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The OBD (On-Board Diagnostics) system in a 2001 Nissan Pathfinder is powered by the vehicle's battery and is controlled by the Engine Control Module (ECM). If the OBD port isn't lighting up your reader, it could be due to a blown fuse.
In your Pathfinder, the OBD fuse is located in the fuse box under the dashboard on the driver's side of the vehicle. The fuse you need to check is the 10A fuse labeled "ECM" or "ECU". You can consult your vehicle owner's manual or the fuse box cover for the exact location of the ECM fuse.
If the ECM fuse is intact, there may be a problem with the OBD system itself or the wiring connecting it to the ECM. In that case, it's best to have a qualified mechanic or technician diagnose the issue to prevent further damage to your vehicle.
On the 1996 Pontiac Grand AM, in the inside fuse panel, which is on the drivers side of the cabin, the Fuse LTR, meaning the Cigarette Lighter also powers the OBD-2 Port, aka the DLC which stands for the:
''Data Link Connection''
You may have a blow fuse. If the scanner will not connect to the cars computer. or will not power up, That is very likely. Look in your fuse block for a fuse labeled ROOM. check to see if it is blown.
On Board Diagnostics. There is a data link connector (DLC) inside the fuse box. you hook up an OBD code reader to this DLC and it will communicate with the engine computer and retrieve stored trouble codes in the computer´s memory.
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