Checking wiring between "white" diagnostic connector and convertible top operation control unit -J256 — AUDI

Note:

This check must be performed if one of the following displays appears on the connected fault reader V.A.G 1551.

Rapid data transfer
Fault in communication link
Indicated on display:

or

Rapid data transfer
HELP
K-wire not switched to earth

or

Rapid data transfer
HELP
K-wire not switched to positive

Installation position of diagnostic connectors and wiring junctions K and L: In relay plate with fuse box in plenum chamber

Note:

Wiring between "white" diagnostic connector and convertible top operation control unit -J256 is routed via wiring junction K.

Checking K-wire

Switch off ignition.
Disconnect all wires of vehicle systems with self-diagnosis from wiring junction K.
Establish K-wire for convertible top operation control unit and connect to wiring junction K.

Notes:

Determine wiring colour if wires with different cable colours are connected to wiring junction K.

=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder

If wires of the same colour are connected to wiring junction K, use test box V.A.G 1598 A (resistance measurement) to establish wire.

Switch on ignition and enter address word 26 for "Electric roof actuation" again => Page
01-164
.

8G0959255 A autom. convertible top
⇒
If convertible top operation control unit identification appears on display of fault reader V.A.G 1551:

Fault is to be found in a different system with self-diagnosis capability

Establish other systems with self-diagnosis capability, connect them consecutively to wiring junction K and perform testing.

If control unit identification is still not displayed:

Remove convertible top operation control unit.

=> Electrical System; Repair Group 96; Servicing components of electrohydraulic convertible top actuator; Removing and installing convertible top operation control unit -J256
Electrical System
Servicing components of electrohydraulic convertible top actuator
Removing and installing convertible top operation control unit -J256

With ignition switched off, use adapter V.A.G 1598/11 to connect test box V.A.G 1598 A to connector of wiring harness for convertible top => Page
01-346
.

Check for open circuit and short to earth/positive in the following wiring.

White diagnostic connector · Wiring junction · Convertible top operation control unit · Test box V.A.G 1598 A
Contact · Contact · Socket
2 · K · 17 · 37

If necessary, eliminate open circuit in wiring/short circuit.

=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder