OBD2 Scanner Not Turning On

OBD2 Scanner Not Turning On (Fix OBD2 Blown Fuse Issue)

OBD2 Scanner Not Turning OnThe OBD2 is a vehicle system that was founded in 1996 to diagnose the whole car, and after diagnosis, it finds some of the inherent diagnostic trouble codes that need to be eradicated in order to make the car great again. The mini-computer in the vehicle constantly monitors and controls these sensors. However, there are a few subsequent deliverables in the port near the dashboard where the OBD2 scanning device is mounted to detect anything wrong in the junctures. Nonetheless, it measures all the insiders within the manufacturer’s optimum or safe range. Furthermore, the mini-computer note downs all the fault codes and is stored at the car’s ECU. In the meantime,  the overall diagnosis process needs to be maintained as well as there are no faults that could be left behind.

What is the OBD2 fuse?

The OBD2 fuse is the main peripherals of the working mechanism of the OBD2 system. A relatively standard error occurs in the system when you plug in the scanner to detect what is the cause of the OBD2 scanner not turning on. The Data Link Connector, one of the prime sources of doing the OBD2 work, generates extreme power to scan the car. A blown fuse is the tritest reason for the loss of electricity in the internal system. Consequently, replacing a blown fuse will be so much apparent in the minimum enclosures of the system.

OBD2 Fuse Location

There are multiple fuse boxes in the OBD2 system, and their location sometimes varies from car to car. Some cars are located under the hood, one in the trunk and another behind the dashboard. The OBD2 port, the DLC, destined accessory port all make an invertible inside of the OBD2 proceedings. Sometimes the fuse is secured inside the vehicle’s dashboard, making it easily accessible. The 12v port is a standard of legacy and sheer domination when the car is seeming at an increasing speed, and the engine works according to the OBD2 manuscript.

How To Examine the OBD2 Blown Fuse?

The most rapid and effective way to detect a blown fuse is to pull the fuse Apart. Most fuse boxes use a type-one fuse that can be controlled easily. Furthermore, these fuses are very small and can make unwanted errors in ripping apart the colored fuses. 

Tools you need

  • Smart Voltmeter
  • Internal conductive strip
  • Screwdriver or wrench 
  • Right fuse box 

Check the OBD2 port

First of all, I will examine the port of the OBD2 juncture and then look at the port’s terminal closely. Investigate the terminals and witness if the terminals have 4 and 16 combinations of attaching pins. The ground is called the 4-based illumination, and the other one is called the T16-based power generator. Check the tension of the terminals; if you find the tension too plummeted, then apply the metal tightening tool to strengthen the terminal legs. Check the OBD2 port

Measure the Voltage

Use the voltmeter to check the voltage of the fuses. The fuse diagram shows the power and ground generation. You need to connect one side with the positive side and the other one with the negative inverter. Check the ground and detached voltage of the fuse. Then check the DLC terminals that are the most sensitive part of the fuse. Check the damaged wiring and the electrical juncture if something faulty is in the understanding. The most damaged prone area is just under the dashboard, where the wirings are located.

Check the plug

In the third step, examine the scanner plug with authority; the pins are generally designed as straightforward. The pin must be bent so that it makes the fuse disabled from performing and fails to make contact with the vehicle’s port. The cable inside the ports must be checked in a decent manner. 

Check the fuse

As progress has been made, the scanner may be opened to check the fuse. Check the scanner fuse with a close eye as mismanagement in the combination of the scanner fuse and scanner plug as they make the trickiest and the most solvent type of management in the fuse port.OBD2 Fuse

How To Repair OBD2 Blown Fuse and turn on the OBD2 scanner again?

The repairing process of the OBD2 Blown Fuse is a straight-cut and simple method that can be performed at home by the car owner himself. Let us check the method of repairing the Fuse Blown. The easiest and quickest method is to check the malfunction indicator light(MIL). If any of the car peripherals are in trouble, the light will keep flashing to vigil the car owner. A defective OBD2 might be the bone of content between the fuse and the scanning device.

  • After determining the location of the OBD2 fuse, the next step is to inspect if it is well or has gone out of order. The DLC, OBD II, Accessory Port, and 12v Power Point needed to be checked and repaired if there were any kind of issues in these parts. You can also examine the necessary things like ratings, types, and applications precisely and precisely.
  • Check the main handle beside the fuse box that is situated at the rear end. Pull the cover down slowly and repair the wirings and sensors inside the box. Closely examine if there are any cracks, broken parts, or dents in the prime peripherals. 
  • In the final section, you need to replace the defective fuses and how you will determine which one has gone out of order. Do not worry; just check the fuse voltage and resistance and compare that with the chart that is given in the user’s manual. If the values are harmonious, then the fuses are okay.
  • If the fuses are out of order, then replace the fuse with a new one. Use the wrench to grab and pull the defective fuse from its place, and that’s how you solve the issues regarding the fuse.How To Repair OBD2 Blown Fuse and turn on the OBD2 scanner again


Following these methods, you can again turn on the OBD2 scanners within a moment. The leading cause of a defective scanner is the damaged fuse, and somehow if you get rid of the issue, then it will be a moment of bliss to make the OBD scanner turn on again. Just make sure that the process is followed in a surgical order.

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