Check the resistance in the signal cable

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 OFF

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Fig 2: Identifying Connector

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Fig 3: Disconnecting Control Unit

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Ignition off.
Wheel sensor disconnected.
Control module disconnected.
Connect an ohmmeter between the female half of the wheel sensor connector terminal 1 and the female half of the control module connector terminal:

7 (diagnostic trouble code (DTC) ABS-311), left front wheel.

5 (diagnostic trouble code (DTC) ABS-312), right front wheel.

9 (diagnostic trouble code (DTC) ABS-313), left rear wheel.

3 (diagnostic trouble code (DTC) ABS-314), right rear wheel.

Fig 4: Identifying 2-Pin Connector
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Fig 5: Identifying Ohmmeter
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Fig 6: Identifying Terminals
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The ohmmeter should read approximately 0 Ω.

OK
Refer to Checking the resistance in the ground lead
NOT OK
Refer to Remedy open-circuit