Checking for open circuits, contact resistance and oxidation
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
Check the heater's ground point and wires connected to it for an open circuit as described in Open-circuit, permanent faults and Contact resistance and oxidation .
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Refer to Verification