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Home >> BMW >> 2019 >> X3 M40i >> Repair and Diagnosis >> External Pages >> Different car >> Section 575 (Functional Descriptions - F25 - Cooling System, Engine Performance) >> Engine Performance - Functional Description >> Characteristic map thermostat >> Structure and inner electrical connection

Structure and inner electrical connection

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The characteristic map thermostat is connected via a two-pin plug connection.

The characteristic map thermostat is supplied with 12 V vehicle voltage by the engine control. Activation occurs by the engine control on the earth side.

Fig 1: Heating Resistor - Circuit Diagram
G09908717Courtesy of BMW OF NORTH AMERICA, INC.
Item Explanation
1 Heating resistor in characteristic map thermostat
PIN REFERENCE

Pin Explanation
Terminal 15N 12 Volts, power supply
SIG Activation heating resistor
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