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Home >> Volvo >> 2010 >> S40 Base, 2.4 39, Automatic >> Repair and Diagnosis >> Electrical >> Gauges >> Global Positioning System (GPS), Phone Module (PHM), Subwoofer (Sub) Module, Traffic Message Channel (TMC) Module Diagnostic Trouble Codes (544 Body) >> PHM-0063: Illumination Buttons Signal Too High/Signal Missing (2009-2012) >> Fault-Tracing >> Fault-Tracing >> Checking The Component
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Checking The Component

Change the switches for Volvo On Call. Check that the lighting in the switches works by altering the lighting intensity on the buttons.

Other information 

Fig 1: Identifying Volvo On Call Buttons
GLL128668Courtesy of VOLVO CARS OF NORTH AMERICA.

Does the lighting work?