Checking the Ground Terminal

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Disconnecting Control Unit

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off
• Main unit disconnected.
• Switch off all equipment that takes power from the battery (courtesy lighting, radio etc).

  Connect an ohmmeter between terminal #26 on the breakout box and the battery negative terminal.

  Fig 3: Breakout Box

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 4: Identifying Ohmmeter

  Courtesy of VOLVO CARS OF NORTH AMERICA.

The ohmmeter should read approximately 0 Ω. 

• OK 

  OKAY:  Troubleshooting has been completed.

• NOT OK 

  Refer to Checking For Open-Circuits, Contact Resistance And Oxidation