pizzadave

hey guys... just purchased an 07 Screw and wondering if anybody else has had any issues with just NO sound coming out of their speakers... and what they did as a remedy. It was this way with the factory head unit, and still remains with a new pioneer... speaker wire somewhere along the line must be disconnected or shorted am I right? My guess is to trace it out, or just pull my own new speaker wire to it! Any thoughts? Anybody have the same issue? THANKS

GATORB8

I think you've got it figured out. Running new wires will be a PITA if your truck was made at the Dearborn plant because of the molex connectors at the doors.

jayson_waltz

could also just be a blown speaker, they don't always crackle sometimes they just quit. Both rear speakers in my last car didn't work when i bought it, replaced the speakers and all was good.

pizzadave

I did put a different speaker on it... to see if it was blown... but NOTHING sooo I will just have to suck it up and pull some new wire I guess!

Cnorth8390

FMC Pinpoint Test...





PINPOINT TEST C: POOR QUALITY/DISTORTED/NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS)

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Test StepResult / Action to Take C1 CHECK FOR POOR SOUND/NO SOUND

• Ignition ON.
• Operate the audio unit in radio tuner mode.
• Carry out the speaker walk-around test.
• Are all the speakers inoperative?

Yes
GO to Symptom Chart.

No
If a rear speaker is inoperative and the vehicle is equipped with a DVD player, GO to C5 .


Otherwise, GO to C2 . C2 CHECK THE AUDIO SIGNAL TO THE SUSPECT SPEAKER

• Ignition OFF.
• Disconnect: Suspect Speaker.
• Ignition ON.
• Operate the audio unit in radio tuner mode.
• Measure the AC voltage between the suspect speaker pin 1 and pin 2, harness side as follows:
  
  Suspect SpeakerConnector-Pin/ CircuitConnector-Pin/ CircuitLH frontC523-1
  
  804 (OG/LG)C523-2
  
  813 (LB/WH)RH frontC612-1
  
  805 (WH/LG)C612-2
  
  811 (DG/OG)LH rearC702-1
  
  800 (GY/LB)C702-2
  
  801 (TN/YE)RH rearC802-1
  
  802 (OG/RD)C802-2
  
  803 (BN/PK)
• Is a fluctuating AC voltage present?

Yes
INSTALL a new speaker. REFER to Door Speaker in this section. TEST the system for normal operation.

No

GO to C3. C3 CHECK THE SPEAKER CIRCUITS FOR A SHORT TO VOLTAGE

• Ignition OFF.
• Disconnect: Audio Unit C290a.
• Ignition ON.
• Measure the voltage between the audio unit, harness side and ground as follows:
  
  Suspect SpeakerAudio Unit Connector-Pin/ CircuitAudio Unit Connector-Pin/ CircuitLH frontC290a-8
  
  804 (OG/LG)C290a-21
  
  813 (LB/WH)RH frontC290a-11
  
  805 (WH/LG)C290a-12
  
  811 (DG/OG)LH rearC290a-9
  
  800 (GY/LB)C290a-22
  
  801 (TN/YE)RH rearC290a-10
  
  802 (OG/RD)C290a-23
  
  803 (BN/PK)
• Is any voltage present?

Yes
REPAIR the circuit in question. TEST the system for normal operation.

No

GO to C4. C4 CHECK THE SPEAKER CIRCUITS FOR AN OPEN OR SHORT TO GROUND

• Ignition OFF.
• Measure the resistance between the audio unit, harness side and the suspect speaker, harness side; and between the audio unit, harness side and ground as follows:
  
  Suspect SpeakerAudio Unit Connector- PinSpeaker Connector- PinCircuitLH frontC290a-8C523-1804 (OG/LG) C290a-21C523-2813 (LB/WH)RH frontC290a-11C612-1805 (WH/LG) C290a-12C612-2811 (DG/OG)LH rearC290a-9C702-1800 (GY/LB) C290a-22C702-2801 (TN/YE)RH rearC290a-10C802-1802 (OG/RD) C290a-23C802-2803 (BN/PK)
• Are the resistances less than 5 ohms between the audio unit and the suspect speaker, and greater than 10,000 ohms between the audio unit and ground?

Yes
SEND the audio unit to an authorized audio system repair facility. TEST the system for normal operation after the repair.

No

REPAIR the circuit in question. TEST the system for normal operation. C5 BYPASS THE DVD PLAYER

• Ignition OFF.
• Disconnect: DVD Player C949.
• Connect fused (10A) jumper wires at the DVD player, harness side as follows:
  
  Connector-Pin/CircuitConnector-Pin/CircuitC949-7
  
  802 (OG/RD)C949-20
  
  1789 (VT/WH)C949-8
  
  803 (BN/PK)C949-21
  
  1788 (YE/RD)C949-9
  
  800 (GY/LB)C949-18
  
  1734 (LG/BK)C949-10
  
  801 (TN/YE)C949-19
  
  1733 (WH)
  
  
  
• Ignition ON.
• Operate the audio unit in radio tuner mode.
• Does the speaker operate correctly?

Yes
REMOVE the DVD player and SEND it to an authorized audio system repair facility. REFER to Digital Versatile Disc (DVD) Player in this section. TEST the system for normal operation after the repair.

No

REMOVE the jumper wires. GO to C6 . C6 CHECK THE SPEAKER CIRCUITS FROM THE DVD PLAYER TO THE REAR SPEAKERS

• Ignition OFF.
• Measure the resistance between the DVD player connector pins, harness side as follows:
  
  Suspect SpeakerDVD Player Connector-Pin/ CircuitDVD Player Connector-Pin/ CircuitLH rearC949-18
  
  1734 (LG/BK)C949-19
  
  1733 (WH)RH rearC949-20
  
  1789 (VT/WH)C949-21
  
  1788 (YE/RD)
• Are the resistances approximately 5 ohms?

Yes
GO to C9.

No

GO to C7. C7 CHECK THE CIRCUITS TO THE REAR SPEAKERS FOR A SHORT TO VOLTAGE

• Disconnect: Suspect Speaker.
• Ignition ON.
• Measure the voltage between the DVD player, harness side and ground as follows:
  
  Suspect SpeakerDVD Player Connector-Pin/ CircuitDVD Player Connector-Pin/ CircuitLH rearC949-19
  
  1733 (WH)C949-18
  
  1734 (LG/BK)RH rearC949-21
  
  1788 (YE/RD)C949-20
  
  1789 (VT/WH)
• Is any voltage present?

Yes
REPAIR the circuit in question. TEST the system for normal operation.

No

GO to C8. C8 CHECK THE CIRCUITS TO THE REAR SPEAKERS FOR AN OPEN OR SHORT TO GROUND

• Ignition OFF.
• Measure the resistance between the DVD player, harness side and the suspect speaker, harness side; and between the DVD player, harness side and ground as follows:
  
  Suspect SpeakerDVD Player Connector- PinSpeaker Connector- PinCircuitLH rearC949-19C702-21733 (WH) C949-18C702-11734 (LG/BK)RH rearC949-21C802-21788 (YE/RD) C949-20C802-11789 (VT/WH)
• Is the resistance less than 5 ohms between the DVD player and the audio unit, and greater than 10,000 ohms between the DVD player and ground?

Yes
INSTALL a new speaker. REFER to Door Speaker in this section. TEST the system for normal operation.

No

REPAIR the circuit in question. TEST the system for normal operation. C9 CHECK THE SPEAKER OUTPUT CIRCUITS FROM THE AUDIO UNIT TO THE DVD PLAYER FOR AC VOLTAGE

• Ignition ON.
• Operate the audio unit in radio tuner mode.
• Measure the AC voltage between the DVD player pins, harness side as follows.
  
  Suspect SpeakerDVD Player Connector-Pin/ CircuitDVD Player Connector-Pin/ CircuitLH rearC949-9
  
  800 (GY/LB)C949-10
  
  801 (TN/YE)RH rearC949-7
  
  802 (OG/RD)C949-8
  
  803 (BN/PK)
• Is a fluctuating AC voltage present?

Yes
REMOVE the DVD player and send it to an authorized audio system repair facility. REFER to Digital Versatile Disc (DVD) Player in this section. TEST the system for normal operation after the repair.

No

GO to C10. C10 CHECK THE AUDIO CIRCUITS TO THE DVD PLAYER FOR A SHORT TO VOLTAGE

• Ignition OFF.
• Disconnect: Audio Unit C290a.
• Ignition ON.
• Measure the voltage between the audio unit, harness side and ground as follows:
  
  Suspect SpeakerAudio Unit Connector- PinCircuitLH rearC290a-9800 (GY/LB) C290a-22801 (TN/YE)RH rearC290a-10802 (OG/RD) C290a-23803 (BN/PK)
• Is any voltage present?

Yes
REPAIR the circuit in question. TEST the system for normal operation.

No

GO to C11. C11 CHECK THE AUDIO CIRCUITS TO THE DVD PLAYER FOR AN OPEN OR SHORT TO GROUND

• Ignition OFF.
• Measure the resistance between the audio unit, harness side and the DVD player, harness side; and between the audio unit, harness side and ground as follows:
  
  Suspect SpeakerAudio Unit Connector- PinDVD Player Connector- PinCircuitLH rearC290a-9C949-9800 (GY/LB)LH rearC290a-22C949-10801 (TN/YE)RH rearC290a-10C949-7802 (OG/RD)RH rearC290a-23C949-8803 (BN/PK)
• Are the resistances less than 5 ohms between the audio unit and the DVD player, and greater than 10,000 ohms between the audio unit and ground?

Yes
SEND the audio unit to an authorized audio system repair facility. TEST the system for normal operation after the repair.

No
REPAIR the circuit in question. TEST the system for

Kevan909

Not a mechanic. I live in florida and my 08 f150 has rubber on the floor and not carpet. I go to the beach and get sand all over the floor. When I get home I take a light pray of the hose and flush all sand out of the truck. 2 years later my audio stopped working on my radio. Radio had power but sound would come and go. Took off panel that sits under door on the floor and that channel had wires running through there and channel was full of water. Took vac and removed all water and radio is fine. So now I vac instead of flushing with hose.