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Pinpoint Test D : No Sound From All Speakers

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  1. Audio System/Navigation - AM/FM/CD/SYNC for schematic and connector information.

    Normal Operation and Fault Conditions 

    A short to ground or voltage in the circuitry to one of the speakers may cause multiple speakers to lose sound due to the built-in overload protection feature of the ACM. In this case, a speaker fault DTC sets.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ACM B150C:55 Automobile Audio Bus (A2B) Node 1: Not Configured Sets continuous and during the self-test when the ACM detects a fault trying to communicate to the DSP.
    ACM B150C:87 Automobile Audio Bus (A2B) Node 1: Missing Message Sets continuous and during the self-test when the ACM detects a fault trying to communicate to the DSP.
    ACM B150C:8F Automobile Audio Bus (A2B) Node 1: Erratic Sets continuous and during the self-test when the ACM detects a fault trying to communicate to the DSP.
    ACM B1511:01 Automobile Audio Bus (A2B) Master Node: General Electrical Failure Sets continuous and during the self-test when the ACM detects a fault trying to communicate to the DSP.
    ACM B1511:11 Automobile Audio Bus (A2B) Master Node: Circuit Short To Ground Sets continuous and during the self-test when the ACM detects a short to ground from the Automobile Audio Bus (A2B).
    ACM B1511:12 Automobile Audio Bus (A2B) Master Node: Circuit Short To Battery Sets continuous and during the self-test when the ACM detects a short to voltage from the Automobile Audio Bus (A2B).
    ACM B1511:13 Automobile Audio Bus (A2B) Master Node: Circuit Open Sets continuous and during the self-test when the ACM detects an open from the Automobile Audio Bus (A2B) cable.
    ACM B1511:95 Automobile Audio Bus (A2B) Master Node: Incorrect Assembly Sets continuous and during the self-test when the ACM detects a fault trying to communicate to the DSP.
    DSP B13FB:11 Audio Enable Line: Circuit Short To Ground Sets continuous when the DSP does not detect the correct voltage signal from the enable circuit 5 seconds after receiving the ignition mode RUN message from the BCM.

    Possible Sources 

    • Network communication concern
    • Wiring, terminals, or connectors
    • Automobile Audio Bus (A2B) cable
    • Module configuration
    • DSP
    • ACM

  2. D1 VERIFY THE ACM (AUDIO FRONT CONTROL MODULE) PASSES THE NETWORK TEST

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the network test.

    Does the ACM pass the network test? 

    Yes  GO to  D2
    No  REFER to: Communications Network .

  3. D2 VERIFY THE APIM (SYNC MODULE) PASSES THE NETWORK TEST

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the network test.

    Does the APIM pass the network test? 

    Yes  If not  equipped with the Bang and Olufsen system, GO to  D4
    If equipped with the Bang and Olufsen system, GO to  D3
    No  REFER to: Communications Network .

  4. D3 VERIFY THE DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) PASSES THE NETWORK TEST

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the network test.

    Does the DSP pass the network test? 

    Yes  GO to  D4
    No  REFER to: Communications Network .

  5. D4 CHECK FOR APIM (SYNC MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, carry out the APIM self-test.

    Are any Diagnostic Trouble Codes (DTCs) present? 

    Yes  REFER to the APIM DTC Chart  in this information.
    No  GO to  D5

  6. D5 CHECK FOR ACM (AUDIO FRONT CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, carry out the ACM self-test.

    Are any Diagnostic Trouble Codes (DTCs) present? 

    Yes  For any Automobile Audio Bus (A2B) DTC, GO to  D13 For any speaker DTC, GO to Pinpoint Test G  For all other Diagnostic Trouble Codes (DTCs), REFER to ACM DTC Chart 
    No  If not equipped with the Bang and Olufsen system, GO to  D16 If equipped with the Bang and Olufsen system, GO to  D6

  7. D6 CHECK FOR DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, carry out the DSP self-test.

    Are any speaker Diagnostic Trouble Codes (DTCs) present? 

    Yes  GO to Pinpoint Test H 
    No  GO to  D7

  8. D7 CHECK THE DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) ENABLE CIRCUIT FOR CORRECT VOLTAGE

    • Ignition OFF.

    • Disconnect DSP C3154B.

    • Ignition ON.

    • Turn the audio system on.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C3154B-3
      GFD328349Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage between 3.5 and 7 volts? 

    Yes  GO to  D12
    No  GO to  D8

  9. D8 CHECK THE DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) ENABLE CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect ACM C240B.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C3154B-3
      GFD328349Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  D9

  10. D9 CHECK THE DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) ENABLE CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C3154B-3
      GFD328352Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  D10
    No  REPAIR the circuit.

  11. D10 CHECK THE DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) ENABLE CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C3154B-3
      GFD328352Courtesy of FORD MOTOR COMPANY
      		 Refer to C240B-23

    Is the resistance less than 3 ohms? 

    Yes  GO to  D11
    No  REPAIR the circuit.

  12. D11 CHECK THE ACM (AUDIO FRONT CONTROL MODULE) CONFIGURATION

    • Ignition OFF.

    • Connect DSP C3145B.

    • Connect ACM C240B.

    • Ignition ON.

    • Carry out the PMI programming for the ACM using as-built data.

    • Test the audio system for correct speaker operation.

    Is sound heard from all of the speakers? 

    Yes  The system is operating correctly. The cause may have been caused by incorrect module configuration.
    No  GO to  D13

  13. D12 CHECK FOR DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) CONFIGURATION

    • Ignition OFF.

    • Connect DSP C3145C.

    • Ignition ON.

    • Carry out the PMI programming for the DSP using as-built data.

    • Test the audio system for correct speaker operation.

    Is sound heard from all of the speakers? 

    Yes  The system is operating correctly. The cause may have been caused by incorrect module configuration.
    No  GO to  D13

  14. D13 CHECK THE FRONT AUTOMOBILE AUDIO BUS (A2B) CABLE

    • Ignition OFF.

    • Install a new front Automobile Audio Bus (A2B) cable.

    • Ignition ON.

    • Test the audio system for correct speaker operation.

    Is sound heard from all of the speakers? 

    Yes  The system is operating correctly. The cause was caused by the front Automobile Audio Bus (A2B) cable.
    No  GO to  D14

  15. D14 CHECK THE REAR AUTOMOBILE AUDIO BUS (A2B) CABLE

    • Ignition OFF.

    • Install a new rear Automobile Audio Bus (A2B) cable.

    • Ignition ON.

    • Test the audio system for correct speaker operation.

    Is sound heard from all of the speakers? 

    Yes  The system is operating correctly. The cause was caused by the rear Automobile Audio Bus (A2B) cable.
    No  GO to  D15

  16. D15 CHECK FOR CORRECT DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all the DSP connectors.

    • Repair:

      • Corrosion (clean module pins or install new connectors or terminals)
      • Damaged or bent pins (install new terminals or pins)
      • Pushed-out pins (install new pins as necessary)

    • Reconnect the DSP connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new DSP. REFER to: Audio Unit Amplifier . TEST the system for normal operation. If the concern is still present, GO to  D16
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

  17. D16 CHECK FOR CORRECT ACM (AUDIO FRONT CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all the ACM connectors.

    • Repair:

      • corrosion (install new connectors or terminals - clean module pins)
      • damaged or bent pins - install new terminals pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the ACM connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new ACM. REFER to: Audio Front Control Module (ACM) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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