For enthusiasts leveraging the convenience of Mini Obdii Android adapters for vehicle diagnostics, a common concern arises from these devices drawing continuous power, even when the vehicle is off. Many users appreciate the compact size and Bluetooth connectivity of these adapters, especially when paired with Android devices and apps like Turbo3 for real-time vehicle data. However, the constant power draw can potentially lead to battery drain over extended periods.
The following guide details a straightforward modification to convert your BAFX Products PIC18F2480 Bluetooth OBD2 adapter to operate only when your vehicle is powered on or in ACC (Accessory) mode. This ensures your adapter is only active when needed, eliminating any worry about unnecessary battery drain. This modification is easily achievable in about 15 minutes and requires minimal tools.
Why Modify for Switched Power?
The standard OBDII port provides constant 12V power on pin 16. While this is necessary for some diagnostic functions, for many users who primarily use mini OBDII Android adapters for monitoring or occasional diagnostics, constant power is not essential and can be a drain. By modifying the adapter to draw power from a switched source, typically pin 8 (ACC power), the adapter will only be powered when the car is running or in accessory mode. This offers several benefits:
- Prevents Battery Drain: Eliminates the risk of your car battery being slowly drained by the OBDII adapter when the vehicle is not in use.
- Increased Adapter Lifespan: Potentially prolongs the lifespan of the adapter by reducing unnecessary continuous operation.
- Peace of Mind: Removes the need to physically unplug the adapter after each use.
Modifying the BAFX PIC18F2480 for Switched Power: A Step-by-Step Guide
This guide provides clear instructions on how to modify your BAFX Products PIC18F2480 Bluetooth OBD2 adapter. Please exercise caution and ensure your vehicle is turned off during this process.
Tools and Materials:
- Small Phillips head screwdriver
Step 1: Accessing the Internals
Locate the blue label on your BAFX OBD2 adapter. Beneath this label are four screws securing the adapter housing. Carefully peel off the adhesive label to reveal these screws. Using your Phillips head screwdriver, remove all four screws.
Step 2: Disconnecting the Connector
Once the screws are removed, gently separate the two halves of the adapter housing. Inside, you will see a white connector linking the OBDII port to the PC board. Carefully unplug this white connector from the PC board.
Step 3: OBDII Connector Removal
With the connector unplugged, you can now lift the OBDII connector assembly completely out of the adapter’s plastic shell. This provides easy access to the wiring.
Step 4: Wire Relocation (Pin 16 to Pin 8)
Identify pin 16 and pin 8 on the OBDII connector. Pin 16, which carries the constant 12V power, is typically located on the top left when viewing the connector as shown in the image. Pin 8, designated for switched ACC 12V power, is located on the bottom left. Carefully move the wire currently connected to pin 16 and relocate it to pin 8. This is a simple wire move, not requiring cutting or soldering.
Step 5: Reassembly
Place the OBDII connector assembly back into the adapter shell and re-plug the white connector back onto the PC board. Carefully reassemble the two halves of the adapter housing and secure them with the four screws you removed earlier. Be mindful of the five LEDs inside the unit during reassembly to avoid bending them.
Step 6: Testing
You can now reapply the blue label if desired. The modification is complete. Test your mini OBDII Android adapter in your vehicle. It should now only power on when the ignition is turned to the “ON” or “ACC” position and power off when the ignition is turned off. Verify its functionality with your preferred Android OBDII app.
Conclusion
By performing this simple modification, you can ensure your mini OBDII Android adapter, like the BAFX Products PIC18F2480, operates only when needed, preventing battery drain and offering a more convenient and efficient user experience. Enjoy the benefits of on-demand diagnostics without the worry of continuous power consumption.
