Self-Study Program

Tasks of the entry and start authorisation control unit J518

364_026

● Represents the system bus connection externally.

Is a convenience CAN bus user

● Communicates with the other components of the

entry and start authorisation system via a local

single-wire bus

● Reads the position of the ignition key in the entry

and start authorisation switch E415 via 2 discrete

lines and the single-wire bus

● Reads the position of the entry and start

authorisation button E408

(is only installed in combination with Advanced

Key)

● Activates the terminal relay for terminal 15 and

for terminal 75x

● Requests the engine control unit to start the

engine

● Activates the steering column locking and

unlocking motor

● Queries the automatic gearbox control unit J217

to determine whether the selector lever is

currently engaged in the P or N position.

● Enables "vehicle opening"

● Is the diagnostic interface for all components of

the entry and start authorisation system

● Acts as the master for the immobiliser IV vehicle

function

The entry and start authorisation control unit and

the steering column form a single unit, as in the

Audi A6 ‘05. The control unit is attached to the

steering column by tear-off screws, and cannot be

replaced separately. If it is necessary to replace the

entry and start authorisation control unit, the

steering column must also be replaced.