Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2004EXPRESS 1500 RWD V6-4.3L VIN XREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDATA LINK CONNECTORDESCRIPTION AND OPERATION
2004 Chevrolet Express 1500 RWD V6-4.3L VIN X
Data Link Connector: Description and Operation
2004 Chevrolet Express 1500 RWD V6-4.3L VIN XSECTION Description and Operation
DATA LINK CONNECTOR (DLC)
The data link connector (DLC) allows a scan tool to communicate with the class 2 modules. The DLC is a standardized 16 cavity connector located below the instrument panel and close to the steering column. Connector design and location is dictated by an industry wide standard, and it is required to provide the following:
- Scan tool power battery positive voltage at terminal 16.
- Scan tool power ground at terminal 4.
- Class 2 serial data signal at terminal 2.
- Common signal ground at terminal 5.
Refer to Data Link Communications Connector End Views.
The data link connector (DLC) allows a scan tool to communicate with the class 2 modules. The DLC is a standardized 16 cavity connector located below the instrument panel and close to the steering column. Connector design and location is dictated by an industry wide standard, and it is required to provide the following:
- Scan tool power battery positive voltage at terminal 16.
- Scan tool power ground at terminal 4.
- Class 2 serial data signal at terminal 2.
- Common signal ground at terminal 5.
Refer to Data Link Communications Connector End Views.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.