Checking the communication cable

WARNING: This page is about a different car, the 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Ignition On Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Connecting Control Unit

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off.
Connect control module.
Ignition on.
Connect a voltmeter between data link connector (DLC) terminal 7 and ground.

Fig 3: Identifying Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

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

The voltmeter should read approximately 9-11 V.

OK
Refer to Checking communication with the ABS system
LOW
Refer to Checking for a short-circuit
HIGH
Refer to Checking for a short-circuit