Structure and inner electrical connection
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 BMW X3, 2016 BMW X3, 2015 BMW X3, 2014 BMW X3, and 2013 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.
Resistors with a positive temperature coefficient (PTC) are designated as PTC resistors. The warmer the PTC becomes, the higher its resistance. With a PTC, high current flows at switch on, for example. With increasing heating, this level of current falls. Metals are PTC conductors. Their resistance increases with rising temperature.
| Index | Explanation |
|---|---|
| 1 | Heating element for engine ventilation heating |
Pin assignments
The engine ventilation heating is supplied by the junction box with terminal 15N. The Digital Diesel Electronics (DDE) activate the engine ventilation heating on the ground side.
| Pin | Explanation |
|---|---|
| Kl. 15N | Voltage supply, terminal 15N |
| Kl. 31E | Activation (ground), engine ventilation heating |