Checking the power supply

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Disconnecting Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off
Disconnect air conditioning (A/C) relay 2/10
Ignition on.
Connect a voltmeter between air conditioning (A/C) relay base terminal #1 and ground.

Fig 3: Identifying Air Conditioning (A/C) Relay Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

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

The voltmeter should read battery voltage.

OK
Refer to Checking the signal cable
NOT OK
Refer to Checking the signal cable