Analog Input Signals

BATTERY VOLTAGE  - Battery voltage is monitored by the cluster and a fault is stored if the voltage exceeds 16 volts.

FUEL TANK LEVEL  - Two lever action sensors are wired in parallel to the cluster. The two varying voltage signals are processed by the cluster for fuel gauge and low fuel warning display.

Fig 1: Identifying Analog Input Signals Flow Chart (Fuel Tank Level)

Courtesy of BMW OF NORTH AMERICA, INC.

OUTSIDE TEMPERATURE SENSOR  - A NTC sensor is used to measure the ambient temperature. The signal is processed by the cluster and passed out over the K Bus to modules requiring this input for processing.