Scan Tool Connection (to 6/00)
Starting with the 1995 750iL, and soon after on all 1996 model year BMW vehicles, a separate OBD II Diagnostic Link Connector (DLC) was added.
The DLC provides access for an aftermarket scan tool to all emission related control systems (DME, AGS/EGS and EML). This diagnostic communication link uses the existing TXD II circuit in the vehicle through a separate circuit on the DLC when the 20 pin cap is installed.