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

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Fig 2: Disconnecting Connector

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Ignition off
Disconnect engine cooling fan (FC) relay 2/15
Ignition on.
Connect a voltmeter between engine cooling fan (FC) relay base terminal #1 and ground.

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

Fig 4: Identifying Voltage Display
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Fig 5: Identifying Integrated Relay/Fusebox
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The voltmeter should read battery voltage.

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

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition on.
Check the cable between engine cooling fan (FC) relay base terminal #1 and fuse 15. Check for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Fig 2: Identifying Integrated Relay/Fusebox
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Fig 3: Identifying Ohmmeter
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Fig 4: Identifying System Relay Base Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

Continue
Refer to Verification