Diagnostic Trouble Code (DTC) Information PHM-0008

Condition 

Fig 1: Identifying Phone Module (PHM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

The diagnostic trouble code (DTC) is stored if the phone module (PHM) registers an open-circuit in the signal from the reserve microphone or a short-circuit to supply voltage in the signal. The reserve microphone is located behind the panel containing the SOS and ON CALL switches. The reserve microphone is used when a Volvo On Call service is connected and the phone module (PHM) does not have access to the microphone for the audio module (AUD).

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 

• Open-circuit in the cable between the phone module (PHM) and the reserve microphone
• Short-circuit to supply voltage in the cable between the phone module (PHM) and the reserve microphone.

Fault symptom[s] 

• Messages in the display
• The microphone is not working.