Diagnostic tester, connecting

Recommended special tools and equipment e.g.: 

Fig 1: VAS 5052 Vehicle Diagnostic And Service Information System With

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• VAS 5052 Vehicle Diagnostic and Service Information System with
• VAS 5052/3 diagnostic cable

Requirements 

Fig 2: Identifying Main Fuse Panel

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• The respective fuses of the Motronic fuel injection and ignition system must be OK:

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

• Battery voltage must be at least 11.5 volts.
• All electrical consumers such as, for example, lights and rear window defroster must be switched off.
• Parking brake must be engaged or else daylight driving lights will be switched on.
• For vehicles with automatic transmission, selector lever must be in -P-.

• If vehicle is equipped with an A/C system, it must be switched off.
• Ground (GND) connections between engine and chassis must be OK.
• Ignition switched off.

Work procedure 

Connect diagnostic tester (VAS 5052) using (VAS 5052/3) diagnostic cable as follows:

Fig 3: Locating DLC

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• Connect diagnostic cable connector to Data Link Connector (DLC) -arrow-.
• Depending on the desired diagnostic mode, it is necessary to:

switch on ignition

or

start engine. Refer to Selectable diagnostic modes under address word 33 - OBD