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Home >> Volvo >> 2012 >> XC90 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Control Modules - Signal Specifications >> Signal Specification, Phone Module (PHM) (2003-04) >> Signal Specification >> Notes

Signal Specification: Notes

NOTE: It is important to connect the breakout box and check ground terminals before taking readings.

There may be several connections and connectors between the control module and components.

For further information about:

U= DC voltage in volts (V) UAC = AC voltage in volts (V)
Ubat = Battery voltage (V) f = Frequency in Hertz (Hz)
Ulow = Voltage approximately 0 V t = Time in seconds
PWM = Pulse width modulated signal as a % - -