Automotive functions typically controlled electronically include:

Engine ignition (spark, timing) Infotainment systems, Fuel injection, Braking (anti-lock brakes) Emissions controls Steering (steering assist, 4-wheel steering) Collision avoidance systems Seat & pedal positions Heating/air conditioning Communication systems Navigation systems Safety systems Suspension systems Noise cancellation Transmission controls Security systems Lights, horn, wipers, defrosters …

Current automobile designs have nearly 100 microprocessors 
Number of processors expected to double in 5 years.  A typical automobile contains about 5 miles of wiring.