For automotive enthusiasts and DIY mechanics, the Bafx Products Obd2 Diagnostic Interface is a valuable tool for reading vehicle data and diagnosing issues. Many users appreciate its compatibility and solid connection, especially when paired with diagnostic apps. However, a common concern with OBD2 adapters is their constant power draw, even when the vehicle is off, potentially leading to battery drain over time. This article provides a step-by-step guide on how to easily modify your BAFX Products OBD2 diagnostic interface for switched power, ensuring it only draws power when your vehicle is running or in ACC mode. This modification is straightforward and can be completed in about 15 minutes, offering peace of mind and preventing unwanted battery drain.
This guide is based on the popular BAFX Products PIC18F2480 Bluetooth OBD2 adapter, known for its positive reviews and broad compatibility. While this modification was performed on this specific model, the general principles may be applicable to other similar OBD2 adapters. Always exercise caution and ensure you understand basic electronics before attempting any modifications.
Step 1: Accessing the Internal Components
The first step involves opening the BAFX Products OBD2 diagnostic interface enclosure. Locate the blue label on the device. Beneath this label, you will find four screws securing the two halves of the casing. Carefully peel off the adhesive label to expose these screws. Using a small Phillips head screwdriver, remove all four screws.
Step 2: Disconnecting the PCB Connector
Once the screws are removed, gently separate the two halves of the BAFX Products OBD2 diagnostic interface casing. Inside, you will see the printed circuit board (PCB) with various components. Locate the white connector that attaches the OBDII connector to the PC board. Carefully unplug this white connector from the PCB. This disconnection is necessary to safely access the wiring of the OBDII connector.
Step 3: Removing the OBDII Connector
With the white connector unplugged, you can now easily lift the OBDII connector assembly completely out of the plastic housing. This provides clear access to the pins and wires of the OBDII connector, making the next modification step easier to perform.
Step 4: Wire Relocation for Switched Power
This is the crucial step for modifying the power source. The OBDII connector has several pins, each serving a specific function. Pin 16 is designated for constant 12V power, which is the default power source for the BAFX Products OBD2 diagnostic interface. We will be moving the wire from pin 16 to pin 8, which is typically designated for switched ACC 12V power in vehicles.
Looking at the OBDII connector, Pin 16 is located on the top left, and Pin 8 is on the bottom left. Carefully identify the wire connected to pin 16. Gently depin this wire from pin 16 and re-insert it into the pin 8 slot. Ensure the wire is securely inserted into pin 8 for a reliable connection.
Step 5: Reassembly
After relocating the wire, carefully place the OBDII connector back into its housing. Reconnect the white connector to the PC board, ensuring it is firmly seated. Now, reassemble the two halves of the BAFX Products OBD2 diagnostic interface casing and secure them with the four screws you removed earlier. Be cautious not to bend the five LEDs located on the PCB during reassembly.
Step 6: Final Touches
Once the device is reassembled, you can choose to reapply the blue label or leave it off. The modification is now complete. Your BAFX Products OBD2 diagnostic interface will now only receive power when your vehicle is turned on or in ACC mode, effectively eliminating constant power draw and preventing potential battery drain.
Step 7: Testing
Finally, test your modified BAFX Products OBD2 diagnostic interface in your vehicle. Connect it to your OBDII port and verify that it powers on and functions correctly when the ignition is on or in ACC mode, and powers off when the ignition is turned off. You can use your preferred OBD2 diagnostic app to confirm connectivity and data retrieval.
By following these steps, you’ve successfully modified your BAFX Products OBD2 diagnostic interface for switched power. This simple modification enhances the usability of your diagnostic tool and protects your vehicle’s battery from unnecessary drain, ensuring your BAFX OBD2 adapter is even more convenient and reliable for all your automotive diagnostic needs.
