the blue label or leave it off. Your Amazon Bafx Obd2 adapter is now modified for switched power. It will only power on when your car ignition is turned on or in ACC mode. Test the adapter with your preferred OBD2 app to confirm it functions correctly. It should now operate exactly as before, but only when the car is powered, effectively preventing any battery drain when the vehicle is off.
