User Manual

©
Scania CV AB 2013, Sweden
CAN interface for bodywork
Requirements for CAN communication with the vehicle
11:90-01 Issue 1 en-GB 133 (139)
Connectors and cables
Scania does not use SAE J1939 connectors. Scania uses twisted pair cables (twisted
40 times per metre) with no shield or sheath. The electrical properties (resistance, im-
pedance, capacitance etc.) are defined in SAE J1939-15 Physical Layer Light. Scania
uses a cross-sectional area of 0.75 mm² for cables inside the cab and 1.5 mm² on the
frame. CAN connectors (and ECU pins) outside the cab should preferably be gold-
plated. The following colours and markings apply to the external CAN bus cables:
CAN_H must be blue and CAN_L must be white. In order to avoid misunderstanding
it is important that the cables retain their colour for the lifetime of the vehicle. CAN-
low must be called (marked) CAN_L and CAN-high must be called (marked)
CAN_H.
• Connection to the external network inside the cab: CAN_H must be connected to
connector C259 pin 21 and CAN_L must be connected to connector C259 pin 20.
• Connection to the external network outside on the frame: CAN_H must be con-
nected to connector C487 pin 6 and CAN_L must be connected to connector C487
pin 7.
Note:
If the connection to the external network is only carried out inside the cab, the factory
installed jumper from connector C259 pin 21 and connector C259 pin 20 to connec-
tor C494 pin 6 and connector C494 pin 7 must be removed. There will then be no
unused and unterminated CAN cabling running from the DIN connectors on the
frame (C487-6 and C487-7).
IMPORTANT!
No other connector or CAN bus may be connected. An incorrect connection could
cause the vehicle's normal functions to behave unpredictably. There is a risk that the
vehicle will stop and have to be recovered.
C259
BWS
1
2
ECU X
ECU Z
ECU Y
C487
< 30 m
< 3 m
> 0,1 m
LHD 6,0 m
RHD 8,5 m
330 513
1. Bodywork control unit with termination resistors
2. Control unit in the bodywork with termination resistors