The junction box in the E70 plays a central role. In the junction box, the distribution box and junction box electronics form a unit. The junction box electronics is the central gateway in the vehicle.
The junction box is located below the instrument panel in the passenger footwell. To reach the junction box, the cover below the instrument panel must be removed. After removing the mounting bolt on the junction box, the box can be folded down. This enables better access to the fuses and relays. The junction box consists of the distribution box and the junction box electronics.
The fuses and various firmly installed plug-in relays are located in the distribution box of the junction box. Depending on the vehicle equipment, the distribution box is fitted with different relays. The mounting for the junction box electronics is located in the junction box.
The junction box electronics are mechanically and electrically connected to the distribution box. The junction box electronics unit combines numerous functions in a single control unit. The junction box electronics unit is connected via a number of plug connections.
Graphic shows installation location in the E70
Index |
Explanation |
1 |
Junction box |
Block diagram for E70
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Junction Box Electronics |
2 |
Steering column switch centre |
3 |
Dynamic Stability Control |
4 |
Engine control unit |
5 |
Driver's exterior mirror (High) |
6 |
Passenger's exterior mirror (High) |
7 |
Door switching centre |
8 |
Footwell module |
9 |
Heater/air conditioning system |
10 |
Instrument cluster |
11 |
Seat module, front passenger |
12 |
Car Access System |
13 |
Seat module, driver |
A number of functions are provided in the junction box electronics. The junction box electronics unit processes multiple signals, which it makes available to other bus subscribers on the electrical system. It also performs control tasks. Depending on the equipment variant, the following functions or signals can be processed by the junction box electronics:
The junction box electronics enable a number of bus systems to communicate with one another. The junction box electronics unit provides the gateway function for the following bus systems:
The junction box electronics control and monitor the power windows together with the footwell module.
The junction box electronics unit detects the signals and makes them available to other equipment attached to the bus.
The junction box electronics are the executing control unit for the central-locking system. The JBE handles activation of all the central-locking drives. The following control combinations are possible:
The junction box electronics send a query to determine which seat module is installed. If the junction box electronics receive no check-back signal, it handles activation of the seat heating. The junction box electronics generate a pulse-modulated signal to activate the seat heating. If a seat module is fitted, the seat heating is activated directly by the seat module.
The junction box electronics control the mirror heating and heated washer jets.
The bi-stable relay is used to shut down terminal 30g-f if there is a closed-circuit current fault.
The junction box electronics unit detects the signals for the instrument cluster.
The junction box electronics detect signals from the DSC button.
The following information on the junction box is available for service staff:
Nearly all Car and Key Memory functions are programmed inside the vehicle itself.
No liability can be accepted for printing or other errors. Subject to changes of a technical nature