CAN-Bus Wiring, Repairing

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.

CAN-Bus Wiring, Repairing

• Observe general notes for repairs on the vehicle electrical system => [ Vehicle Electrical System, General Information ].

• Observe the notes on wiring harness and connector repairs => [ Wiring Harness and Connector Repairs, General Information ] including identifying repair locations.

An unshielded two-strand wire - 1 and 2 - with a cross section of 0.35 mm2 or 0.5 mm2 can be used as CAN-Bus wiring.





• CAN bus wires have the following color coding:





• During repair work, both bus wires must have the same length. When twisting the wires - 1 and 2 - together, the - A - = 20 mm routing length must be maintained.

• While doing so, no section of wire must be greater than - B - = 50 mm without twisting of wires, e.g. in area of welded connectors - arrow -.