BMW 3: Low-voltage connections
In the low-voltage connector at the Electrical Machine Electronics the following lines and signals are combined:
- Terminal 30 from the hybrid power distribution box
- Terminal 30 from the front left power distribution box
- Terminal 30C (terminal 30 crash signal)
- Ground
- FlexRay bus system
- PT-CAN bus system
- K-CAN 5 bus system
- Input and output of the circuit of the high-voltage interlock loop (EME control unit evaluates the signal and initiates a shutdown of the high-voltage system in the event of an interruption to the circuit. Redundancy of battery management electronics (SME) )
- Actuation of the shutoff valve in the vehicle interior
- Activating the electrical vacuum pump
- Evaluation of the rotor position sensor at the electrical machine
- Evaluation of the temperature sensor at the electrical machine
- Intelligent battery sensor of auxiliary battery (LIN bus).
The Electrical Machine Electronics is connected to the 12 V vehicle electrical system (terminals 30 and 31) via two separate low-voltage connections and lines with large cross-sections. Via this connection the DC/DC converter in the Electrical Machine Electronics provides the entire 12 V vehicle electrical system with energy. These two lines are connected with the Electrical Machine Electronics via a screw connection.
The following graphic summarizes the low-voltage connections of the Electrical Machine Electronics in the form of a simplified wiring diagram:
G20 PHEV, low-voltage connections of the Electrical Machine Electronics
- Electric Motor Electronics (EME)
- Output stage for activating the combined expansion and shutoff valve
- Terminating resistor, FlexRay
- Signal lines of the high-voltage interlock loop
- Electrical machine (entirety)
- Temperature sensor
- Rotor position sensor
- Safety Battery Terminal (SBK)
- 12 V battery
- Intelligent Battery Sensor (IBS)
- Electrical vacuum pump
- Output stage for the activation of the electrical vacuum pump
- Unidirectional DC/DC converter
- Intelligent Battery Sensor (IBS2)
- Additional 12 V battery
- Safety Battery Terminal 2 (SBK2)
- Combined expansion and shutoff valve (interior)
READ NEXT:
High-voltage connections
At the Electrical Machine Electronics, there is a total of three high-voltage
connections to connect the
lines for other high-voltage components. The connections for the electric A/C
compressor and
High-voltage cables
The high-voltage cables connect the high-voltage components and are
identified by orange cable
sleeves. The manufacturers of hybrid cars have agreed on a uniform
identification of the high-voltage
c
Removing the flat high-voltage connector
Bridge for high-voltage interlock loop
Before the high-voltage connector can be
disconnected, the bridge for the high-voltage
interlock loop must first be removed. The bridge
closes the circuit
SEE MORE:
Interior lights
General information
Depending on the equipment version, interior
lights, footwell lights, entry lights, ambient lighting,
and speaker lighting are automatically controlled.
Overview
Buttons in the vehicle
Interior lights
Reading lights
Switching the interior lights
on/off
Press the button.
To swi
Procedure after an accident
The safety concept of the high-voltage system ensures that, even during or
after an accident, there
is no danger to the customer, the rescue services or the service employee. The
high-voltage system
is automatically switched off in the event of an accident in such a way that no
dangerous voltage
