Steering Column Lock

Steering Column Lock

General Information

The electronic steering column lock control module (J764) locks the steering column. It is not attached permanently to the steering column and can be replaced separately if faulty.

It is not necessary to replace the steering column if the electronic steering column lock control module is faulty, except in the Audi A6, Audi Q7 and the Audi A8.

The comfort system central control module (J393) assumes the diagnosis for the electronic steering column lock control module under the address "05 - access/start authorization". The LIN-bus transmits the data to the access/start authorization switch (E415).

System Overview

Both electronic steering column lock release wires on the comfort system central control module and vehicle electrical system control module (J519) must detect the supply voltage in order to lock the steering column for the electronic steering column lock control module. Both control modules for the unlock duration must switch terminal 30 to the wires.

If a "terminal 15 request" is present for the comfort system central control module, then it must be determined if the steering column has actually unlocked before switching terminal 15.

This takes place as follows:

• The comfort system central control module inquires after it receives a terminal 15 request from the electronic steering column lock control module via the LIN-bus.

• If the steering column was unlocked successfully, then this will be communicated to the comfort system central control module via the discreet wire "release terminal 15". The release wire remains controlled while the electronic steering column lock control module is unlocked.

• The comfort system central control module controls the terminal 15 relay after the release has occurred.

Steering Column Locking and Unlocking

The control module unlocks the steering column when:

- The key is inserted into the access/start authorization switch.

- Terminal S is activated by pressing the access/start authorization switch on the keyless entry system

The control module locks the steering column when:

- The key is removed.

- The door is opened via the keyless entry system

The following conditions must be met before the steering column can lock:

- The ignition must be turned off.

- Terminal S must not be recognized.

- The vehicle must be standing.

Service Information

The discrete wires are diagnosed by the comfort system central control module and the vehicle electrical system control module and can be checked in Guided Fault Finding.

Selection "46 - Comfort system central module | J393 " "05 - electric components (=> in -J393)" "J764 - electronic steering column lock control module (Repair Group 48)"

• "J764 - electronic steering column lock, release electronic steering column lock (Repair Group 48)" for the discrete wire "electronic steering column lock - release" from the comfort system central control module to the electronic steering column lock control module.

• "J764 - electronic steering column lock, release terminal 15 (Repair Group 48)" for the discrete wire "release terminal 15" from the electronic steering column lock control module to the comfort system central control module.

Selection "09 - electronic central electric | J519 " "09 - partial system conditions"

• "J519 - vehicle electrical system control module, release steering column lock" for the discrete wire "steering column adjustment - release" from the vehicle electrical system control module to the electronic steering column lock control module.

• "16 - calibrating the steering angle sensor - G85, (Repair Group 94)" must be performed after replacing the steering column. The electronic steering column lock control module can remain in the vehicle and does not need to be adapted again.

• "* * - servicing immobilizer" must be performed only if the electronic steering column lock control module is replaced.