Scan Tool Connection: Notes

Starting with the 1995 750iL, soon after on all 1996 model year and later 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:

• ECM - Engine Management Monitored Emissions Functions/Components
• TCM (AGS/EGS) -Transmission Control
• EML - Electronic Throttle Control

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.

Fig 1: Identifying Scan Tool Connection

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The DLC Connector bridging cap is marked "OBD II  " and is found:

Fig 2: Identifying DLC Connector Bridging Cap

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Fig 3: Identifying E38 Center Console

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