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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> External Pages >> Different car >> Section 243 (Police Package Equipment) >> Diagnosis And Testing >> Lighting, Siren and Speaker System >> Pinpoint Tests >> The Siren Speaker Is Inoperative >> PINPOINT TEST F: The Siren Speaker Is Inoperative

PINPOINT TEST F: The Siren Speaker Is Inoperative

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  1. F1 CHECK THE SIREN SPEAKER FUNCTIONALITY 
    • Ignition ON.
    • Activate the siren.
    • Deactivate the siren and use the loudspeaker function.

    Are both the siren and loudspeaker functions inoperative? 

    1. Yes  : VERIFY the lighting and siren control module 20A siren fuse is OK. If OK, GO to  F3. If not OK, REFER to the appropriate OEM WIRING DIAGRAMS to identify the possible causes of the circuit short.
    2. No  : If the loudspeaker function is inoperative and the siren function operates normally, GO to F2  .

      If the siren function is inoperative and the loudspeaker function operates normally, CONTACT Whelen Service/Diagnostics at 1-860-526-9504, extension 8308.

  2. F2 CHECK THE MICROPHONE 
    • Test the loudspeaker function with a known good microphone.

    Does the loudspeaker system operate? 

    1. Yes  : INSTALL a new microphone.
    2. No  : GO to  F6.
  3. F3 CHECK THE MODULE OPERATION 
    • Activate the siren.
    • Listen to the lighting and siren control module.

    Does the lighting and siren control module make any audible siren sound? 

    1. Yes  : GO to F4  .
    2. No  : GO to  F6.
  4. F4 CHECK SIREN SPEAKER INPUT 
    • Ignition OFF.
    • Disconnect: Siren Speaker.
    • Ignition ON.
    • Activate the siren.
    • Measure:
      Positive Lead Measurement/Action Negative Lead
      C1471-1  FLUCTUATING AC VOLTAGE C1471-4 

    Is AC voltage present? 

    1. Yes  : INSTALL a new siren speaker. REFER to SIREN SPEAKER .
    2. No  : GO to F5  .
  5. F5 CHECK THE SIREN SPEAKER CIRCUITS FOR AN OPEN 
    • Ignition ON.
    • Disconnect: Lighting and Siren Control Module C4808B.
    • Measure:
      Positive Lead Measurement/Action Negative Lead
      C4808B-1  OHM C1471-1 
      C4808B-2  OHM C1471-4 

    Are the resistances less than 3 ohms? 

    1. Yes  : Verify the lighting and siren control module 20A siren fuse is OK.

      If OK, GO to F6  .

      If not OK, REFER to the appropriate OEM WIRING DIAGRAMS to identify the possible causes of the circuit short.

    2. No  : REPAIR the affected circuit.
  6. F6 CHECK FOR CORRECT LIGHTING CONTROL OPERATION 
    • Disconnect and inspect all the lighting and siren control module connectors and jumpers.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins as necessary
      • pushed-out-pins - install new pins as necessary
    • Reconnect the lighting and siren control module connectors and all previously disconnected exterior system connectors. Make sure they seat and latch correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    1. Yes  : CHECK OASIS  for any applicable TSBs  . If a TSB  exists for this concern, DISCONTINUE this test and FOLLOW TSB  instructions. If no TSBs  address this concern, CONTACT Whelen Service/Diagnostics at 1-860-526-9504, extension 8308.
    2. 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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