Information System and Entertainment System: Overview Ford Flex I

Principles of Operation

Note. The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

Normal Operation

The AM/FM antenna receives AM and FM radio waves. The antenna cable transfers the radio waves to the Audio Control Module (ACM). The ACM powers the AM/FM antenna in order to amplify the AM signal.

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

The RDS function allows the vehicle operator to choose which genre (category) of music to listen to. When the SCAN button is pressed, the ACM only stops at channels falling within the selected category. If no channel in the selected category is found, the ACM continues to scan without stopping. This may appear to be a reception issue, but it is actually due to the customer setting.

1. DTC B1A56:21 (Antenna: Signal Amplitude [] Minimum) - sets when the signal strength is less than the pre-configured threshold value during the self-test. This DTC applies to vehicles with navigation only.
2. DTC B2103 (Antenna Not Connected) - sets when the signal strength is less than the preconfigured threshold value during the self-test. This DTC applies to vehicles without navigation only.

This pinpoint test is intended to diagnose the following

1. No channel found in the selected category
2. Wiring, terminals or connectors
3. Antenna
4. AM/FM antenna cable
5. Charging system
6. Ignition system
7. Noise suppression equipment
8. ACM

The Audio Control Module (ACM) directs audio signals to the speakers in the form of an AC voltage. The ACM provides internal circuit protection for shorts to ground or shorts to voltage.

If the vehicle is equipped with the family entertainment system, the rear channel audio signals from the ACM route to the Rear Entertainment Module (RETM), then to the amp or speakers. In dual-play mode, the RETM mutes the rear speaker output. Make sure the audio system is in single-play mode before diagnosing a rear speaker concern.

A short to ground or short to 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, and this pinpoint test should be followed to isolate the damaged circuit.

1. DTC B2965 (Audio System Speaker Circuit Fault) - sets when an open, short to ground, or short to voltage is detected on any of the speaker circuits. If the ACM activates the built-in overload protection, DTC B1342 may also be set. The cause of DTC B2965 must be repaired before DTC B1342 can be cleared.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Speaker
3. ACM
4. RETM (if equipped)

The Audio Control Module (ACM) directs audio signals to the audio Digital Signal Processing (DSP) module in the form of an AC voltage. The audio DSP module sends audio signals to the subwoofer amplifier. The amplifiers boost the audio signals and send them to the speakers. The ACM provides internal circuit protection for shorts to ground or shorts to voltage.

If the vehicle is equipped with the family entertainment system, the rear channel audio signals from the ACM route to the Rear Entertainment Module (RETM), then to the audio DSP module. In dual-play mode, the RETM mutes the rear speaker output. Make sure the audio system is in single-play mode before diagnosing a speaker concern by confirming the headphone icon is displayed in the ACM display.

A short to ground or short to 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, and this pinpoint test should be followed to isolate the damaged circuit.

The amplifiers are enabled by individual enable/clip circuits. To enable the audio DSP module, the ACM sends voltage through the enable/clip circuit. The audio DSP module controls the enable circuit to the subwoofer amplifier. The circuits act as both an output (to enable the amplifier) and an input (to detect an amplifier overload condition). A variable resistor in the amplifier modifies the enable voltage signal. In the event of an overload, the ACM (all speakers except subwoofer) or audio DSP module (subwoofer speaker) clips the audio output signal to the amplifier (heard as distortion), in order to prevent damage to the amplifier and the speakers.

The enable/clip status is based on the following voltages, as detected by the component originating the enable voltage

1. Less than 0.4 volt: amplifier disabled
2. Between 3.8 and 6.7 volts: amplifier enabled
3. Greater than 8.5 volts: amplifier clipped

If the subwoofer amplifier is found to be the cause of the concern, it is only serviced as an assembly with the subwoofer speaker and enclosure.

Non-Navigation ACM DTCs

1. DTC B2965 (Audio System Speaker Circuit Fault) - sets when an open, short to ground, or short to voltage is detected on any of the speaker circuits to the audio DSP module. If the ACM activates the built-in overload protection, DTC B1342 may also be set. The cause of DTC B2965 must be repaired before DTC B1342 can be cleared.

Navigation ACM DTCs

Note. These DTCs only set when a fault is detected in the circuitry between the ACM and the audio DSP module.

DTC DESCRIPTION AND FAULT TRIGGER CONDITIONS

Audio Digital Signal Processing (DSP) Module DTCs

Note. These DTCs only set when a fault is detected in the circuitry between the audio DSP module and the speaker.

AUDIO DIGITAL SIGNAL PROCESSING (DSP) MODULE DTCs

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Speaker
4. Subwoofer amplifier
5. Audio DSP module
6. RETM (if equipped)
7. ACM

When the ignition is in the START position, voltage is supplied to the Audio Control Module (ACM) through the START sense circuit. When the ACM receives this voltage, it mutes the speaker output to prevent popping in the speakers as a result of voltage spikes during engine cranking; however, if there is a short to voltage on this circuit, the ACM continuously mutes the audio output, resulting in no sound from all speakers.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. ACM

When the ignition is in the START position, voltage is supplied to the Audio Control Module (ACM) through the START sense circuit. When the ACM receives this voltage, it mutes the speaker output by removing the enable voltage to the audio Digital Signal Processing (DSP) module. This prevents popping in the speakers as a result of voltage spikes during engine cranking.

If there is a short to voltage on the enable circuit, the ACM continuously mutes the audio output, resulting in no sound from all speakers.

To enable the audio DSP module, the ACM sends voltage through the enable/clip circuit. The circuit acts as both an output (to enable the amplifier) and an input (to detect an amplifier overload condition). The voltage sent by the ACM passes through a variable resistor in the audio DSP module, then to ground. As the audio DSP module reaches maximum output, the resistance in the variable resistor decreases. This decreases the voltage drop, resulting in the ACM detecting a higher voltage on the enable/clip circuit. When the voltage reaches the clip threshold, the ACM clips the audio output signal to the amplifier (heard as distortion), in order to prevent damage to the amplifier and speakers.

The enable/clip status is based on the following voltages, as detected by the ACM

1. Less than 0.4 volt: amplifier disabled
2. Between 3.8 and 6.7 volts: amplifier enabled
3. Greater than 8.5 volts: amplifier clipped

An open in the enable/clip circuit causes the audio system to produce no sound, because the enable signal does not reach the audio DSP module. A short to ground or short to voltage can cause severe distortion to be heard in all of the speakers.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Audio DSP module
4. ACM

When a button is pressed on the Front Controls Interface Module (FCIM), a signal is broadcast over the Medium Speed Controller Area Network (MS-CAN) to the modules in the audio system. The FCIM is also the customer interface with the HVAC module.

If the FCIM can no longer communicate on the MS-CAN (due to loss of power, ground, etc.), the audio system remains in the operating state it was in prior to the failure. The steering wheel controls should continue to operate.

1. DTC B2924 (Audio Button Stuck) - set by the non-navigation FCIM if a button is detected as active for greater than 3 seconds during the self-test, or for greater than 2 minutes during normal operation. When this occurs, the FCIM disables the button until it detects the button as no longer active.
2. DTC U2013:63 (Switch Pack: Circuit/Component Protection Time-Out) - set by the navigation FCIM if a button is detected as active for greater than 3 seconds during the self-test, or for greater than 2 minutes during normal operation. When this occurs, the FCIM disables the button until it detects the button as no longer active.

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. FCIM

The Front Display Interface Module (FDIM) receives power at all times. The ignition switch position message is broadcast to the FDIM by the Smart Junction Box (SJB) via the Medium Speed Controller Area Network (MS-CAN).

Information from the audio system, the climate control system, the SYNC system, and the compass heading are shown on the FDIM display screen. If only one of these displays has a concern, GO to PINPOINT TEST H .

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. FDIM

The Front Display Interface Module (FDIM) receives inputs via the Medium Speed Controller Area Network (MS-CAN) from the following modules

1. Audio Control Module (ACM): audio system information
2. Instrument Cluster (IC): compass heading information
3. Rear Entertainment Module (RETM): family entertainment system information
4. Accessory Protocol Interface Module (APIM): SYNC system information
5. HVAC module: climate control system information

If the FDIM loses the signal from any of these modules, only that specific display is inoperative.

For the compass display, this pinpoint test is intended to diagnose a concern of the compass display being blank. For any other concerns with the compass display, including the compass being inaccurate, Refer to ELECTRONIC COMPASS .

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. FDIM

The Audio Control Module (ACM) enables the Front Display Interface Module (FDIM) by sending voltage through the enable circuit.

Video display information is sent to the FDIM from the ACM through a dedicated video cable. The video cable is only serviced by overlaying a new component.

If there is a fault in the video cable, the FDIM may illuminate very dimly and have a greyish appearance.

This is because the enable circuit is still active and enables the illumination, but no video signal reaches the FDIM .

If the vehicle is equipped with a rear view camera, the video feed from the camera is hardwired to the FDIM .

For all other display information, including the climate control and SYNC system displays, messages are sent to the ACM via the Medium Speed Controller Area Network (MS-CAN). The ACM then alters the video feed to the FDIM based on the messages it receives.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. FDIM
4. ACM

The Front Display Interface Module (FDIM) touchscreen sends a voltage signal to the Audio Control Module (ACM) when a touch sector is pressed. The ACM then takes the appropriate action, which can be a change in the audio system setting or broadcasting the information to the appropriate module through the Medium Speed Controller Area Network (MS-CAN).

1. DTC U0162:00 (Lost Communication With Navigation Display Module: No Sub Type Information) - set by the ACM if it does not detect the FDIM for greater than 5 seconds with the ignition in the RUN position. When this occurs, the touchscreen controls are inoperative and the FDIM may not display correct (if any) information.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. FDIM
3. ACM

The Front Display Interface Module (FDIM) display provides information based on the video signal from the Audio Control Module (ACM). In addition to the information that the ACM controls for the navigation and audio system, the ACM receives inputs via the Medium Speed Controller Area Network (MS-CAN) from the following modules

1. Accessory Protocol Interface Module (APIM): SYNC system information (if equipped)
2. Rear Entertainment Module (RETM): family entertainment system information (if equipped)
3. HVAC module: climate control system information

If the ACM loses the signal from any of these modules, only that specific display becomes inoperative.

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. FDIM
3. ACM

Video from a DVD played in the Audio Control Module (ACM) is transmitted to the Front Display Interface Module (FDIM) through dedicated video circuits. This video feed is separate from all other video sources, so it is possible for the FDIM to operate correctly until a DVD video is played.

DVD video playback through the ACM is only enabled when the vehicle is in PARK. In all other gears, only the DVD audio is played. This is normal operation.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. FDIM
3. ACM

There are 4 different steering wheel controls configurations

1. Non-navigation, without the SYNC system VOL-, VOL+, SEEK-, SEEK+, MEDIA All switches are wired to the Audio Control Module (ACM).
2. Non-navigation, with the SYNC system VOL-, VOL+, SEEK-, SEEK+, VOICE, MEDIA, PHONE, OK The VOL-, VOL+, SEEK- and SEEK+ switches are wired to the ACM . The remaining switches are wired to the Accessory Protocol Interface Module (APIM).
3. Navigation, without the SYNC system VOL-, VOL+, SEEK-, SEEK+, VOICE, MEDIA All switches are wired to the ACM .
4. Navigation, with the SYNC system VOL-, VOL+, SEEK-, SEEK+, VOICE, MEDIA, PHONE All switches are wired to the ACM .

Voltage is sent from the APIM (or ACM ) to the steering wheel controls, and the same module grounds the return circuit. The VOL-, VOL+, SEEK- and SEEK+ switches share signal and return circuits, while the VOICE, MEDIA, PHONE and OK switches share a separate set of signal and return circuits.

For all configurations, when a switch is pressed, the voltage is routed through a specific resistor value for each function. The ACM (or APIM ) then uses the reference voltage to determine which control input function has been selected.

DTC DESCRIPTION AND FAULT TRIGGER CONDITIONS

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Clockspring
3. Steering wheel controls
4. ACM
5. APIM (without navigation only)

The speed sensitive volume function adjusts the volume based on the Vehicle Speed Sensor (VSS) signal from the Instrument Cluster (IC). The IC does not generate the VSS signal; it gateways the signal from the PCM. The Smart Junction Box (SJB) also receives this signal and should exhibit symptoms if the signal is lost.

This pinpoint test is intended to diagnose the following

1. Speed sensitive volume setting
2. VSS signal concern
3. Communication network concern
4. ACM

The Audio Control Module (ACM) receives the volume cutback message from the Instrument Cluster (IC). The IC does not generate the volume cutback message; it gateways the signal from the Parking Aid Module (PAM). When the PAM sounds the parking aid tone, it broadcasts an enabled message over the Controller Area Network (CAN). When the ACM receives this message, it reduces the speaker output so that the parking aid tone can be heard more easily.

This pinpoint test is intended to diagnose the following

1. Parking aid system concern
2. ACM

When the VOICE switch is pressed, it changes the reference voltage from the Audio Control Module (ACM) on the voice recognition circuit and the ACM enters voice recognition mode. A microphone located in the auto-dimming interior mirror receives the voice command and sends a signal to the ACM .

The microphone test is available through the scan tool or through the ACM self-diagnostic mode. Running this test causes the ACM to produce a test tone. If the system is operating correctly, the microphone detects the tone and produces a signal to the ACM indicating the tone was heard.

1. DTC B1D79:01 (Microphone Input: General Electrical Failure) - set by the ACM during the microphone test when it does not receive an adequate signal from the microphone when the test tone is sounded.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Steering wheel controls system concern
4. Microphone (part of the auto-dimming interior mirror)
5. ACM

Normal Operation - Vehicles Without Navigation

When the VOICE switch is pressed, it changes a reference voltage signal and the audio system enters voice recognition mode. The VOICE switch is wired to the Accessory Protocol Interface Module (APIM). A microphone located in the auto-dimming interior mirror receives the voice command and sends a signal to the APIM . The microphone is also used to detect outgoing audio during a phone call.

Vehicles With Navigation

When the VOICE switch is pressed, it changes a reference voltage signal and the audio system enters voice recognition mode. The VOICE switch is wired to the Audio Control Module (ACM). A microphone located in the auto-dimming interior mirror receives the voice command and sends a signal to the APIM . The APIM receives the microphone input and also broadcasts it to the ACM . The first voice commands spoken determine which system handles the voice commands.

The microphone test is available through the scan tool or through the ACM self-diagnostic mode. Running this test causes the ACM to produce a test tone. If the system is operating correctly, the microphone detects the tone and produces a signal to the ACM indicating the tone was heard.

1. DTC B1D79:01 (Microphone Input: General Electrical Failure) - set by the navigation ACM during the microphone test when it does not receive an adequate signal from the microphone when the test tone is sounded.
2. DTC B1D79:01 (Microphone Input: General Electrical Failure) - set by the APIM during the on-demand self-test when it does not detect the microphone.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Steering wheel controls
4. Microphone (part of the auto-dimming interior mirror)
5. ACM (if equipped with navigation)
6. APIM

Digital signals are received by the satellite radio antenna and sent to the Audio Control Module (ACM) through the satellite radio antenna cable. The satellite receiver is internal to the ACM .

When a satellite radio subscription is activated, the Electronic Serial Number (ESN) of the built-in satellite receiver is associated with the Vehicle Identification Number (VIN). As a result, the ACM cannot be swapped from one vehicle to another.

If there is an open in the satellite radio antenna circuit, there is no satellite audio. The audio system display indicates a satellite antenna concern when the audio system is operated in satellite radio mode. To diagnose an open in the satellite radio antenna circuit, GO to PINPOINT TEST S .

1. DTC U2014:96 (Control Module Hardware: Component Internal Failure) - sets when the ACM detects an internal fault to the built-in satellite radio receiver. This results in complete loss of satellite radio functionality. This DTC only applies to vehicles with navigation.

This pinpoint test is intended to diagnose the following

1. Subscription status
2. ACM

Digital signals are received by the satellite radio antenna and sent to the Audio Control Module (ACM), as the satellite radio receiver is built-in to the ACM .

A short to ground in the satellite radio antenna typically has no effect on the antenna signal. However, an open in the antenna circuit results in no sound from the satellite radio system. A short to voltage in the antenna circuit can have varying effects on the system.

Obstructions to the antenna line of sight can affect reception, but this is considered normal operation. Possible obstructions include hills, tall buildings, tunnels, and being parked inside a garage. Be sure the vehicle is in a clear area, free of obstructions, before testing satellite radio reception.

DTC DESCRIPTION AND FAULT TRIGGER CONDITIONS

This pinpoint test is intended to diagnose the following

1. Obstructions to the antenna line of sight
2. No channel found in the selected category
3. Satellite radio antenna cable
4. Antenna
5. ACM

The Global Positioning System (GPS) antenna provides information from the GPS satellite system to the Audio Control Module (ACM). This information is used to calculate vehicle position and direction of travel.

1. DTC B119F:01 ( GPS Antenna: General Electrical Failure) - sets when any failure is detected in the GPS antenna circuit.
2. DTC B119F:13 ( GPS Antenna: Circuit Open) - sets when an open is detected in the GPS antenna circuit.

This pinpoint test is intended to diagnose the following

1. GPS antenna
2. ACM

The primary source of vehicle location for the navigation system is the Audio Control Module (ACM) receiving the position signal through the Global Positioning System (GPS) antenna.

In addition, the ACM receives the navigation rolling wheel count signal from the Instrument Cluster (IC) (which gateways the signal from the ABS module). This secondary signal is used to calculate vehicle position when the GPS signal is lost. It also supports the adaptive learning function of the ACM , whereby the ACM can compensate for long-term differences between the GPS signal location and the actual distance traveled by the vehicle.

If DTC B119F:01 or DTC B119F:13 is present, GO to PINPOINT TEST T to diagnose a concern with the GPS antenna.

1. DTC U2014:09 (Control Module Hardware: Component Failure) - sets when the ACM detects a fault in the internal gyroscope. The gyroscope is not serviceable.

This pinpoint test is intended to diagnose the following

1. GPS antenna concern
2. Network message concern
3. ACM

The voice-assisted route guidance is broadcast through the instrument panel speaker. The volume can be adjusted using the settings on the Audio Control Module (ACM). The ACM sends the voice guidance audio signals to the audio Digital Signal Processing (DSP) module through a dedicated pair of circuits.

The voice guidance volume can be changed by the customer.

1. DTC B1A07:01 (Speaker #7: General Electrical Failure) - sets when a fault is detected in the navigation audio circuits.

This pinpoint test is intended to diagnose the following

1. Incorrect voice guidance setting
2. Wiring, terminals or connectors
3. Audio DSP module
4. ACM

Normal Operation - Vehicles Without the SYNC System

Audio signals are sent from the audio input jack to the Audio Control Module (ACM). There are no external power or ground circuits to the audio input jack.

Vehicles With the SYNC System

Audio signals are sent from the audio input jack to the Accessory Protocol Interface Module (APIM). The signals are then sent to the ACM . There are no external power or ground circuits to the audio input jack.

1. DTC B1D78:13 (Auxiliary Input: Circuit Open) - sets in continuous memory by the navigation ACM (vehicles without the SYNC system only) when an open is detected in the audio input jack circuitry for greater than 250 milliseconds.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Audio input jack
3. APIM (vehicles with the SYNC system)
4. ACM (vehicles without the SYNC system)

When a button on the Front Controls Interface Module (FCIM) is pressed, a network message is broadcast to the Accessory Protocol Interface Module (APIM) via the Medium Speed Controller Area Network (MS-CAN). The APIM takes the appropriate action and sends a status message to the Front Display Interface Module (FDIM) (vehicles without navigation) or the Audio Control Module (ACM) (vehicles with navigation) in order to update the display screen.

If the vehicle is equipped with the family entertainment system, the APIM sends data to the Rear Entertainment Module (RETM) via the MS-CAN . This information includes metadata, which can be displayed in the DVD player.

This pinpoint test is intended to diagnose the following

1. Audio system concern
2. Communication network concern
3. Customer error
4. Customer device

When a new Bluetooth device is added, the Accessory Protocol Interface Module (APIM) and the Bluetooth device must be paired together. Most Bluetooth devices can pair with the SYNC system, although functionality may vary. To determine if a Bluetooth device is supported, retrieve the Consumer Interface Processor (CIP) software level using the ACCESSORY PROTOCOL INTERFACE MODULE (APIM) SOFTWARE LEVEL CHECK and verify the customer device is on the compatibility list for the current CIP software level.

Pairing a Bluetooth device is accomplished through the "Add Device" selection of the phone menu. When pairing a device, the SYNC system generates a unique Personal Identification Number (PIN) that must be entered on the Bluetooth device in order for the pairing process to be successful. There are also some device-specific actions that must take place. For additional information on the pairing process, refer to the Owner's Literature.

This pinpoint test is intended to diagnose the following

1. Incompatible Bluetooth device
2. Customer error
3. Customer Bluetooth device
4. APIM

The Universal Serial Bus (USB) port is connected to the Accessory Protocol Interface Module (APIM) through the USB cable. The USB port can be used to play audio files or upload software from mass storage devices, or for connecting a media device.

If supported by the user device, the USB can provide charging. Because of this feature, when a USB device is plugged into the USB port, the SYNC system does not automatically switch to the device.

If a USB mass storage device is used to play an audio file, SYNC only plays audio files that do not have Digital Rights Management (DRM) protection.

The USB cable and port are not serviceable separately.

1. DTC B1252:04 ( USB Port: System Internal Failure) - sets when the APIM detects an overtemperature condition in the USB circuit. This can be caused by a fault in the USB cable and port, or by the customer USB device.
2. DTC B1252:11 ( USB Port: Circuit Short to Ground) - sets when the APIM detects an over-current condition in the USB circuit. This can be caused by a fault in the USB cable and port, or by the customer USB device.

This pinpoint test is intended to diagnose the following

1. Customer USB device
2. USB cable and port
3. APIM

The Accessory Protocol Interface Module (APIM) transmits left and right channel analog audio signals. These signals include inputs from the Universal Serial Bus (USB) port, the audio input jack, and a Bluetooth media device.

If the vehicle is equipped with the family entertainment system, these audio signals are sent to the Rear Entertainment Module (RETM), then to the Audio Control Module (ACM). For vehicles without the family entertainment system, the audio signals are sent directly to the ACM .

If a USB mass storage device is used to play an audio file, the SYNC system only plays audio files that do not have Digital Rights Management (DRM) protection.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. RETM (if equipped)
3. APIM
4. ACM

The Text-To-Speech (TTS) and voice prompt features speak certain text information and interaction requests in order to minimize driver distraction by having to look at the audio system display while driving. The ringtone alerts the driver to an incoming call.

Audible prompts can range from a simple tone to more elaborate spoken text, based on the customer setting. When interaction mode is set to standard, detailed guidance is provided. When interaction mode is set to advanced, most prompts are tones only and minimal audible guidance is provided. Refer to the Owner's Literature for further information on voice interaction.

The audio signals for the TTS and voice prompt features, the ringtones, and audio from the outside device during a phone call are sent from the Accessory Protocol Interface Module (APIM) to the Audio Control Module (ACM).

This pinpoint test is intended to diagnose the following

1. Customer setting
2. Wiring, terminals or connectors
3. APIM
4. ACM

Each DVD player displays video from a DVD inserted into that screen. In addition, the source can be changed so that both DVD players display video from the same DVD player. Each DVD player sends video signals to the Rear Entertainment Module (RETM) through a pair of circuits. Based on the source selected, the RETM can send the video data to the other screen.

If there is a fault in the video circuits or in the RETM , the video can still operate correctly on the DVD player that is playing the current DVD, but the other screen will be blank when the source is changed to the other DVD player.

1. DTC B119D:04 (Single-Disc DVD Player: System Internal Failure) - sets when the RETM detects a fault in the LH DVD player for greater than 15 seconds during normal operation. This DTC can also be set by a connector that is not seated correctly. Make sure all connectors are seated correctly before continuing with the diagnostics.
2. DTC B1350:04 (Single-Disc DVD #2: System Internal Failure) - sets when the RETM detects a fault in the RH DVD player for greater than 15 seconds during normal operation. This DTC can also be set by a connector that is not seated correctly. Make sure all connectors are seated correctly before continuing with the diagnostics.

This pinpoint test is intended to diagnose the following

1. Incorrect customer setting
2. Damaged DVD
3. Wiring, terminals or connectors
4. DVD player
5. RETM

Each DVD player sends wireless audio signals to the headphones. In dual-play mode, the audio to the rear speakers is muted and the DVD players continue to control the rear audio source to the headphones. When the headphones are set to channel A, only the audio sources for the LH DVD player can be accessed. When the headphones are set to channel B, only the audio sources for the RH DVD player can be accessed.

This pinpoint test is intended to diagnose the following

1. Customer setting
2. Headphone batteries
3. Headphones
4. DVD player

Several audio system modules receive network messages from the Smart Junction Box (SJB) via the Medium Speed Controller Area Network (MS-CAN). The following information is included in the messages

1. Ignition switch position
2. Illumination dimmer control
3. Accessory delay status

As more than one module receives each of these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.

1. DTC U0140 (Lost Communication With Body Control Module ( GEM )) - set by the non-navigation Audio Control Module (ACM), the Front Controls Interface Module (FCIM) (without navigation), and the Front Display Interface Module (FDIM) when network messages are missing from the SJB for greater than 5 seconds with the ignition in RUN.
2. DTC U0140:00 (Lost Communication With Body Control Module: No Sub Type Information) - set by the navigation ACM , the FCIM (with navigation), the Accessory Protocol Interface Module (APIM), the audio Digital Signal Processing (DSP) module, the Rear Entertainment Module (RETM), and the Global Positioning System Module (GPSM) when network messages are missing from the SJB for greater than 5 seconds with the ignition in RUN.

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. Audio system concern
3. SJB

1. DTC B1318 (Battery Voltage Low) - set by the non-navigation Audio Control Module (ACM) when the supply voltage falls below 10 volts for at least 10 seconds during normal operation.
2. DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - set by the navigation Audio Control Module (ACM) when the supply voltage falls below 10 volts for at least 10 seconds during normal operation or for greater than 250 milliseconds during the self-test.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. High circuit resistance
3. ACM

1. DTC U3003:17 (Battery Voltage: Circuit Voltage Above Threshold) - set by the Audio Control Module (ACM) when the supply voltage is greater than 15.8 volts for more than 250 milliseconds during normal operation or the self-test.

This pinpoint test is intended to diagnose the following

1. Charging system concern
2. ACM

1. DTC B1318 (Battery Voltage Low) - set by the Front Controls Interface Module (FCIM) (without navigation) when the supply voltage falls below 10 volts for at least 10 seconds during normal operation.
2. DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - set by the FCIM (with navigation) when the supply voltage falls below 10 volts for at least 10 seconds during normal operation, or for greater than 250 milliseconds during the self-test.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. High circuit resistance
3. FCIM

1. DTC U3003:17 (Battery Voltage: Circuit Voltage Above Threshold) - set by the Front Controls Interface Module (FCIM) when the supply voltage is greater than 15.8 volts for more than 250 milliseconds during normal operation or the self-test.

This pinpoint test is intended to diagnose the following

1. Charging system concern
2. FCIM

1. DTC B1318 (Battery Voltage Low) - set by the Front Display Interface Module (FDIM) when the supply voltage falls below 10 volts for at least 10 seconds during normal operation. This DTC applies to vehicles without navigation only.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. High circuit resistance
3. FDIM

1. DTC U3003:17 (Battery Voltage: Circuit Voltage Above Threshold) - set by the Accessory Protocol Interface Module (APIM) when the supply voltage is greater than 15.8 volts for more than 250 milliseconds during normal operation.

This pinpoint test is intended to diagnose the following

1. Charging system concern
2. APIM

1. DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - set by the Accessory Protocol Interface Module (APIM) when the supply voltage falls below 10 volts for at least 10 seconds during normal operation.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. High circuit resistance
3. APIM

1. DTC U3003:17 (Battery Voltage: Circuit Voltage Above Threshold) - set by the Rear Entertainment Module (RETM) when the supply voltage is greater than 16.0 volts for more than 10 seconds during normal operation.

This pinpoint test is intended to diagnose the following

1. Charging system concern
2. RETM

1. DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - set by the Rear Entertainment Module (RETM) when the supply voltage falls below 10 volts for at least 10 seconds during normal operation.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. High circuit resistance
3. RETM

1. DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - set by the audio Digital Signal Processing (DSP) module when the supply voltage falls below 10 volts for at least 10 seconds during normal operation, or for greater than 250 milliseconds during the self-test.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. High circuit resistance
3. Audio DSP module

1. DTC U3003:17 (Battery Voltage: Circuit Voltage Above Threshold) - set by the audio Digital Signal Processing (DSP) module when the supply voltage is greater than 15.8 volts for more than 250 milliseconds during normal operation or the self-test.

This pinpoint test is intended to diagnose the following

1. Charging system concern
2. Audio DSP module

Several audio system modules receive network messages from the Accessory Protocol Interface Module (APIM) via the Medium Speed Controller Area Network (MS-CAN).

As more than one module receives each of these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.

1. DTC U0197 (Lost Communication With Telephone Control Module) - set by the non-navigation Audio Control Module (ACM) or the Front Display Interface Module (FDIM) when network messages are missing from the APIM for greater than 5 seconds with the ignition in RUN.
2. DTC U0197:00 (Lost Communication With Telephone Control Module: No Sub Type Information) - set by the navigation Audio Control Module (ACM) or the audio Digital Signal Processing (DSP) module when network messages are missing from the APIM for greater than 5 seconds with the ignition in RUN.

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. Audio system concern
3. APIM

Several audio system modules receive network messages from the Instrument Cluster (IC) via the Medium Speed Controller Area Network (MS-CAN). The following information is included in the messages

1. Transmission gear selected
2. Vehicle speed
3. Compass heading

As more than one module receives these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.

1. DTC U0155 (Lost Communication With Instrument Panel Cluster ( IC ) Control Panel) - set by the non-navigation Audio Control Module (ACM) or the Front Display Interface Module (FDIM) when network messages are missing from the IC for greater than 5 seconds with the ignition in RUN.
2. DTC U0155:00 (Lost Communication With Instrument Panel Cluster ( IPC ) Control Module: No Sub Type Information) - set by the navigation Audio Control Module (ACM), the Accessory Protocol Interface Module (APIM), the audio Digital Signal Processing (DSP) module, or the Global Positioning System Module (GPSM) when network messages are missing from the IC for greater than 5 seconds with the ignition in RUN.

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. Audio system concern
3. IC

Several audio system modules receive network messages from the Audio Control Module (ACM) via the Medium Speed Controller Area Network (MS-CAN). These messages consist mainly of audio setting information.

As more than one module receives each of these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.

1. DTC U0184 (Lost Communication With Radio ( ACM )) - set by the non-navigation Front Controls Interface Module (FCIM) or the Front Display Interface Module (FDIM) when network messages are missing from the ACM for greater than 5 seconds with the ignition in RUN.
2. DTC U0184:00 (Lost Communication With Radio: No Sub Type Information) - set by the navigation FCIM , the Accessory Protocol Interface Module (APIM), the audio Digital Signal Processing (DSP) module, or the Rear Entertainment Module (RETM) when network messages are missing from the ACM for greater than 5 seconds with the ignition in RUN.

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. Audio system concern
3. ACM

Several audio system modules receive network messages from the Rear Entertainment Module (RETM) via the Medium Speed Controller Area Network (MS-CAN).

As more than one module receives each of these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.

1. DTC U0196 (Lost Communication With Entertainment Control Module - Rear (AUX)) - set by the non-navigation Audio Control Module (ACM) or the Front Display Interface Module (FDIM) when network messages are missing from the RETM for greater than 5 seconds with the ignition in RUN.
2. DTC U0196:00 (Lost Communication With Entertainment Control Module-Rear "A": No Sub Type Information) - set by the navigation ACM , the Accessory Protocol Interface Module (APIM), or the audio DSP module when network messages are missing from the RETM for greater than 5 seconds with the ignition in RUN.

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. Audio system concern
3. RETM

The Accessory Protocol Interface Module (APIM) receives network messages from the PCM via the High Speed Controller Area Network (HS-CAN). These messages include the odometer reading and the fuel level.

As other modules outside of the audio system also receive these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.

1. DTC U0100:00 (Lost Communication With ECM/PCM "A": No Sub Type Information) - set by the APIM when it is missing messages from the PCM over the HS-CAN for greater than 5 seconds with the ignition in the RUN position.

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. PCM

The Accessory Protocol Interface Module (APIM) receives the emergency call (eCall) notification message from the Restraints Control Module (RCM) via the High Speed Controller Area Network (HS-CAN). The APIM uses this message to verify the RCM is configured for the eCall feature and to activate the eCall system when the air bags deploy.

As other modules outside of the audio system also receive this message, all modules receiving it should exhibit a symptom if the message is missing.

1. DTC U0151:00 (Lost Communication With Restraints Control Module: No Sub Type Information) - set by the APIM when it is missing the eCall notification message from the RCM over the HS-CAN for greater than 5 seconds with the ignition in the RUN position.

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. Restraints system concern

1. DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - set by the Global Positioning System Module (GPSM) when the supply voltage falls below 10 volts for at least 10 seconds during normal operation, or for greater than 250 milliseconds during the self-test.

This pinpoint test is intended to diagnose the following

1. Wiring, terminal or connectors
2. High circuit resistance
3. GPSM

The Rear Entertainment Module (RETM) allows for dual-play mode to include separate SYNC system audio sources for each DVD player. To do this, the Accessory Protocol Interface Module (APIM) transmits SYNC system audio signals over an additional set of circuits.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. APIM
3. RETM

Each DVD player has its own buttons. When a button is pressed, a signal is sent to the Rear Entertainment Module (RETM) through a dedicated pair of circuits. The RETM then takes the appropriate action.

1. DTC U2004:63 (Auxiliary Switch Pack: Circuit/Component Protection Time-Out) - sets when the RETM detects a button on the LH DVD player as active for greater than 20 seconds during the self-test, or for greater than 2 minutes during normal operation. When this occurs, the RETM ignores input from the stuck button.
2. DTC U2013:63 (Switch Pack: Circuit/Component Protection Time-Out) - sets when the RETM detects a button on the RH DVD player as active for greater than 20 seconds during the self-test, or for greater than 2 minutes during normal operation. When this occurs, the RETM ignores input from the stuck button.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. DVD player
3. RETM

Each DVD player sends audio signals to the Rear Entertainment Module (RETM) through a dedicated set of circuits. The RETM then sends the audio signals to the Audio Control Module (ACM). The RETM audio output also contains SYNC system audio if the vehicle is equipped with the SYNC system.

In single-play mode, audio from the RETM is broadcast through all vehicle speakers when family entertainment mode is selected. In dual-play mode, the RETM mutes the audio output to the rear speakers so that separate audio can be played on the front speakers, while the headphones continue to broadcast the audio from the family entertainment system.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. DVD player
3. RETM
4. RETM