J1939 - BENDIX VORAD VS-400 Installation Manual

J1939

Note: The J1939 data bus uses two (2) 120-ohm resistors to terminate each end of the data bus on the vehicle. These resistors must
remain in place for proper data bus communication. Due to the mounting location of the Forward Looking Radar, the closest of the
vehicle's J1939 terminators may have to be relocated nearer the radar as shown in the diagram below. Check the resistance of the
data bus using an ohmmeter before and after adding any device to the bus. With the ignition key in the OFF position, the resistance
of the data bus should read approximately 60-ohms (120 / 2).
Terminating
resistor
Note: The illustration above shows J1939/11, however J1939/15 (2-wire) can be used.
Pin #
J1-3 J1939_SHIELD
J1-4 CAN_HI
J1-5 CAN_LO
Electrical Requirements
J-1939/11 data link
(OEM supplied)
Description
5
4
3
Shield
termination
_
+
GND
J1
Terminating
resistor
27