Vehicle Electrical System, General Information

Wiring Harnesses and Connectors

Special tools, testers and auxiliary items required

• Wiring Harness Repair Kit (VAS 1978) with

• Upgrade kit (VAS 1978/50)

• or Wiring Harness Repair Set (VAS 1978A)

• The Upgrade Kit (VAS 1978/50) is required to bring the "old" Wiring Harness Repair Kit ( VAS 1978) up to the new standard of the Wiring Harness Repair Set (VAS 1978A).

CAUTION!
• Wiring harness and socket repairs may only be carried out with the Wiring Harness Repair Kit (VAS 1978) or Wiring Harness Repair Set (VAS 1978A).

• Observe the country-specific requirements.

• Usage of the Wiring Harness Repair Kit (VAS 1978 ) or Wiring Harness Repair Set (VAS 1978A) is described extensively in the accompanying usage instructions.





• Repairs on open circuits and faulty connectors are also explained using examples.

Vehicle Electrical System, General Information

CAUTION!
Risk of injury.

• Pay attention to stickers designating high voltage components. Prior to performing repairs, residual voltage must first be discharged.

• Some tools are supplied with a tool safety clip, which is slid over the tool points after using the tool, in order to protect other workers from injuries and tool points from damage.

CAUTION!
• Observe country-specific requirements.

• By disconnecting battery ground (GND) wire, safe work on vehicle electrical system is guaranteed. With the ignition switched off, disconnect battery ground cable.

• Before starting a repair, the cause of the damage must be eliminated first, i.e. sharp edges on chassis parts, faulty consumers, corrosion etc.

• If possible, do not loosen ground (GND) straps from body (danger of corrosion).

• Further information, e.g. installing and removing the individual components, is described in the appropriate repair information.