Adverse Weather Light Mode
E197954
This light mode is used at speeds from 0 to 50 km/h if
the wipers have been on for more than two minutes and
the front fog lamps are not switched on.
Failsafe Light Mode
E197663
Failsafe mode is automatically activated if the HCM
diagnoses a fault in the system during the self-test. The
light distribution is the same in this case as for driving
light mode.
Communications Network
There are a total of Six data bus systems used on the
communication network:
•
HS-CAN (controller area network) bus
•
HS-CAN multimedia bus
•
Private HS-CAN bus
•
MS-CAN bus
•
LIN (local interconnect network) bus
•
ISO bus
The private HS-CAN is used for rapid, interference-free
data exchange.
The HS-CAN bus, the HS-CAN multimedia bus and
the private HS-CAN bus have a speed of 500 kBit/s.
The MS-CAN bus and the private MS-CAN bus have
a speed of 125 kBit/s.
The keyless vehicle module is connected with the radio
frequency receiver over an ISO bus.
A total of 8 terminating resistors are installed.
The two terminating resistors of the HS-CAN data bus,
120 ohms each, are integrated into the PCM (powertrain
control module) and the BCM (body control module).
Since both 120 ohm resistors are connected in parallel,
the total resistance is 60 ohms (measured at the DLC
(data link connector)). If a control unit is disconnected
from the network, 120 ohms must be present between
pin 6 and 14 at the DLC.
75
Service Training
(G1828300)
Communications Network
Lesson 4 – Electrical
