Home ReviewsRefund
Home/Ford/Five Hundred/Ford Five Hundred I (2004-2007)/Repair manual/Entertainment Systems/Entertainment System - General Information
Contents Section: Entertainment Systems All sections

Entertainment System - General Information Ford Five Hundred I

Entertainment Systems 34 illustrations ~5348 words

Audio System

Refer to RADIO (Montego), RADIO (Five Hundred), or RADIO (Freestyle) for schematic and connector information.

Special Tool(s)

SPECIAL TOOL(S) CHART 73III Automotive Meter 105-R0057 or equivalent Worldwide Diagnostic System (WDS) Vehicle Communication Module (VCM) with appropriate adaptors, or equivalent diagnostic tool

Scheme 5

Scheme 5: Special Tool(s)
Scheme 5: Special Tool(s)

Scheme 6

Scheme 6
Scheme 6

Principles of Operation

The audio control unit can be powered up when the ignition is in the ON or ACC position. The audio control unit provides audio signals to the speakers, thus producing sound.

The audio control unit directs the audio signals to the speakers through separate positive and negative circuits for each of the 4 audio channels: LH front, RH front, LH rear, and RH rear. The audio control unit provides internal circuit protection for shorts to ground, shorts to B+ battery or shorts between any output circuits.

The subwoofer speaker is powered from a separate subwoofer amplifier. The enable/clip circuit carries out 2 functions: to turn on the subwoofer amplifier, and to indicate to the audio control unit when the subwoofer output distortion signal reaches a damaging level. The audio control unit then reduces the audio output signal to the subwoofer amplifier.

The DVD player receives a wake up signal from the audio control unit through the controller area network (CAN). When a video disc is inserted into the DVD player and the PLAY button is pressed, an image is displayed on the screen and a stereo signal is transmitted to the audio control unit.

The radio suppression equipment reduces interference transmitted through the speakers by the engine ignition and electrical systems.

The steering wheel audio control consists of a specific resistor value for each button function creating a voltage divider. When a button is pressed, a specific reference voltage is sent to the audio control unit. The audio control unit then uses this reference voltage to determine which control input function has been selected

Inspection and Verification

  1. Verify the customer concern.
  2. Visually inspect for obvious signs of mechanical or electrical damage. VISUAL INSPECTION CHART Mechanical Electrical Audio control unit Antenna or antenna cable(s) Speakers, mounting/speaker cones Radio ignition interference capacitors, radio frequency interference suppression bond, and radio receiver hood bonding strap Digital versatile disc (DVD) player Smart junction box (SJB) fuse(s): 5 (20A) 6 (20A) 11 (20 A) 13 (7.5A) 15 (10A) Battery junction box (BJB) fuse(s): 1 (80A) 29 (80A) Ignition switch Circuitry
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  4. If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle: check that the program card is correctly installed. check the connections to the vehicle. check the ignition switch position.
  5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
  6. Carry out the diagnostic tool data link test. If the diagnostic tool responds with: CAN circuit fault; all electronic control units no response/not equipped, refer to «MODULE COMMUNICATIONS NETWORK»(/ford/five-hundred/i-2004-2007/remont/communication-devices/#module-communications-network-system) . No response/not equipped for the audio control module, GO to «PINPOINT TEST A»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) . No response/not equipped for the DVD player, GO to «PINPOINT TEST B»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) . System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out self-test diagnostics for the audio control module.
  7. If the DTCs retrieved are related to the concern, go to the «AUDIO CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information__audio-control-module-diagnostic-trouble-code) or the «DIGITAL VERSATILE DISC (DVD) PLAYER DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information__digital-versatile-disc-dvd-player-diagnostic) .
  8. If no DTCs related to the concern are retrieved, GO to «SYMPTOM CHART»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information__symptom-chart) .

Audio Control Module Diagnostic Trouble Code (DTC) Index

DTCDescriptionSourceAction
B1317Battery Voltage HighAudio Control ModuleCLEAR the DTCs. REPEAT the audio control module self-test. If DTC B1317 is retrieved again, REFER to CHARGING SYSTEM - GENERAL INFORMATION to diagnose the charging system. CLEAR the DTCs. REPEAT the self-test.
B1318Battery Voltage LowAudio Control ModuleCLEAR the DTCs. REPEAT the audio control module self-test. If DTC B1318 is retrieved again, REFER to CHARGING SYSTEM - GENERAL INFORMATION to diagnose the charging system. CLEAR the DTCs. REPEAT the self-test.
B1342ECU is FaultedAudio Control ModuleCLEAR the DTCs. REPEAT the audio control module self-test. If DTC B1342 is retrieved again, REMOVE the audio control unit. REFER to AUDIO UNIT . SEND it to an authorized repair facility. CLEAR the DTCs. REPEAT the self-test after the repair.
B2405Audio Disc CD Player Thermal Shutdown FaultAudio Control ModuleAllow unit to cool - Disregard.
B2406Audio Disc CD Player Internal FaultAudio Control ModuleCLEAR the DTCs. REPEAT the audio control module self-test. If DTC B2406 is retrieved again, REMOVE the audio control unit. REFER to AUDIO UNIT . SEND it to an authorized repair facility. CLEAR the DTCs. REPEAT the self-test after the repair.
B2477Module Configuration FailureAudio Control ModuleREFER to MODULE CONFIGURATION to continue diagnosis of the module configuration.
B2924Audio Button StuckAudio Control ModuleCLEAR the DTCs. REPEAT the audio control module self-test. If DTC B2924 is retrieved again, REMOVE the audio control unit. REFER to AUDIO UNIT . SEND it to an authorized repair facility. CLEAR the DTCs. REPEAT the self-test after the repair.
B2965Audio System Speaker Circuit FaultAudio Control ModuleGO to PINPOINT TEST E .
U0073Control Module Communication BUS OffAudio Control ModuleREFER to MODULE COMMUNICATIONS NETWORK to continue diagnosis of the communication network.
U1900CAN Communication BUS Fault - Receiver ErrorAudio Control ModuleREFER to MODULE COMMUNICATIONS NETWORK to continue diagnosis of the communication network.

DTC DETECTION CONDITION CHART

Digital Versatile Disc (DVD) Player Diagnostic Trouble Code (DTC) Index

DTCDescriptionSourceAction
B1317Battery Voltage HighDVD PlayerCLEAR the DTCs. REPEAT the audio control module self-test. If DTC B1317 is retrieved again, REFER to CHARGING SYSTEM - GENERAL INFORMATION to diagnose the charging system. CLEAR the DTCs. REPEAT the self-test.
B1318Battery Voltage LowDVD PlayerCLEAR the DTCs. REPEAT the audio control module self-test. If DTC B1318 is retrieved again, REFER to CHARGING SYSTEM - GENERAL INFORMATION to diagnose the charging system. CLEAR the DTCs. REPEAT the self-test.
B1342ECU is FaultedDVD PlayerCLEAR the DTCs. REPEAT the DVD player self-test. If DTC B1342 is retrieved again, REMOVE the DVD player. REFER to VIDEO SYSTEM . SEND it to an authorized repair facility. REPEAT the self-test after the repair.
B2656Digital Versatile Disc (DVD) ErrorDVD PlayerCLEAR the DTCs. INSERT a known good DVD. REPEAT the DVD player self-test. If DTC B2656 is retrieved again, REMOVE the DVD player. REFER to VIDEO SYSTEM . SEND it to an authorized repair facility. REPEAT the self-test after the repair.
U0073Control Module Communication BUS OffDVD PlayerREFER to MODULE COMMUNICATIONS NETWORK to continue diagnosis of the communication network.
U1900CAN Communication BUS Fault - Receiver ErrorDVD PlayerREFER to MODULE COMMUNICATIONS NETWORK to continue diagnosis of the communication network.

DTC DETECTION CONDITION CHART

Symptom Chart

ConditionPossible SourcesAction
The audio control unit does not illuminateCircuitry Audio control unitREFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION .
No communication with the audio control moduleCircuitry Audio control unitGO to PINPOINT TEST A .
No communication with the digital versatile disc (DVD) playerCircuitry DVD playerGO to PINPOINT TEST B .
The audio control unit is inoperative/does not operate correctlyCircuitry Audio control unitGO to PINPOINT TEST C .
Poor receptionAntenna Antenna connections Noise suppression equipment Audio control unitGO to PINPOINT TEST D .
Continuous SEEK/SCAN in AM/FMAntenna Antenna connections Noise suppression equipment Audio control unitGO to PINPOINT TEST D .
Poor quality/distorted sound from one or more speakers (not all speakers)Speaker(s) Circuitry Audio control unitGO to PINPOINT TEST E .
Poor quality/distorted sound from all speakersAntenna Antenna connectionsIf the audio control unit illuminates, GO to PINPOINT TEST F .
Audio control unitIf the audio control unit does not illuminate, REMOVE the audio control unit. REFER to AUDIO UNIT . SEND it to an authorized repair facility. TEST the system for normal operation after the repair.
No sound from one or more of the speakers (not all speakers)Speaker(s) Circuitry Audio control unitGO to PINPOINT TEST E .
No sound from all speakersCircuitry Reverse parking aidIf the audio control unit illuminates, GO to PINPOINT TEST F .
Audio control unitIf the audio control unit does not illuminate, REMOVE the audio control unit. REFER to AUDIO UNIT . SEND it to an authorized repair facility. TEST the system for normal operation after the repair.
The auxiliary audio control is inoperative/does not operate correctly - steering wheel control switchesCircuitry Audio control unit Steering wheel control switches ClockspringGO to PINPOINT TEST G .
The subwoofer is inoperativeCircuitry Audio control unit Subwoofer amplifierGO to PINPOINT TEST H .
The digital versatile disc (DVD) player is inoperative/does not operate correctly - no pictureDiscPRESS the source button (screen is blank in auxiliary module with no video source connected). TEST the system for normal operation.
DVD playerIf the concern is still present, REMOVE the DVD player. REFER to VIDEO SYSTEM . SEND it to an authorized repair facility. TEST the system for normal operation after the repair.
The digital versatile disc (DVD) player is inoperative/does not operate correctlyCircuitry Video systemGO to PINPOINT TEST I .
The digital versatile disc (DVD) player is inoperative/does not operate correctly - remote control does not function correctlyVideo systemINSTALL new batteries in the remote control. If the concern is still present, CONTACT an authorized audio repair facility for further diagnostic test procedures.

SYMPTOM CHART

Scheme 7

Scheme 7: Connector Circuit Reference
Scheme 7: Connector Circuit Reference

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11

Scheme 12

Scheme 12
Scheme 12

Scheme 13

Scheme 13
Scheme 13

Normal Operation

Voltage is supplied to the audio control module on circuit 1111 (VT). The audio control module is grounded through circuit 1204 (BK/OG).

Possible Causes

  1. circuit 1111 (VT) open
  2. circuit 1204 (BK/OG) open
  3. audio control module

Scheme 14

Scheme 14: Testing
Scheme 14: Testing

Scheme 15

Scheme 15
Scheme 15
  1. A1 CHECK CIRCUIT 1111 (VT) FOR VOLTAGE Disconnect: Audio Control Module C240a. Key in ON position. Measure the voltage between the audio control module C240a-1, circuit 1111 (VT), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to A2. No : REPAIR the circuit. TEST the system for normal operation.
  2. A2 CHECK CIRCUIT 1204 (BK/OG) FOR AN OPEN Key in OFF position. Measure the resistance between the audio control module C240a-13, circuit 1204 (BK/OG), harness side and ground. Is the resistance less than 5 ohms? Yes : REFER to «MODULE COMMUNICATIONS NETWORK»(/ford/five-hundred/i-2004-2007/remont/communication-devices/#module-communications-network-system) to continue network communication diagnosis. No : REPAIR the circuit. TEST the system for normal operation.

Voltage is supplied to the DVD player on circuit 1563 (LG). The DVD player is grounded through circuit 1204 (BK/OG).

  1. circuit 1204 (BK/OG) open
  2. circuit 1563 (LG) open
  3. DVD player

Scheme 16

Scheme 16: Testing
Scheme 16: Testing

Scheme 17

Scheme 17
Scheme 17
  1. B1 CHECK CIRCUIT 1563 (LG) FOR VOLTAGE Disconnect: DVD player C9029. Key in ON position. Measure the voltage between the DVD player C9029-1, circuit 1563 (LG), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to B2. No : REPAIR the circuit. TEST the system for normal operation.
  2. B2 CHECK CIRCUIT 1204 (BK/OG) FOR AN OPEN Key in OFF position. Measure the resistance between the DVD player C9029-14, circuit 1204 (BK/OG), harness side and ground. Is the resistance less than 5 ohms? Yes : REFER to «MODULE COMMUNICATIONS NETWORK»(/ford/five-hundred/i-2004-2007/remont/communication-devices/#module-communications-network-system) to continue network communication diagnosis. No : REPAIR the circuit. TEST the system for normal operation.

The audio control unit can be powered up when the ignition is in the ON or ACC position. The audio control unit provides audio signals to the speakers, thus producing sound.

  1. circuit 1006 (BK/PK) open or short to ground
  2. circuit 1111 (VT) open or short to ground
  3. circuit 1204 (BK/OG) open
  4. circuit 1772 (VT) short to voltage
  5. audio control unit

Scheme 18

Scheme 18: Testing
Scheme 18: Testing

Scheme 19

Scheme 19
Scheme 19
  1. C1 CHECK OPERATION OF THE AUDIO CONTROL UNIT Key in ON position. Turn on the audio control unit. Is the audio control unit display illuminated? Yes : GO to C2. No : GO to C4 .
  2. C2 CHECK FOR SOUND COMING FROM THE SPEAKERS Operate the audio control unit. Adjust the speaker controls front to rear, and left to right. Check for sound from the speakers. Is sound coming from the speakers? Yes : GO to C3. No : GO to «SYMPTOM CHART»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information__symptom-chart) to continue diagnosis.
  3. C3 CARRY OUT THE CONTROLS AND FEATURES TEST Verify that all the audio system controls and features operate correctly. Refer to the Owner's Literature to verify correct operation. Do all the controls and features operate correctly? Yes : INFORM the customer how to correctly operate the audio system controls and features. No : REMOVE the audio control unit. REFER to «AUDIO UNIT»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#audio-unit-system) . SEND it to an authorized repair facility. TEST the system for normal operation after the repair.
  4. C4 CHECK CIRCUIT 1006 (BK/PK) FOR VOLTAGE Key in OFF position. Disconnect: Audio Control Unit C240a. Key in ACCESSORY position. Measure the voltage between the audio control unit C240a-2, circuit 1006 (BK/PK), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to C5. No : REPAIR the circuit. TEST the system for normal operation.
  5. C5 CHECK CIRCUIT 1111 (VT) FOR VOLTAGE Key in ON position. Measure the voltage between the audio control unit C240a-1, circuit 1111 (VT), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to C6. No : REPAIR the circuit. TEST the system for normal operation.
  6. C6 CHECK CIRCUIT 1204 (BK/OG) FOR AN OPEN Key in OFF position. Measure the resistance between the audio control unit C240a-13, circuit 1204 (BK/OG), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to C7. No : REPAIR the circuit. TEST the system for normal operation.
  7. C7 CHECK CIRCUIT 1772 (VT) FOR A SHORT TO VOLTAGE While cycling the ignition switch from OFF, through ACC, to ON, measure the voltage between the audio control unit C240a-15, circuit 1772 (VT), harness side and ground. Is any voltage present? Yes : REPAIR the circuit. TEST the system for normal operation. No : GO to C8.
  8. C8 CHECK FOR CORRECT AUDIO CONTROL UNIT OPERATION Disconnect the audio control unit connectors. Check for: corrosion pushed-out pins Connect the audio control unit connectors and make sure they seat correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes : REMOVE the audio control unit. REFER to «AUDIO UNIT»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#audio-unit-system) . SEND it to an authorized repair facility. TEST the system for normal operation after the repair. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

The radio suppression equipment reduces interference transmitted through the speakers by the engine ignition and electrical systems.

  1. antenna
  2. antenna connections
  3. noise suppression equipment
  4. antenna module
  5. antenna grid
  6. audio control unit

Testing

  1. D1 CHECK THE RADIO SIGNAL RECEPTION Check the audio control unit signal reception with the engine running and with the engine off. Is the audio control unit signal reception noisy only with the engine running? Yes : GO to D2. No : GO to D8 .
  2. D2 CHECK THE SUPPRESSION EQUIPMENT Check all required suppression equipment, the radio frequency interference suppression bond, and the hood bonding strap for security, cleanliness, and metal-to-metal contact. Are the contacts clean, secure, and in metal-to-metal contact? Yes : GO to D3. No : INSTALL new radio frequency interference suppression bonds or related equipment. CLEAN or SECURE the connections as necessary. CLEAR the DTCs. REPEAT the self-test.
  3. D3 CHECK THE CAPACITOR MOUNTING AND CONNECTING CIRCUITS NOTE: The capacitor mounting points are used to complete the electrical circuit and must be mounted securely to clean surfaces. Check the mounting and connecting circuits of the radio ignition interference capacitor(s) for security, cleanliness, and metal-to-metal contact. Are the contacts clean, secure, and in metal-to-metal contact? Yes : GO to D4. No : CLEAN or SECURE the connections as necessary. CLEAR the DTCs. REPEAT the self-test.
  4. D4 CHECK THE RADIO IGNITION INTERFERENCE CAPACITOR(S) AND THE GENERATOR Check the operation of the radio ignition interference capacitor(s) by installing known good component(s). Check the generator by disconnecting the wiring harness from the voltage regulator. Start the engine and allow it to idle. Check the operation of the audio control unit. Is the noise eliminated? Yes : REPAIR or INSTALL new components as necessary. CLEAR the DTCs. REPEAT the self-test. No : GO to D5.
  5. D5 CHECK THE IGNITION CIRCUITS Key in OFF position. Check the ignition circuits for correct routing, grounding, and security of connections. Are the circuits OK? Yes : GO to D6. No : REPAIR the circuit as necessary. CLEAR the DTCs. REPEAT the self-test.
  6. D6 CHECK THE IGNITION SYSTEM Test the ignition system. Refer to «INTRODUCTION - GASOLINE»(/ford/five-hundred/i-2004-2007/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article . Is the ignition system OK? Yes : GO to D7. No : REFER to «INTRODUCTION - GASOLINE»(/ford/five-hundred/i-2004-2007/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article to continue diagnosis of the ignition system. CLEAR the DTCs. REPEAT the self-test.
  7. D7 SUBSTITUTE THE AUDIO CONTROL UNIT Key in OFF position. Substitute a known good audio control unit. Start the engine and allow it to idle. Check the operation of the audio control unit. Is the noise eliminated? Yes : REMOVE the audio control unit. REFER to «AUDIO UNIT»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#audio-unit-system) . SEND it to an authorized repair facility. CLEAR the DTCs. REPEAT the self-test after the repair. No : REINSTALL the original audio control unit. USE a jumper cable to ground various parts of the vehicle to the frame (for example: engine, fenders, quarter panels, stone deflectors, air cleaner, body sheet metal). When the noise is eliminated, PROVIDE a permanent ground where necessary. CLEAR the DTCs. REPEAT the self-test.
  8. D8 CHECK THE ANTENNA FOR DAMAGE Key in OFF position. Disconnect: Antenna Lead Terminal. Measure the resistance between the antenna cable lead terminal and the end of the antenna. Is the resistance less than 8 ohms? Yes : GO to D9. No : INSTALL a new antenna. REFER to «ANTENNA»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#antenna-system) .
  9. D9 SUBSTITUTE AUDIO CONTROL UNIT Substitute a known good audio control unit. Start the engine and allow it to idle. Check the operation of the audio control unit. Is the noise eliminated? Yes : REMOVE the audio control unit. REFER to «AUDIO UNIT»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#audio-unit-system) . SEND it to an authorized repair facility. CLEAR the DTCs. REPEAT the self-test after the repair. No : INSTALL a new antenna cable. REFER to «ANTENNA»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#antenna-system) .

The audio control unit directs the audio signals to the speakers through separate positive and negative circuits for each of the 4 audio channels: LH front, RH front, LH rear, and RH rear. The audio control unit provides internal circuit protection for shorts to ground, shorts to B+ battery or shorts between any output circuits.

  1. speakers
  2. audio control unit
  3. high resistance or a short to ground in the speaker circuits

Scheme 20

Scheme 20: Testing
Scheme 20: Testing

Scheme 21

Scheme 21
Scheme 21

Scheme 22

Scheme 22
Scheme 22
  1. E1 CHECK FOR SOUND Key in ON position. Turn on the audio control unit. Adjust the speaker controls front to rear, and left to right. Do all speakers have poor quality/distorted sound or no sound? Yes : GO to «PINPOINT TEST F»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) . No : GO to E2.
  2. E2 CHECK FOR AN AUDIO SIGNAL OUTPUT TO THE SPEAKER WITH POOR QUALITY/DISTORTED SOUND OR NO SOUND Key in OFF position. Disconnect: Speaker(s) with poor quality/distorted sound or no sound. Key in ON position. Turn on the audio control unit. Measure the voltage between pin 1 and pin 2 of the speaker with poor quality/distorted sound or no sound. Refer to the following table «AUDIO SIGNAL OUTPUT CHART»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) for correct location, connector, pin and circuit information. AUDIO SIGNAL OUTPUT CHART Speaker Output Return LH front C523-1, circuit 804 (OG/LG) C523-2, circuit 813 (LB/WH) RH front C612-1, circuit 805 (WH/LG) C612-2, circuit 811 (DG/OG) LH rear C702-1, circuit 800 (GY/LB) C702-2, circuit 801 (TN/YE) RH rear C802-1, circuit 802 (OG/RD) C802-2, circuit 803 (BN/PK) Is there a fluctuating AC voltage? Yes : INSTALL a new speaker. REFER to «SPEAKERS»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#speaker-system) . CLEAR the DTCs. REPEAT the self-test. No : GO to E3.
  3. E3 CHECK THE CIRCUITS BETWEEN THE SPEAKER(S) AND THE AUDIO CONTROL UNIT FOR OPENS Key in OFF position. Disconnect: Audio Control Unit C240a. Measure the resistance between the speaker with poor quality/distorted sound and the audio control unit. Refer to the following table «AUDIO SIGNAL OUTPUT INSPECTION»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) for correct location, connector, pin and circuit information. AUDIO SIGNAL OUTPUT INSPECTION Location/Function Speaker Connector-Pin Audio Control Unit Connector-Pin Circuit LH front output 523-1 240a-8 804 (OG/LG) LH front return 523-2 240a-21 813 (LB/WH) RH front output 612-1 240a-11 805 (WH/LG) RH front return 612-2 240a-12 811 (DG/OG) LH rear output 702-1 240a-9 800 (GY/LB) LH rear return 702-2 240a-22 801 (TN/YE) RH rear output 802-1 240a-10 802 (OG/RD) RH rear return 802-2 240a-23 803 (BN/PK) Are the resistance(s) less than 5 ohms? Yes : GO to E4. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  4. E4 CHECK THE CIRCUITS BETWEEN THE SPEAKER(S) AND THE AUDIO CONTROL UNIT FOR A SHORT TO GROUND Measure the resistance between the speaker with poor quality/distorted sound and ground. Refer to the following table «AUDIO SIGNAL OUTPUT INSPECTION»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) for correct location, connector, pin and circuit information. AUDIO SIGNAL OUTPUT INSPECTION Speaker Output Return LH front C523-1, circuit 804 (OG/LG) C523-2, circuit 813 (LB/WH) RH front C612-1, circuit 805 (WH/LG) C612-2, circuit 811 (DG/OG) LH rear C702-1, circuit 800 (GY/LB) C702-2, circuit 801 (TN/YE) RH rear C802-1, circuit 802 (OG/RD) C802-2, circuit 803 (BN/PK) Are the resistances greater than 10,000 ohms? Yes : GO to E5. No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  5. E5 CHECK FOR CORRECT AUDIO CONTROL UNIT OPERATION Disconnect the audio control unit connectors. Check for: corrosion pushed-out pins Connect the audio control unit connectors and make sure they seat correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes : REMOVE the audio control unit. REFER to «AUDIO UNIT»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#audio-unit-system) . SEND it to an authorized repair facility. CLEAR the DTCs. REPEAT the self-test after the repair. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

The audio control unit directs the audio signals to the speakers through separate positive and negative circuits for each of the 4 audio channels: LH front, RH front, LH rear, and RH rear. The audio control unit provides a signal to the reverse parking aid module. When this signal is activated, the audio control unit mutes all speakers allowing the operator to hear the audible reverse indicator.

  1. speakers
  2. audio control unit
  3. high resistance or a short to ground in the speaker circuits

Scheme 23

Scheme 23: Testing
Scheme 23: Testing

Scheme 24

Scheme 24
Scheme 24
  1. F1 CHECK THE OPERATION OF THE AUDIO CONTROL UNIT Key in ON position. Turn on the audio control unit. Is the audio control unit display illuminated? Yes : GO to F2. No : GO to «PINPOINT TEST C»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) .
  2. F2 CHECK FOR SOUND Adjust the speaker controls front to rear, and left to right. Do all speakers have poor quality/distorted sound or no sound? Yes : For poor quality/distorted sound, GO to «PINPOINT TEST D»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) . For no sound, GO to F3. No : GO to «PINPOINT TEST E»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) .
  3. F3 CHECK CIRCUIT 689 (DB) FOR A SHORT TO GROUND Key in OFF position. Disconnect: Audio Control Unit C240a. Measure the resistance between the audio control unit, C240a-20, circuit 689 (DB), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : GO to F5 . No : GO to F4.
  4. F4 CHECK THE REVERSE PARKING AID MODULE Disconnect: Reverse Parking Aid Module C4014. Measure the resistance between the audio control unit, C240a-20, circuit 689 (DB), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : REFER to «PARKING AID»(/ford/five-hundred/i-2004-2007/remont/warning-system/#parking-aid-system) for continued diagnosis of the reverse parking aid system. No : REPAIR the circuit. TEST the system for normal operation.
  5. F5 CHECK CIRCUIT 595 (LB/RD) FOR THE CORRECT RESISTANCE Measure the resistance between the audio control unit, C240a-18, circuit 595 (LB/RD), harness side and ground. Is the resistance between 5,280 - 5,390 ohms? Yes : GO to F6. No : GO to «PINPOINT TEST G»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) .
  6. F6 CHECK FOR CORRECT AUDIO CONTROL UNIT OPERATION Disconnect the audio control unit connectors. Check for: corrosion pushed-out pins Connect the audio control unit connectors and make sure they seat correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes : REMOVE the audio control unit. REFER to «AUDIO UNIT»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#audio-unit-system) . SEND it to an authorized repair facility. TEST the system for normal operation after the repair. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

The steering wheel audio control consists of a specific resistor value for each button function creating a voltage divider. When a button is pressed, a specific reference voltage is sent to the audio control unit. The audio control unit then uses this reference voltage to determine which control input function has been selected. Circuit 595 (LB/RD) is the reference voltage circuit between the steering wheel audio controls and the audio control unit.

  1. steering wheel audio controls
  2. audio control unit
  3. clockspring
  4. circuit 595 (LB/RD) open or short to ground
  5. circuit 1203 (BK/LB) open

Scheme 25

Scheme 25
Scheme 25

Scheme 26

Scheme 26
Scheme 26
  1. G1 CHECK THE STEERING WHEEL CONTROL SWITCH RESISTANCES Key in OFF position. Disconnect: Audio Control Unit C240a. While pressing the steering wheel control switches, measure the resistance between the audio control unit C240a-18, circuit 595 (LB/RD), harness side and ground. Refer to the following table «WHEEL CONTROL SWITCH RESISTANCES»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) for correct switch and resistance range. WHEEL CONTROL SWITCH RESISTANCES Switch Resistance Range VOL Down 53.0-54.1 ohms VOL Up 145.2-148.1 ohms SEEK Up 297.6-303.7 ohms SEEK Down 912.4-930.9 ohms MEDIA 1,382.7-1,410.6 ohms Mute 2,372.7-2,420.6 ohms None 5,639.7-5,753.6 ohms Are the resistances within specification? Yes : GO to G5 . No : GO to G2.
  2. G2 CHECK THE AUXILIARY AUDIO CONTROL GROUND CIRCUIT FOR AN OPEN Disconnect: Auxiliary Audio Control Switch Assembly. Measure the resistance between the auxiliary audio control switch assembly-4, circuit 1203 (BK/LB), harness side ground. Is the resistance less than 5 ohms? Yes : GO to G3. No : REPAIR the circuit. TEST the system for normal operation.
  3. G3 CHECK THE AUXILIARY AUDIO CONTROL SIGNAL CIRCUIT FOR AN OPEN Measure the resistance between the auxiliary audio control switch assembly-5, circuit 595 (LB/RD), harness side and the audio control unit C240a-18, circuit 595 (LB/RD), harness side. Is the resistance less than 5 ohms? Yes : GO to G4. No : REPAIR the circuit. TEST the system for normal operation.
  4. G4 CHECK CIRCUIT 595 (LB/RD) FOR A SHORT TO GROUND Measure the resistance between the audio control unit C240a-18, circuit 595 (LB/RD), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : INSTALL a new auxiliary audio control steering wheel switch assembly. REFER to «AUDIO UNIT»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#audio-unit-system) . TEST the system for normal operation. No : REPAIR the circuit. TEST the system for normal operation.
  5. G5 CHECK FOR CORRECT AUDIO CONTROL UNIT OPERATION Disconnect the audio control unit connectors. Check for: corrosion pushed-out pins Connect the audio control unit connectors and make sure they seat correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes : REMOVE the audio control unit. REFER to «AUDIO UNIT»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#audio-unit-system) . SEND it to an authorized repair facility. TEST the system for normal operation after the repair. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

The subwoofer speaker is powered from a separate subwoofer amplifier. The enable/clip circuit, 174 (GY/BK), carries out 2 functions: to turn on the subwoofer amplifier, and to indicate to the audio control unit when the subwoofer output distortion signal reaches a damaging level. The audio control unit then reduces the audio output signal to the subwoofer amplifier. The subwoofer amplifier receives voltage on circuit 1678 (WH/VT) and ground on circuit 1204 (BK/OG).

  1. circuit 720 (RD/YE) open
  2. circuit 174 (GY/BK) open or short to ground
  3. circuit 176 (PK/LG) open or short to ground
  4. circuit 179 (OG/RD) open or short to ground
  5. circuit 1204 (BK/OG) open
  6. subwoofer amplifier
  7. subwoofer
  8. audio control unit

Scheme 27

Scheme 27: Testing
Scheme 27: Testing

Scheme 28

Scheme 28
Scheme 28

Scheme 29

Scheme 29
Scheme 29

Scheme 30

Scheme 30
Scheme 30

Scheme 31

Scheme 31
Scheme 31

Scheme 32

Scheme 32
Scheme 32

Scheme 33

Scheme 33
Scheme 33

Scheme 34

Scheme 34
Scheme 34
  1. H1 CHECK SUBWOOFER OPERATION Key in ON position. Turn on the audio control unit. Does the subwoofer sound operate correctly? Yes : The system is operating OK. No : GO to H2.
  2. H2 CHECK CIRCUIT 174 (GY/BK) FOR VOLTAGE Key in OFF position. Disconnect: Subwoofer Amplifier C3041 or C466a. Key in ON position. Turn on the audio control unit. Measure the voltage between the subwoofer amplifier C3041-1 or C466a-1, circuit 174 (GY/BK), harness side and ground. Is the voltage greater than 4.1 volts? Yes : GO to H3. No : GO to H8 .
  3. H3 CHECK CIRCUIT 1678 (WH/VT) FOR VOLTAGE Measure the voltage between the subwoofer amplifier C3041-5 or C466a-5, circuit 1678 (WH/VT), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to H4. No : REPAIR the circuit. TEST the system for normal operation.
  4. H4 CHECK CIRCUIT 1204 (BK/OG) FOR AN OPEN Measure the resistance between the subwoofer amplifier C3041-2 or C466a-2, circuit 1204 (BK/OG), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to H5. No : REPAIR the circuit. TEST the system for normal operation.
  5. H5 CHECK FOR AN OUTPUT SIGNAL FROM THE AUDIO CONTROL UNIT Key in ON position. Turn the audio control unit on. Measure the voltage between the subwoofer amplifier C3041-7 or C466a-7, circuit 176 (PK/LG), harness side and the subwoofer amplifier C3041-8 or C466a-8, circuit 179 (OG/RD), harness side. Is there a fluctuating AC voltage? Yes : GO to H11 . No : GO to H6.
  6. H6 CHECK CIRCUITS 176 (PK/LG) AND 179 (OG/RD) FOR AN OPEN Key in OFF position. Disconnect: Audio Control Unit C240b. Measure the resistances between the subwoofer amplifier C3041-7 or C466a-7, circuit 176 (PK/LG), harness side and the audio control unit C240b-1, circuit 176 (PK/LG), harness side; and between subwoofer amplifier C3041-8 or C466a-8, circuit 179 (OG/RD), harness side and the audio control unit C240b-2, circuit 179 (OG/RD), harness side. Is the resistance less than 5 ohms? Yes : GO to H7. No : REPAIR the circuit in question. TEST the system for normal operation.
  7. H7 CHECK CIRCUITS 176 (PK/LG) AND 179 (OG/RD) FOR AN OPEN Measure the resistances between the subwoofer amplifier C3041-7 or C466a-7, circuit 176 (PK/LG), harness side and ground; and between subwoofer amplifier C3041-8, circuit 179 (OG/RD), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : GO to H10 . No : REPAIR the circuit in question. TEST the system for normal operation.
  8. H8 CHECK CIRCUIT 174 (GY/BK) FOR AN OPEN Measure the resistance between the subwoofer amplifier C3041-1 or C466a-1, circuit 174 (GY/BK), harness side and the audio control unit C240b-4, circuit 174 (GY/BK), harness side Is the resistance less than 5 ohms? Yes : GO to H9. No : REPAIR the circuit. TEST the system for normal operation.
  9. H9 CHECK CIRCUIT 174 (GY/BK) FOR AN OPEN AND A SHORT TO GROUND Measure the resistance between the subwoofer amplifier C3041-1 or C466a-1, circuit 174 (GY/BK), harness side and ground. Is the resistance greater than 10,000 ohms? Yes : GO to H10. No : REPAIR the circuit. TEST the system for normal operation.
  10. H10 CHECK FOR CORRECT AUDIO CONTROL UNIT OPERATION Disconnect the audio control unit connectors. Check for: corrosion pushed-out pins Connect the audio control unit connectors and make sure they seat correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes : REMOVE the audio control unit. REFER to «AUDIO UNIT»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#audio-unit-system) . SEND it to an authorized repair facility. TEST the system for normal operation after the repair. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  11. H11 CHECK FOR CORRECT SUBWOOFER AMPLIFIER OPERATION Disconnect the subwoofer amplifier connectors. Check for: corrosion pushed-out pins Connect the subwoofer amplifier connectors and make sure they seat correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes : REMOVE the subwoofer amplifier. REFER to «AUDIO UNIT»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#audio-unit-system) . SEND it to an authorized repair facility. TEST the system for normal operation after the repair. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.

The DVD player receives a wake up signal from the audio control unit through the CAN. The DVD player is powered through circuit 1563 (LG) and grounded on circuit 1204 (BK/OG). When a video disc is inserted into the DVD player and the PLAY button is pressed, an image is displayed on the screen and a stereo signal is transmitted to the audio control unit on circuits 1803 (WH), 1804 (LG), 1805 (RD) and 1806 (BK).

  1. circuit 1563 (LG) open
  2. circuit 1204 (BK/OG) open
  3. circuit 2180 (WH/BK) open or short to ground
  4. circuit 2181 (BK/YE) open or short to ground
  5. circuit 1803 (WH) open or short to ground
  6. circuit 1804 (LG) open or short to ground
  7. circuit 1805 (RD) open or short to ground
  8. circuit 1806 (BK) open or short to ground
  9. audio control unit
  10. DVD player

Scheme 35

Scheme 35
Scheme 35

Scheme 36

Scheme 36
Scheme 36

Scheme 37

Scheme 37
Scheme 37

Scheme 38

Scheme 38
Scheme 38
  1. I1 VERIFY THE OPERATION OF THE AUDIO CONTROL UNIT Key in ON position. Operate the audio control unit. Adjust the speaker controls front to rear, and left to right. Check for sound from the speakers. Is the audio control unit operating correctly? Yes : GO to I2. No : GO to «PINPOINT TEST C»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) .
  2. I2 VERIFY THE OPERATION OF THE DVD PLAYER Insert a known good DVD into the DVD player. Is an image displayed on the screen? Yes : If the DVD player turns on and there is no audio, GO to I7 . No : GO to I3.
  3. I3 CHECK THE VOLTAGE TO THE DVD PLAYER Key in OFF position. Disconnect: DVD C9029. Key in ON position. Measure the voltage between the DVD player C9029-1, circuit 1563 (LG), harness side and ground. Is the voltage greater than 10 volts? Yes : GO to I4. No : REPAIR the circuit. TEST the system for normal operation.
  4. I4 CHECK CIRCUIT 1204 (BK/OG) FOR AN OPEN Key in OFF position. Measure the resistance between the DVD player C9029-14, circuit 1204 (BK/OG), harness side and ground. Is the resistance less than 5 ohms? Yes : GO to I5. No : REPAIR the circuit. TEST the system for normal operation.
  5. I5 CHECK CIRCUITS 2180 (WH/BK) AND 2181 (BK/YE) FOR AN OPEN Key in OFF position. Disconnect: Audio Control Unit C240c. Measure the resistance between the DVD player C9029-10, circuit 2180 (WH/BK), harness side and the audio control unit C240c-15, circuit 2180 (WH/BK), harness side; and between the DVD player C9029-20, circuit 2181 (BK/YE), harness side and the audio control unit C240c-16, circuit 2181 (BK/YE), harness side. Are the resistances less than 5 ohms? Yes : GO to I6. No : REPAIR the circuit in question. TEST the system for normal operation.
  6. I6 CHECK CIRCUITS 2180 (WH/BK) AND 2181 (BK/YE) FOR A SHORT TO GROUND Measure the resistance between the DVD player C9029-10, circuit 2180 (WH/BK), harness side and ground; and between the DVD player C9029-20, circuit 2181 (BK/YE), harness side and ground. Are the resistances greater than 10,000 ohms? Yes : REMOVE the DVD player. REFER to «VIDEO SYSTEM»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#video-system) . SEND it to an authorized repair facility. TEST the system for normal operation after the repair. No : REPAIR the circuit in question. TEST the system for normal operation.
  7. I7 CHECK THE AUDIO CIRCUITS FOR AN OPEN Disconnect: Audio Control Unit C240c. Disconnect: DVD Player C9029. Measure the resistance between the audio control unit and the DVD player. Refer to the following table «AUDIO CONTROL UNIT FUNCTION»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) for correct location, connector, pin and circuit information. AUDIO CONTROL UNIT FUNCTION Audio Function Audio Control Unit DVD player Circuit LH signal C240c-l C9029-5 1803 (WH) LH return C240c-2 C9029-15 1804 (LG) RH signal C240c-9 C9029-6 1805 (RD) RH return C240c-10 C9029-16 1806 (BK) Are the resistances less than 5 ohms? Yes : GO to I8. No : REPAIR the circuit(s) in question. TEST the system for normal operation.
  8. I8 CHECK AUDIO CIRCUITS FOR AN OPEN Measure the resistance between the DVD player and ground. Refer to the following table «AUDIO CONNECTOR CIRCUITS»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#entertainment-system-general-information) for correct location, connector, pin and circuit information. AUDIO CONNECTOR CIRCUITS Function Connector - Pin Circuit LH signal C9029-5 1803 (WH) LH return C9029-15 1804 (LG) RH signal C9029-6 1805 (RD) RH return C9029-16 1806 (BK) Are the resistances greater than 10,000 ohms? Yes : REMOVE the DVD player. REFER to «VIDEO SYSTEM»(/ford/five-hundred/i-2004-2007/remont/entertainment-systems/#video-system) . SEND it to an authorized repair facility. TEST the system for normal operation after the repair. No : REPAIR the circuit(s) in question. TEST the system for normal operation.

More articles — Accessories & Equipment