Are you using a BAFX Products PIC18F2480 Bluetooth OBD2 adapter, commonly known as the Bafx Elm327 Bluetooth Obd2 Can V1.5, and looking for a simple modification? Many users appreciate this adapter for its reliable connection with apps like Torque Pro, especially when paired with devices like the Galaxy S3. One minor drawback for some is that the adapter draws constant power from the OBDII port, even when the vehicle is off, potentially leading to battery drain over extended periods. This guide will walk you through a straightforward 15-minute modification to convert your BAFX adapter to switched 12V power, ensuring it only operates when your car is on or in accessory mode.
This modification is particularly useful if you, like many users, want to eliminate the constant power draw. The design of the BAFX adapter is quite accommodating for DIY enthusiasts. Its relatively large size, around 3 inches in length, provides ample space for easy access and modifications. The robust casing even includes a convenient hole with a rubber plug, hinting at its mod-friendly design. This guide focuses on relocating the power source to a switched accessory circuit.
Here’s a step-by-step process to modify your BAFX ELM327 Bluetooth OBD2 CAN V1.5 adapter for switched power:
Step 1: Accessing the Internals
First, you’ll need to open the adapter casing. Locate the blue label on the device. Beneath this adhesive label are four screws. Carefully peel off the label to reveal these screws. Using a small screwdriver, remove all four screws to access the internal components of your BAFX ELM327 Bluetooth OBD2 CAN V1.5 adapter.
Step 2: Disconnecting the Connector
Once the screws are removed, gently separate the two halves of the adapter casing. Inside, you’ll see a white connector linking the OBDII port to the internal circuit board. Carefully unplug this white connector from the PC board. This disconnection is necessary to safely access and modify the wiring of the OBDII connector.
Step 3: OBDII Connector Removal
With the white connector detached, you can now lift the OBDII connector assembly completely out of the adapter’s shell. This provides clear access to the pins and wiring of the OBDII connector, making the next step, wire relocation, much easier to perform.
Step 4: Wire Relocation (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 typically the wire providing constant 12V power, while pin 8 is often connected to the switched ACC 12V circuit. In most OBDII connectors, pin 16 is located at the top left, and pin 8 is at the bottom left when viewed from the front (wire side). Carefully move the wire currently connected to pin 16 and relocate it to pin 8. This effectively switches the power source for your BAFX ELM327 Bluetooth OBD2 CAN V1.5 adapter.
Step 5: Reassembly
After relocating the wire, place the OBDII connector back into its position within the adapter shell. Reconnect the white connector to the PC board, ensuring it is firmly seated. Carefully align the two halves of the adapter casing and reassemble them, securing them with the four screws you removed earlier. Be cautious during reassembly to avoid bending the five LEDs located on the board.
Step 6: Final Touches
Finally, you can choose to reapply the blue label or leave it off, depending on your preference. Your BAFX ELM327 Bluetooth OBD2 CAN V1.5 adapter is now modified for switched power. It will function exactly as before, but will only power on when your vehicle’s ignition is turned on or in the accessory position. This simple modification effectively prevents unnecessary battery drain, offering peace of mind and preserving your car’s battery life. Enjoy the enhanced, battery-conscious performance of your modified BAFX OBD2 adapter with your favorite OBDII apps!
