Do it yourself: installing a GPS system on my car without cutting a single wire

Installed Onelap Micro + which offers features such as engine start and stop alerts, GPS + LBS positioning, theft and towing alerts and more.

BHPian KarDIY recently shared this with other enthusiasts.

A GPS is a must in every car nowadays. Not only does it help you locate your car in case of theft, but if you have children who also drive your car, having a GPS is useful for keeping an eye on them. I am a person who takes care of both cases. I am very wary of my car being stolen and I have people other than me driving my car. That’s why I decided to buy a GPS for my car.

Before buying a GPS I listed the features I wanted. The most important feature I wanted was the remote engine block. I researched and looked into several GPS systems and finally decided to buy the Onelap Micro +. It included extra features such as engine start and stop alerts, GPS + LBS positioning, waterproofing, theft and towing alerts, driving history, driving analysis, speeding alerts, etc.

Now, the important thing with the remote engine block is that you need to cut a wire and insert the relay provided to do this. But how do you know cutting a thread is like setting fire to a guarantee. So after taking a look around I found a way to do it without cutting any strings. And the best part is that it’s pretty simple and anyone can do it by following simple steps.

If you are someone who understands best by watching the video, watch this.

Required tools

  1. Screwdriver set
  2. Ratchet / wrench set
  3. Pry tools
  4. Shrink tube
  5. Nippers
  6. One Micro + lap
  7. Pliers
  8. Insulating tape
  9. Multimeter / test bulb
  10. Zip-ties

Wiring diagram

Although the diagram shows the cutting line, we will not cut it.


1. Under the steering column are two crossheads and a 10-number nut. Unscrew the screws and nuts and keep them safely aside. (Note: To remove the nut, the lever must be opened so that it can be accessed.)

2. Remove the steering column cover using lever tools. Insert a pry tool where the top and bottom panel meet. We must open it so that we can access the socket from which we will draw energy. (Note: Avoid using a screwdriver to open the panels. Using a screwdriver will leave marks on the panel.)

3. Remove the bottom panel completely and patiently. The top panel is attached to a fabric for a better finish so you can’t remove it. Just turn it over and insert it into the space indicated in the instrument cluster.

4. Remove the plug in the steering column. Press down here and pull it back.

5. There are 4 wires here. Try for the positive wire. To check this, you can use a multimeter or a test bulb. To use a test bulb, connect one wire from the bulb to the wire in the socket and another to the car body for the negative. Once you find which wire is positive, test the rest of the wires to find the ignition wire. To do this, put the sockets back into the column and insert the bulb wire into the socket and connect it to a wire. Connect the other wire of the bulb to the negative. Now enter the key. Turn the key to ACC and check if the bulb turns on or not. My light bulb went on. Turn on the key and check if the light bulb turns on or not. My light bulb went on again. Now, turn the key back to ACC and check if the bulb comes on or not. My light bulb did not turn on. This means that the power cable is an ignition cable. (Note: If you can’t find the ignition wire, try other wires.)

6. Once we have found the ignition cable, we will remove the ignition cable from the socket. To remove the cord from the socket, use a flathead screwdriver and remove the lock on the top of the socket. Now, insert a pointed, pointed object like a safety pin and push the white colored lock onto the top of the cavity and pull the thimble out inside.

7. After pulling the ignition wire out of the socket, connect it to the green relay wire. The ideal way to connect it is to get a similar male thimble, but since I couldn’t find it, I simply inserted the relay wire into the thimble, wrapped it around the thimble and pressed the thimble firmly to connect the relay. Cover it with shrink tubing for safety.

8. To connect the other relay to the socket, you will need a similar thimble. You can go to the workshops to buy one. But I couldn’t find it nearby, so I went to a repair shop and took the whole plug from the garbage harness there.

9. After connecting the thimble to the socket, hook the lock from above and reinsert the socket.

10. The white wire of the relay will be connected to the positive pole of the battery and the red wire of the GPS will also be connected to the positive pole of the battery. So, to keep things simple, we’re going to join these two strands. Cut the red a little before the fuse, connect the white wire to it and fix with adhesive tape.

11. We will now connect the red wire to the fuse box to absorb power. Remove the panel on the right side to access the fuse box.

12. Now use the label on the back of the panel to find the fuse that will give power even if the ignition is off. Connect one wire of the test belt to the body and connect the other wire to the BCM fuse (this fuse worked for me), if the bulb lights then it is the correct fuse. (Note: Make sure the key is not in the slot when testing.)

13. Now to connect the wire to the fuse, we will use a fuse tap. Insert the red wire into the thimble of the fuse tap and with the help of a crimping pliers crimp the thimble correctly.

14. Remove the fuse from the fuse box, put the fuse on the fuse tap and replace the fuse tap in the fuse box. (On a lighter note, please don’t get confused.)

15. The orange wire will be connected to the fuse that turns on when the ignition is turned on. There is a dedicated fuse for this, use another fuse tap and connect the wire to the fuse tap. (Note: Test the fuse the way we tested the last fuse.)

16. Connect the yellow wire from the GPS to the yellow wire from the relay and seal it with electrical tape.

17. Connect the black wire to the car body. Unscrew a screw or bolt a little, wrap the wire and screw it back tightly.

18. Now connect the cable to the GPS and both lights should blink. This means that all connections are secure.

19. Before putting everything back in place, you will need to scan the barcode provided on the GPS to set up your GPS and use it. Fill in the vehicle details. Follow the steps in the app.

20. Tie zip ties to keep cable tidy. Tie the relay to the wire using a zip tie. Also tie the GPS with a cable tie.

21. Replace the fuse box panel.

22. Reposition the steering column panels, this would require a lot of patience.

23. Retighten both the Phillips screws and the nut.

With this, all your work is done. And your GPS is ready to go.

Here’s what BHPian Reinhard had to say about it:

Excellent stuff! Thanks for sharing friend. Well detailed and indeed a rather useful addition to any car. It is always difficult to find good benchmarks for such mods, because the article basically explains where the tracker is and how to get rid of it (if one is a thief, for example)

I have a GPS tracker on my to-do list for over a year. Let’s see if this thread with a good reference to the product you provided provides the final push I needed. Regards.

Check out BHPian’s comments for more insights and information.

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