Volkswagen New Beetle. Manual - part 778

Fig. 154: Identifying VAS 5051 Vehicle Diagnosis, Testing And Information System 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

TEST PREREQUISITES FOR OBD 

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The tires installed to all wheels must be of the same (approved) size; tires inflated to prescribed pressure.  

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Mechanical/hydraulic parts of the brake system including brake light switch and brake lights OK.  

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Hydraulic connections and lines are not leaking (visual check of hydraulic module, brake calipers, wheel 
cylinders, tandem brake master cylinder).  

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Wheel bearings and wheel bearing play are OK.  

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ABS Control Module (w/EDL) -J104- is correctly bolted to hydraulic unit -N55-.  

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Electrical connection is installed correctly to the ABS Control Module (w/EDL) -J104- (locking device is 
engaged correctly).  

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Check electrical connections of ABS components for damage and correct seating.  

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All fuses, according to wiring diagram OK. (remove fuse from holder to check).  

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Supply voltage OK. (at least 10.0 V)  

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Access to the OBD is only possible when the vehicle is stationary and ignition turned on (or engine 
running).  

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When checking the ABS system make sure that the vehicle electric system is not affected by 
electromagnetic interference, i.e. the vehicle is kept well away from equipment with a high current draw, 
e.g. from an electric welding module.  

SAFETY PRECAUTIONS 

 

2003 Volkswagen New Beetle GLS 

1998-2004 BRAKES On Board Diagnostic (OBD) - New Beetle

  

SCAN TOOL CONNECTING 

All functions which could previously be performed with V.A.G 1551/1552 can also be performed with the new 
tester VAS 5051 in the operating mode vehicle OBD. 

Connecting VAS 5051 

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With ignition switched off, connect tester VAS 5051 to Data Link Connector using diagnosis cable VAS 
5051/1 or VAS 5051/3.  

Selecting operating mode: 

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Press button on display for "Vehicle OBD".  

Selecting vehicle system: 

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Press "03 - Brake electronics" on display. 

WARNING:

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You must always secure testing and measuring equipment on the 
rear seat.  

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When vehicle is being driven, only a second technician operate this 
equipment.  

 

2003 Volkswagen New Beetle GLS 

1998-2004 BRAKES On Board Diagnostic (OBD) - New Beetle

  

Fig. 155: Connecting Tester VAS 5051 To Data Link Connector Using Diagnosis Cable VAS 5051/1 
or VAS 5051/3 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

The control module identification and coding are indicated on the display. 

Selecting diagnosis function: 

All diagnostic functions available are indicated on the display. 

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Press button on display for desired function.  

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Further measures see repair procedures. 

V.A.G 1551 SCAN TOOL, CONNECTING AND SELECTING FUNCTION 

Special tools and equipment 

NOTE:

The following test sequences are for V.A.G 1551 scan tool.

NOTE:

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All functions that have so far been carried out with V.A.G 1551 can now 
also be carried out with the tester VAS 5051.  

 

2003 Volkswagen New Beetle GLS 

1998-2004 BRAKES On Board Diagnostic (OBD) - New Beetle

  

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V.A.G 1551 scan tool 

Fig. 156: Identifying V.A.G 1551 Scan Tool 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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V.A.G 1551/3 or 1551/3A adapter cable 

 

2003 Volkswagen New Beetle GLS 

1998-2004 BRAKES On Board Diagnostic (OBD) - New Beetle