Main task

The ignition switch (ISM) is linked with the column integration module (CIM) and the steering column lock (SCL) and has the following uses:

• Send the transponder code to CIM via the communication cable for identification.
• Send the key position to CIM via the communication cable for forwarding to the buses.
• Send the remote control battery status to the CIM via the communication cable in order to display a battery warning on the SID.
• Prevent the key being turned from LOCK to OFF before the transponder code has be approved and SCL unlocked.
• Prevent the key being turned from OFF to LOCK before the car has stopped and the selector lever has been moved to P (aut).
• Release the SCL locking pin via a direct lead prior to locking the steering column after a command on the communication cable from CIM.
• Find out via a direct lead from SCL that the locking pin is in unlocked and released position and send it to CIM on the communication cable.
• Illuminate the key positions.
• Provide a number of units with battery voltage via a direct lead in certain key positions.