Checking the bus cable

Fig 1: Disconnecting Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Disconnect the ABS control module from the bus cable, pull the connector out from the control module.

  Measure resistance across terminals #10 and #11 (or #19 and #20).

  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. 

  NOTE:

  To obtain the correct value the battery must be disconnected during resistance measurement.

  Other information: 

  • If the car has a switch on the center console with the letters "DSTC", terminals #19 and #20 apply instead of terminals #10 and #11
  • The resistance should be approximately 120 Ohms. If another reading is given, there may be an open-circuit in the bus cable
  • To connect the breakout box to the ABS control module, see Connecting the ABS breakout box
  • To disconnect the battery, see Battery, disconnecting
  Fig 2: Identifying Ohm Meter

  Courtesy of VOLVO CARS OF NORTH AMERICA.

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

• YES 

  Refer to Replacing ABS control module 

• NO 

  Refer to Open-circuit in Control area network bus. High speed network. Permanent fault