What is the location of DLC - 2012 Hyundai Elantra

Check the voltage in pin 16 of DLC 3. Hook a bulb type 12 v tester between terminal 16 of the dlc and ground. The bulb should glow even if the ignition key is off. If the bulb does not glow check the fuse located under the glove box on the passenger side.

Pull the carpet down from where it goes up into the console trim on the left
side of the shifter. Look back towards the heat vent, you'll see it! This is an
OBDI system, so it only has 3 wires going to it.

On 2002 Honda Truck Odyssey 3.5L MFI SOHC VTEC 6cyl the OBD Diagnostic Link Connector is located under the instrument panel in the driver's side. It is bolted to the kick panel and is gray in color on the 1998 and newer models.

Also refer to Haynes manual in the emissions and engine control system section .

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On GM and Fords it's on the lower left hand corner of the dashboard, underneath the dash. You may have to look closer to find it.
There may be a plastic cap on it concealing it from view.

It should be there:

Diagnostic Link Connector Fig. 1: The OBD-II compliant Data Link Connector (DLC) is located under the driver's side of the instrument panel
Fig. 2: A Tech 1® , or equivalent scan tool must be used to retrieve codes from the 16-pin DLC connector
These vehicles are equipped with a Data Link Connector (DLC) which is the 16-pin connector that you attach the scan tool to read and/or clear Diagnostic Trouble Codes (DTCs). The DLC is located under the driver's side of the instrument panel.

Data Link Connector The Data Link Connector (DLC) may be found in the following location:

• Under the driver's side dashboard, near the steering column.

The DLC is rectangular in design and capable of allowing access to 16 terminals. The connector has keying features that allow easy connection. The test equipment and the DLC have a latching feature to ensure a good mated connection.

PLEASE DON'T FORGET TO RATE!!!! Data Link Connector OBD II Systems use a standardized test connector called the Data Link Connector (DLC). It is located beneath the instrument panel somewhere between the left end of the instrument panel and 12 inches (300 mm) past the vehicle centerline.
The DLC is located out of the sight of vehicle passengers, but should be easily viewable by a technician from a kneeling position outside the vehicle. The DLC is rectangular in design, capable of accommodating up to 16 terminals and has keying features to allow for easy connection. The DCL and Scan Tool connector have latching features that ensure the Scan Tool connector will remain mated when properly connected. Some common uses of the Scan Tool are:

• To identify and clear any stored diagnostic trouble codes
  
• To read the serial data stream information (e.g., PID data)
  
• To perform Enhanced Diagnostic Tests (bi-directional Scan Tool)
  

Data Link Connector Graphic

both answers are correct for the "DLC", I believe the DCL is a function or error message indicating a communication problem with the Dashboard module and the PCM module. The DLC is located where "tedpineywood" said it is.

Fuse #5 10A Data Link Connector (DLC)
located in.

Passenger compartment fuse panel
The fuse panel is located on the left
hand side of the instrument panel
facing the driver’s side door. Pull the
panel cover outward to access the
fuses

With the advent of OBD-II, the Federal Government has mandated the location of the DLC (Data Link Connector) .The Data Link Connector is located in the passenger compartment. It is attached to the instrument panel and accessible from the driver's seat. The DLC is rectangular in design and capable of allowing access to 16 terminals. The connector has keying features that allow easy connection. The test equipment and the DLC have a latching feature to ensure a good mated connection. The Scan tool uses the DLC as a pathway to communicate with the on board computer system. If the DLC is not located under the dash, the vehicle is using OBD-I. This is a slightly different management system in its operation and diagnosis. Look for DLC under the hood near the left front headlight on the Town Car and Mark VII, near the right side firewall on the Continental.

The DLC (data link connector) on a 95 Grand Cherokee is under the hood on the right side near the firewall.