How to Wire the OBD2 Connector?

September 24, 2021 2 min read

Do you need to connect to your car’s computer for diagnosing issues and analyzing its efficiency? You surely need to learn to wire OBD2 Connectors.

It is a complex process and must require proper wiring connections to bring it to working conditions. This is what we share in today’s article.

Understanding pins of the OBD 2 connectors:

Before wiring up the connector with your vehicle’s PCM or other devices, it is important that you know what pins would be integral in connection formation. So, here are they:

Pin 2 – serial data line

Pin 4 and Pin 5 – Ground line

Pin 10 and Pin 16 – source battery

These are all the pins you need for establishing a connection. However, in some cases, your vehicle’s PCM might have the other wires, so you can connect them with the other pin ports too. But without any of these essential wire connections, you will not be able to communicate with your PCM, which makes all these pins essential.

Wiring of the OBD 2 connector:

Step 1: Hook up pin 4 and Pin 5 (ground wires) to form a single wire. In a few cases, it might work separately. But if the equipment does not allow it, it can create problems in communication. Once hooked, you can connect it with PCM.

Step 2: Pin 2 will go to port 58 on the blue connector on the PCM

Step 3: Connect Pin 10 and 16 to 12V battery source. This current has to be constant. It must not be considered as an alternate to the primary power source.

With all these wires set up, your OBD2 connector is in place to read and write data to and from your vehicle’s PCM.