| System overview for steering column lock |
| A precondition for locking the steering column for the electronic steering column lock control unit -J764- is that supply voltage has been detected on both the electronic steering column lock enable wires of the convenience system central control unit -J393- and the onboard supply control unit -J519-. This requires that both control units switch terminal 30 to the corresponding discrete wires for the duration of the unlock. |
| If the convenience system central control unit -J393- has received a „terminal 15 request“, successful unlocking of the steering column must first be checked before terminal 15 is switched. |
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| Upon receiving a „terminal 15 request“, the convenience system central control unit -J393- queries the electronic steering lock control unit -J764- by way of a LIN bus message. |
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| If the steering column was successfully unlocked, this information is relayed to the convenience system central control unit -J393- via the discrete "enable terminal 15" wire. The enable wire remains active for the entire time that the electronic steering lock control unit -J764- is unlocked. |
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| When the enable has been issued, the convenience system central control unit -J393- activates the terminal 15 relay. |
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