Checking the bus cable

Fig 1: Identifying Control Module Disconnected

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Disconnect the suspension module (SUM) from the bus cable. Pull the connector out of the control module.
• To obtain the correct value, the battery must be disconnected during resistance measurement.

  Measure the resistance of the connectors across terminals #A15 and #A16.

  NOTE:

  Take care that you measure directly at the connector so that it is not damaged.

  HINT: Only connect a breakout box to the connector, not to the control module. In this way, the direction of any faults in the bus cable can be established. 

  The resistance must be approximately 120 Ohms. If another reading is given, there may be an open-circuit in the bus cable.

  Other information 

  • To connect the breakout box, see Connecting the breakout box
  • For further information about signals and other values, see Signal specification
  • To disconnect the battery, see Battery, disconnecting .
  Fig 2: Identifying Breakout Box

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 3: Identifying Ohmmeter

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Does the measuring instrument display a resistance of approximately 120 Ω? 

• YES 

  FAULT NOT FOUND:  Troubleshooting has been completed.

• NO 

  Refer to Open-circuit in the Control area network (CAN) bus. High speed network. Permanent fault