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The J1850 Automotive Multiplexing System is opening up new opportunities for automotive designers. Multiplexing not only reduces wiring, weight and cost; but is also adding features by sharing information among modules. For example a door module could communicate that the car is being unlocked and who is unlocking it. The body controller can use this information and tell smart seats and mirrors to adjust themselves to that driver's preferences; tell the radio to turn to a particular station and start the engine. The number of modules that are being multiplexed are increasing in both number and function. Everything from sophisticated engine controllers to simple actuator/sensor nodes are being multiplexed. The challenge with Multiplexing a large number of modules is how to make an integrated circuit that fits all their diverse needs.