What does the OBD fuse do?

Blown OBD Socket Fuse The OBD port or socket also known as DLC (Data Link Connector) provides power to your scan tool. When the check engine light is missing too, you can bet you found the reason your scan tool won’t power up.

Do you need a fuse for the OBDII port?

But, I believe that the “C4” version of SDS (the wifi version most shops have now) has its own power supply, so it can talk to the car’s systems over OBDII without that fuse. The older C3 version of SDS (with the RS232 breakout box), like most generic OBDII scanners, does require power from the OBDII port. One more update to this thread.

Why is the OBDII port on my 1999 e320 not working?

My 1999 E320 has a dead 16 pin OBD II port under the dash – it died a couple weeks ago shortly after I had plugged my wi-fi transmitting code reader into it and was getting ready to read the codes on my Iphone when I lost signal. I assumed that the transmitter in the code scanner had failed, not the port itself.

Where is the OBDII port on a Mercedes Benz?

It is at the passenger side under the module box lid. Remove the lid (4 bolts), find the K40 fuse / relay module. It is fuse-1 (7.5 amp). The rightmost fuse as you look from the front of the car. It is at the passenger side under the module box lid. Remove the lid (4 bolts), find the K40 fuse / relay module.

Why do I get No OBD code on my car?

Blown Fuse If you’ve plugged into your car’s diagnostic port and aren’t reading anything, you might think that your OBD-II brain has been fried, but don’t declare it dead yet. The most common reason for getting no OBD code is simply a blown fuse.

Where are the fuses for the OBDII port?

Thanks. Check fuse #62, under the hood. Check fuse #62, under the hood. Click to expand… Thanks for that suggestion. I just double checked the fuses under the hood in the compartment with the 38 pin port and the diagram only shows fuses up to #45 under the hood or under the back seat.

Where is the diagnostic port on a Mercedes Benz?

In case this ever happens to someone in this forum there is a fuse titled “Diagnostic Port”, for my particular model is bay number 62 (15 AMPS fuse). I knew where the fuse box is located in my car (engine bay) but I noticed there is no diagram for the fuse assignment.

Where is the fuse on a 1999 e320?

My 1999 E320 is a W210, rather than a W203 as the OP, so the fuse layout is likely different. Thanks again. It is at the passenger side under the module box lid. Remove the lid (4 bolts), find the K40 fuse / relay module.