Relays of the junction box electronics
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 junction box electronics (JBE) have internal and external relays. The excitation coils on all relays are permanently supplied with a positive cable. The positive power supply for the external relays is provided via the load circuit which is to be switched through. The positive power supply of the internal relay lies on the secured supply cable of the junction box electronics. All relays are controlled via the negative lead. All internal relays and the relay for wiper stage 1 and wiper stage 2 are located downstream of the fuse on the current circuit. All other external relays of the junction box electronics lie in the current circuit before the fuse.
Internal relays are:
- Relay for power window drive, rear
- Relay for the central-locking drive (except for luggage compartment lid)
The external relays are:
- Relay for drive, rear window wiper
- Relay for headlight-cleaning system
- Relay for heated rear window
- Bistable relay (deactivation of closed-circuit current fault)