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)
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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:
Drive-ready state
Switching on drive-ready state
Depress the brake pedal.
Press the Start/Stop button.
Switching off drive-ready state
Steptronic transmission:
1. Engage selector lever position P with the vehicle
stopped.
2. Press the Start/Stop button.
The engine is switched off.
3. Set the parking brake.
Aut
General information
The vehicle is supplied with two vehicle keys
with integrated key.
Each vehicle key contains a replaceable battery.
Depending on the equipment and country version,
various settings can be configured for the
button functions.
A driver profile with personal settings can be assigned
to a vehicle key
