Checking ground terminal

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.

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).
For the keypad/car phone module connect an ohmmeter between the battery negative terminal and #8 on the breakout box.

For the car phone box connect an ohmmeter between the battery negative terminal and #30 on the breakout box.

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