Control Units in the Engine Compartment
The electronics box is in the right housing under the cabin microfilter.
The electronics box contains the following control units:
• Digital engine electronics DME (one for 8-cylinder engines, two for 12-cylinder engines)
• Valvetronic VVT
• Integrated supply module (IVM) with fuses
The positive terminal and some fuses for the VVT system are readily accessible in front of the electronics box, level with the wheel arch.
The engine compartment also houses:
• Control unit for Dynamic Stability Control (DSC)
• Wiper module
Electronic Box Cooling Fan (E-Box Fan)
The E-box develops very high temperatures caused by engine heat and the energy dissipated by the control units. The ECM controls an electric cooling fan in the base of the electronic box to draw in cool air from the passenger compartment.
Since electronic control modules need to operate at a reduced temperature, the air temperature in the E-box must be kept as low as possible.
Lower temperatures extend the life expectancy of electronic control modules.
Control Units Behind the Dashboard
Control Units Inside the Passenger Compartment
Control Module Changes in 03/2005
Adaptive Directional Headlights and Light Module (AHL and LM)
When adaptive directional headlights were introduced, it was necessary to connect the AHL control unit to the PT-CAN.
The AHL control unit will be removed from the vehicle in 03/2005 because this function is to be taken over by the LM light module. The light module receives the information from the PT-CAN (yaw rate, road speed and steering angle) via a direct PT-CAN connection.
MOST
The KHI headphones interface KHI and LOGIC7 control units have changed places in the MOST ring.
PT-CAN
Active Cruise Control II ACC II is used instead of Active Cruise Control ACC.
K-CAN S
The RDC control unit was removed because the tire monitoring function was taken over by the Run Flat Indicator software in the DSC.
Dropping of the KHA module (headphones connection) as a control unit on the K-CAN.
The jacks of the headphone connections for rear-compartment entertainment are connected directly to the KHI (headphones interface).
MOST
Extended to to include the SDARS (Satellite Digital Audio Radio Services) control unit.
This module is located in left side of trunk attatched to underside of rear deck.
byteflight
The satellites are connected directly to the SGM (Safety and Gateway Module) through integration of the SIM in the gateway module. The star structure of the byteflight has been retained. The SGM serves as the main gateway for the entire bus system.
PT-CAN
The PT-CAN has been extended to include the a second DME control unit. This was deemed necessary when the 12-cylinder engine was introduced in the 760i/iL.
Control Units Inside the Luggage Compartment
Luggage Compartment, Left
Luggage Compartment, Right
