Starting system (SCL), brief description
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Starting system (SCL), brief description
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Column Integration Module, CIM (703a)
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Control module, E39 ECM (590)
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Unit, ignition switch, ISM (20)
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Transmission range switch/immobiliser switch, automatic (245/77)
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Switch, coupling, immobiliser (411)
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Underhood Electrical Centre, UEC (342)
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Starter motor
When the engine is started and the engine speed exceeds the starter motor rpm, the pinion is disengaged from its shaft via a free wheel. This prevents the starter motor from overrevving.
The starter motor is fitted on to the engine block. A solenoid engages a pinion with the ring gear on the engine flywheel.
Ignition switch
The starter motor is activated when the ignition key is in the Start position. The ignition lock unit reads the key transponder code and sends this on the K-line to the steering column control module (CIM).
Column Integration Module
When the transponder code is approved, the steering column module (CIM) sends a signal to the ignition switch to allow the key to turn.
Engine control module
Once the control module receives a ready signal from CIM via a bus message, it grounds the starter relay control coil. All conditions for immobilization must be fulfilled before the CIM can send a ready signal to ECM. See
Immobilization
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Gear selector, automatic
The gear selector on cars with automatic transmission allows start only when the selector lever is in position P or N.
Starting interlock contact, clutch pedal
Vehicles with manual gearboxes are equipped with a switch for the clutch pedal that does not allow the car to be started unless the pedal is in the depressed position.
