Diagnostic Trouble Code (DTC) Information PHM-0066

Condition 

Fig 1: Identifying SOS and ON CALL Switches

Courtesy of VOLVO CARS CORPORATION

The diagnostic trouble code (DTC) is stored if the phone module (PHM) detects a short-circuit to supply voltage in the signals for either the SOS or the ON CALL switch.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on (not key position 3) and when the battery voltage is between 9-16 V. The diagnostic trouble code (DTC) can only be diagnosed for a phone module (PHM) with Volvo On Call functionality.

Substitute Value 

• None.

Possible Source 

• Short-circuit to supply voltage in the cable between the phone module (PHM) and the SOS switch
• Short-circuit to supply voltage in the cable between the phone module (PHM) and the On Call switch.

Fault symptom[s] 

• Messages in the display.
• No or reduced Volvo On Call functionality.