Where is the 16-pin data link connector on 2002 chev tracker?

You mean a scan tool or code reader ? You hooked it up where ? DLC - diagnostic link connector near - under the steering column ? Cadillac what ? Deville - Seville - Eldorado etc... Do you know how to do electrical testing with a DVOM - digital volt ohm meter ? If you did something to pin #2 in the DLC , shorted ! that will cause this problem . Pin #2 is for class 2 serial data bus network . All the modules on the vehicle communicate on this circuit . Pin's 4 & 5 are ground , pin 16 is battery voltage . Your best bet is probably to take your vehicle to a ASE certified repair shop .

Data Link Connector (DLC) Pin
Wire Color
Circuit No.
Function
1
--
--
Not Used
2
PU
1132
Class 2 Serial Data
3
--
--
Not Used
4
BK
1050
Ground
5
BK/WH
1851
Ground
6-15
--
--
Not Used
16
OG
640
Battery Positive Voltage

old post
the isuzu car in uSA, only has this port.
its a USA invention an began in 1996 (some cars 2 years early short list)
the OBD2 is in the cab. of car. near center of the steering wheel (by law in usa)
most cases its at drives knees, just under dash lip.
if someone didnt move it (my trick)
on my cars i have and extension cable there to passenger side so we can scan and log data.

in this case they hid it nice, behind glove box.
and is 16pin D-shell female conn. with 12vdc on pin 16 if power is missing on this pin, the scan tool will be INOP
see here.

USA? what country?
RHD or LHD (right or left hand drive)?????
all usa cars, the 16pin DLC is less than 1meter from the steering wheel.
yours is behind the ash try(pull it)
some old honda's here, usa have dual ways to get scan codes.
the obd2 way , and obd1 way, RTM
read the FSM. or google for that.
I use ,alldata.com for fast answers, saving google searches and bad answers on forums...

fsm quote.
The 16-pin On Board Diagnostic version II (OBD-II) compliant Data Link Connector (DLC) is used to access the Diagnostic Trouble Codes (DTCs) using an OBD-II compliant Data Scan Tool (DST). It is an electrical connector with a gray housing located under the dash, either near the center console, on the passenger side of the vehicle or to the left of the driver side of the vehicle.
The two wire electrical connector with a blue housing next to the DLC is the Service Check Connector (SCS).

we (uSA have 2 DLCs. one is OBD2 and other is SCS.

id use a real scan tool. and not fool with the old winky blinky bs.
the scan tool you can check all live sensor data.
do that. and win.
1st goggle hit on SCS
http://honda-tech.com/showthread.php?t=2703528

The protocol is class 2 . Maybe your code reader is no good .
012 GM Class II Communications

Data Link Connector (DLC)
The data link connector (DLC) contains the following serial data links:
• Class II
• Entertainment and Comfort (E&C)
The DLC also provides a power source for the scan tool as follows:
• Unswitched voltage (B+) at DLC terminal 16 (circuit 1450)
• Ground at terminal 4 (circuit 1450) and terminal 5 (circuit 1550)

Class II Serial Data Link
The class II serial data link allows the following modules to communicate data with each other:
• Body control module (BCM)
• Electronic brake traction control module (EBTCM)
• Heater-A/C control (if equipped with RPO CJ2)
• Instrument panel cluster (IPC)
• Powertrain control module (PCM)
• Inflatable Restraint Sensing and Diagnostic Module (SDM).
The Class II serial data link allows a Scan Tool scan tool to communicate with the above modules for diagnostic and testing purposes. The Class II serial data link is located at the DLC connector terminal 2. Terminal 2 consists of the following circuits:
• Circuit 1036
• Circuit 1037
• Circuit 1128
• Circuit 1049
• Circuit 1122
• Circuit 1132
Entertainment and Comfort (E&C) Serial Data Link
The entertainment and comfort (E&C) serial data link allows a scan tool to communicate with the radio or the mobile telephone handset the remote CD player (if equipped). This communication is for diagnostic and testing purposes. The E&C serial data link is located at the DLC connector terminal 14, circuit 835.
PIN #9 goes to the air bag module .

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 .

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

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.

Hi!!

The OBD Diagnostic Link Connector is located in front seating area, passenger side, under dash, above kick panel, mounted rear of glove compartment.

Don't forget to rate this post, Good Luck!!

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

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.