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.
The ignition coil operates according to the principle of a transformer. 2 coils are placed onto a shared ferric core. The primary coil consists of a thick wire with just a few windings. One end of the coil is attached to the positive terminal (terminal 15) of the vehicle voltage via the load-shedding relay terminal 15. The other end (terminal 1) is connected to the ignition output stage, which can use it to switch the primary current. The secondary coil consists of thin wire with many windings.
| Item | Explanation |
|---|---|
| 1 | Primary coil |
| 2 | Secondary coil |
| 3 | Spark plug |
PIN REFERENCE
| Pin | Explanation |
|---|---|
| Terminal 15 | Voltage supply (via load-shedding relay, terminal 15) |
| SIG | Ignition signal, terminal 1 |
| Kl. 4a | Earth connection |