Checking the ground terminals

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. 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.
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 the battery negative terminal and:

#53 (#A53) and #54 (#A54) on the breakout box

Other information:
- To connect the breakout box, see Connecting the breakout box .
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 for both readings.

OK
Refer to Checking the control module power supply
NOT OK
Refer to Checking for an open-circuit, contact resistance and oxidation