The provision for communicating with the ecm is the data link connector dlc figure 1 1. Iso 14230 4 iso 9141 2.

Ssm Wiring Diagram Wiring Diagram
Dlc wiring diagram. It is part of the mefi engine wiring harness and is a 10 pin connector which is electrically connected to the ecm. The dlc or data link connector is an obd ii 16 pin standard connector used in all automobiles manufactured since 1996. 20 ies gasoline 147hp 1998. 1996 to 1999 vortec 43505774l harness schematics and info. In todays vehicles its in constant communication with the can or computer area network. Diagnostic link connector dlc diagram cover types some manufacturers use covers to protect the integrity of the connector pins andor to prevent impact with vehicle passengers in an accident.
It provides a standard connection for automotive technicians to tap into and diagnose different onboard computers. Camarofirebird corvette capriceimpala roadmaster. 1999 to 2007 vortec 485360 harness wiring info tons of info here please read all the pages linked. Should be suitable for most modern gm cars buick cadillac chevrolet daewoo gmc holden opel vauxhall. Iso 14230 4 iso 9141 2. It is used in the assembly plant to receive information in checking that the engine is operating properly before it leaves the plant.
Most gm cars produced in 1996 2003 use j1850 vpw interface. Model engine year starting from obd 2 protocol. 1992 to 1997 lt1 57 and l99 43 wiring harness info includes. 2007 to 2009 vortec 48536062 harness information new harness modification info added 1162012. The following diagrams provide an example of some of the covers that manufacturers have used.