Checking ground terminals

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Control Module Disconnected

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off.
• Control module disconnected.
• Turn of all equipment in the car that takes power from the battery (the interior lighting and radio etc).

  Connect an ohmmeter between #53 on the breakout box and the battery negative terminal.

  Fig 3: Identifying 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 

  Refer to Checking control module power supply 

• NOT OK 

  Refer to Checking for an open-circuit, contact resistance and oxidation