Ignition switch unit (20)
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Ignition switch unit (20)
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Ignition switch unit (20)
The ignition switch (ISM) is linked with the column integration module (CIM) and the steering column lock (SCL) and has the following uses:
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Send the transponder code to CIM via the communication cable for identification.
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Send the key position to CIM via the communication cable for forwarding to the buses.
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Send the remote control battery status to CIM via the communication cable in order to display a battery warning on SID.
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Prevent the key being turned from LOCK to OFF before the transponder code has be approved and SCL unlocked.
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Prevent the key being turned from OFF to LOCK before the car has stopped and the selector lever has been moved to P (aut).
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Release the SCL locking pin via a direct lead prior to locking the steering column after a command on the communication cable from CIM.
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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.
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Illuminate the key positions.
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Provide a number of units with battery voltage via a direct lead in certain key positions.
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ISM is a unit that contains the following components:
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Ignition switch with four positions, LOCK, OFF, ON and ST, and a switch to indicate that the key is inserted.
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Solenoid to prevent the key from being turned from LOCK to OFF and from OFF to LOCK.
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Transponder antenna for identifying the key transponder.
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Illumination for key positions.
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Pin No.
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Signal type
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Description
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2
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Communication cable
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Communication with CIM.
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Key transponder code to CIM.
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SCL locking pin in unlocked and secured position to CIM.
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Release SCL locking pin, command from CIM.
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Brightness value for key positions from CIM.
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3
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+X
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Signal and supply to
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4
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Ground
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Power supply
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5
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+30
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Power supply
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6
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+B
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Wake-up signal to CIM.
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10
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Locking pin is in unlocked and secured position.
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Hall sensor value. Signal from SCL.
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11
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Release locking pin.
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Signal to SCL.
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12
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+15
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Signal and supply to
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All P-bus control modules.
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Supply to LEDs for PPS in control panel, SID
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Underhood electrical centre (UEC).
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Rear electrical centre (REC).
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Fuse box in instrument panel.
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Power supply
Output +15
Output +X, T8
Output +X, Simtec
Output +X, ME9
Output +X, EDC16
Communication with CIM
Communication with steering column lock
