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Signal Description, Audio Module (AUD)

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 %    
Fig 1: Identifying Connector C977
GLL154729Courtesy of VOLVO CARS CORPORATION
CONNECTOR C1

Breakout box terminal  Control module terminal  Signal type  Ignition on  Miscellaneous 
#1 #1 Speaker left front door (-) Analog output signal when the speaker is in use 0 - 19 V depending on control module output.
#2 #2 Center speaker (-) Analog output signal when the speaker is in use 0 - 11 V depending on control module output.
#3 #3 Speaker right front door (-) Analog output signal when the speaker is in use 0 - 19 V depending on control module output.
#4 #4 Speaker left rear door (-) Analog output signal when the speaker is in use 0 - 19 V depending on control module output.
#5 #5 Speaker right rear door (-) Analog output signal when the speaker is in use 0 - 19 V depending on control module output.
  #6 - -  
  #7 - -  
  #8 - -  
#9 #9 Speaker left front door (+) Analog output signal when the speaker is in use 0 - 19 V depending on control module output.
#10 #10 Center speaker (+) Analog output signal when the speaker is in use 0 - 11 V depending on control module output.
#11 #11 Speaker right front door (+) Analog output signal when the speaker is in use 0 - 19 V depending on control module output.
#12 #12 Speaker left rear door (+) Analog output signal when the speaker is in use 0 - 19 V depending on control module output.
#13 #13 Speaker right rear door (+) Analog output signal when the speaker is in use 0 - 19 V depending on control module output.
  #14 - -  
  #15 - -  
  #16 - -  
Fig 2: Identifying Connector Terminals
GLL104035Courtesy of VOLVO CARS CORPORATION
CONNECTOR C2

Breakout box terminal  Control module terminal  Signal type  Ignition on  Miscellaneous 
#1 #1 Headphones 1, left headphone Analog output signal when the headphones are in use  
#2 #2 Headphones 1, right headphone Analog output signal when the headphones are in use  
#3 #3 Headphones 2, left headphone Analog output signal when the headphones are in use  
#4 #4 Headphones 2, right headphone Analog output signal when the headphones are in use  
  #5 - -  
  #6 - -  
#7 #7 Headphones 3, left headphone Analog output signal when the headphones are in use  
#8 #8 Headphones 3, right headphone Analog output signal when the headphones are in use  
#9 #9 Headphones 4, left headphone Analog output signal when the headphones are in use  
#10 #10 Headphones 4, right headphone Analog output signal when the headphones are in use  
  #11 - -  
  #12 - -  
#13 #13 Headphones 1, signal ground U = Ulow  
#14 #14 Headphones 2, signal ground U = Ulow  
#15 #15 Headphones 1 and 2, signal ground buttons U = Ulow  
#16 #16 Headphones 1, control signal buttons Analog input signal when buttons for track selection and source are used U = 5.0 V (no headphone panel connected)
U = 4.02 V (no button activated)
U = 3.16 V (previous track)
U = 2.37 V (next track)
U = 0.9 V (select source)
#17 #17 Headphones 2, control signal buttons Analog input signal when buttons for track selection and source are used U = 5.0 V (no headphone panel connected)
U = 4.02 V (no button activated)
U = 3.16 V (previous track)
U = 2.37 V (next track)
U = 0.9 V (select source)
#18 #18 Headphones 3, signal ground U = Ulow  
#19 #19 Headphones 4, signal ground U = Ulow  
#20 #20 Headphones 3 and 4, signal ground buttons U = Ulow  
#21 #21 Headphones 3, control signal buttons Analog input signal when buttons for track selection and source are used U = 5.0 V (no headphone panel connected)
U = 4.02 V (no button activated)
U = 3.16 V (previous track)
U = 2.37 V (next track)
U = 0.9 V (select source)
#22 #22 Headphones 4, control signal buttons Analog input signal when buttons for track selection and source are used U = 5.0 V (no headphone panel connected)
U = 4.02 V (no button activated)
U = 3.16 V (previous track)
U = 2.37 V (next track)
U = 0.9 V (select source)
Fig 3: Identifying Connector C442
GLL154727Courtesy of VOLVO CARS CORPORATION
CONNECTOR C3

Breakout box terminal  Control module terminal  Signal type  Ignition on  Miscellaneous 
  #1 30-feed Ubat  
  #2 Ground Ulow  
Fig 4: Identifying Connector MOST (Optical Signal)
GLL153820Courtesy of VOLVO CARS CORPORATION
CONNECTOR C4

Breakout box terminal  Control module terminal  Signal type  Ignition on  Miscellaneous 
  #1 MOST input signal   Optical input signal when the MOST network is activated
  #2 MOST output signal   Optical output signal when the MOST network is activated
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