Information System & Entertainment System: Overview Ford Focus II рестайлинг

Principles of Operation

Note. The smart junction box (SJB) is also known as the generic electronic module (GEM).

Normal Operation

With the key in RUN or ACC, the audio system can be powered on. When the ON button is pressed on the front controls interface module (FCIM), a wake-up signal is sent to the audio control module (ACM), the front display interface module (FDIM), the accessory protocol interface module (APIM) (if equipped), and the satellite digital audio receiver system (SDARS) module (if equipped).

When a button is pressed on the FCIM, there is a corresponding display on the FDIM. The FDIM displays both base audio system information, SYNC information (if equipped), and satellite radio information (if equipped). The information is sent to the FDIM via the medium speed controller area network (MS-CAN).

1. DTC U0184 (Lost Communication With Radio [ACM]) - set by the FCIM when it does not receive status messages from the ACM for greater than 5 seconds. When the ACM status message is lost, FCIM button functionality is lost, rendering the system completely inoperative.
2. DTC U0255 (Lost Communication With Front Controls Interface Module) - set by the ACM when it does not receive status messages from the FCIM for greater than 5 seconds. When the FCIM status message is lost, FCIM button functionality is lost. This results in the audio system remaining in the mode it was in prior to the failure and not recognizing any FCIM button presses.

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. FCIM
3. ACM

When the key is in START, the audio control module (ACM) receives voltage on circuit CBP28 (GY/VT) to prevent voltage spikes from producing a popping noise through the speakers. However, a short to voltage on this circuit will cause the ACM output to be continuously muted. It will also cause the voice recognition to be inoperative.

If the ACM loses power or ground, the scan tool will not be able to communicate with it. Refer to MODULE COMMUNICATIONS NETWORK to continue diagnosis.

If DTC B2965 is set in the ACM, the cause of the concern is a short to ground or short to voltage in the circuitry to an individual speaker, which has caused the ACM overload protection to activate. If DTC B2965 is present, Go to Pinpoint Test C .

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. ACM

The audio control module (ACM) directs audio signals to the speakers in the form of a fluctuating AC voltage. The ACM has an overload protection function that protects the ACM if an over-current condition is present. As a result, if there is a short to ground on the circuitry to any of the 4 interior speakers, the ACM mutes the sound to all of the interior speakers. Only the subwoofer (if equipped) will continue to produce sound.

1. DTC B2965 (Audio System Speaker Circuit Fault) - sets when an open, a short to ground, or a short to voltage is detected on the front or rear speaker circuits. The ACM checks for faults once every 500ms during normal operation, or for any duration during the ACM self-test. On vehicles equipped with Audiophile, the front speakers are not checked for opens. If a short to ground is present, DTC B1342 may also set. The circuit fault 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

The subwoofer amplifier receives voltage through circuit SBP38 (BN/RD) and ground through circuit GD161 (BK/YE). The subwoofer amplifier and the subwoofer speaker cannot be replaced individually.

To enable the subwoofer amplifier, the audio control module (ACM) sends voltage through the enable/clip circuit SME23 (VT/RD). The circuit acts as both an output (to enable the amplifier) and an input (to detect an amplifier overload condition). A variable resistor in the subwoofer amplifier modifies the voltage signal from the ACM. In the event of an overload, the ACM clips the audio output signal to the amplifier (heard as distortion), in order to prevent damage to the amplifier and speakers.

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

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

An open in circuit SME23 (VT/RD) causes the subwoofer to produce no sound, because the enable signal does not reach the subwoofer amplifier. A short to ground or short to voltage can cause severe distortion to be heard in the subwoofer.

This pinpoint test is intended to diagnose the following

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

The radio antenna receives AM and FM radio waves and sends them to the audio control module (ACM).

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

1. DTC B2103 (Antenna Not Connected) - sets during the antenna connected test (part of the ACM self-test) when the signal strength is less than the pre-configured threshold value. In order for this DTC to set, the audio system must be tuned to AM, and the self-test must be run with the scan tool.

This pinpoint test is intended to diagnose the following

1. Antenna
2. Antenna cable
3. Charging system
4. Ignition system
5. Noise suppression equipment
6. ACM

Digital signals are received by the satellite radio antenna and sent to the satellite digital audio receiver system (SDARS) module, which then converts the signals and provides analog audio signals to the audio control module (ACM).

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

1. DTC B1031 (SDARS Satellite Antenna Open) - sets when an open or high resistance is detected in the satellite antenna circuit. This DTC can be either continuous or on-demand.
2. DTC B1032 (SDARS Satellite Antenna Short) - sets when a short to ground or short to voltage is detected in the satellite antenna circuit. This DTC can be either continuous or on-demand.

This pinpoint test is intended to diagnose the following

1. Obstructions to the line of sight
2. Wiring, terminals or connectors
3. Satellite radio antenna cable
4. Satellite radio antenna
5. SDARS module

The front display interface module (FDIM) receives the illumination signal from the smart junction box (SJB), and dims the illumination based on the position of the dimmer switch.

1. DTC U0140 (Lost Communication With Body Control Module [GEM]) - sets when the FDIM is missing messages from the SJB for ignition state, illumination, or delayed accessory. Because a missing ignition state or delayed accessory signal would cause multiple symptoms (since many modules would report this error), only the illumination signal is diagnosed in this pinpoint test.

In order for the FDIM to set DTC U0140, the illumination signal must be missing for greater than 5 seconds. In the event this signal is lost, the FDIM defaults to full nighttime brightness, resulting in a symptom of the FDIM being unable to dim.

This pinpoint test is intended to diagnose the following

1. Backlighting system concern
2. FDIM

The front display interface module (FDIM) receives inputs from multiple modules, and displays that information on the screen. The inputs are in the form of messages delivered via the medium speed controller area network (MS-CAN).

Note. Any of these DTCs can be set when the vehicle experiences a low battery voltage condition, which should also set DTC B1318 in at least 1 module. The low battery voltage condition must be corrected before an accurate diagnosis of a missing message can be made. Also, if no symptoms are currently present, the DTC should be disregarded.

This pinpoint test is intended to diagnose the following

1. FDIM
2. ACM
3. SDARS module (if equipped)
4. APIM (if equipped)

The front controls interface module (FCIM) receives the illumination signal from the smart junction box (SJB), and dims the illumination based on the position of the dimmer switch. The illumination signal is sent via the medium speed controller area network (MS-CAN).

1. DTC U0140 (Lost Communication With Body Control Module [GEM]) - sets when the FCIM is missing messages from the SJB for ignition state, illumination, or delayed accessory. Because a missing ignition state or delayed accessory signal would cause multiple symptoms (since many modules would report this error), only the illumination signal is diagnosed in this pinpoint test.

In order for the FCIM to set DTC U0140, the illumination signal must be missing for greater than 5 seconds. In the event this signal is lost, the FCIM defaults to full nighttime brightness, resulting in a symptom of the FCIM being unable to dim.

This pinpoint test is intended to diagnose the following

1. Backlighting system concern
2. FCIM

The satellite digital audio receiver system (SDARS) module receives voltage through circuit SBP14 (BN/RD) and ground through circuit GD110 (BK/WH). Digital signals are received by the satellite radio antenna and sent to the SDARS module. The digital audio signals are then converted to analog and sent to the audio control module (ACM) or to the accessory protocol interface module (APIM) (if equipped).

If there is an open in the satellite antenna circuit, there will be no satellite audio. The ACM display will indicate a satellite antenna concern (the method varies according to the type of ACM) when the audio system is operated in satellite radio mode. To diagnose an open in the satellite antenna circuit, go to Pinpoint Test F .

The SDARS module transmits left and right channel audio signals. When there is a fault on any of these circuits, the audio quality is reduced. If the circuits for a specific channel are shorted together, loss of audio on that entire channel will occur. This can be detected by using the SDARS module tones test.

In order for the satellite radio system to operate, messages are sent from the front controls interface module (FCIM) to the ACM when a button is pressed. The ACM responds with the appropriate function.

The SDARS module sends messages to the front display interface module (FDIM) in order to display satellite radio information on the display screen.

This pinpoint test is intended to diagnose the following

1. Subscription status
2. Wiring, terminals or connectors
3. SDARS module
4. APIM (if equipped)
5. ACM

The speed sensitive volume function, available with Audiophile only, 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.

1. DTC U0155 (Lost Communication With Instrument Panel Cluster Control [IC] Module) - sets when the VSS signal is lost for greater than 5 seconds. When the signal is lost, the audio control module (ACM) turns the speed sensitive volume feature off. The smart junction box (SJB) also receives this signal, and should demonstrate symptoms if the VSS signal is lost. If no symptoms are present, this DTC can be ignored, as it may have been set by a low battery voltage condition.

This pinpoint test is intended to diagnose the following

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

Two different steering wheel switch configurations are available, depending on whether the vehicle is equipped with the SYNC system.

On vehicles without the SYNC system, all of the steering wheel control switches are wired to the audio control module (ACM). The steering wheel controls are: VOL+, VOL-, SEEK+, SEEK-, and MEDIA. The SEEK+ and SEEK- switches are represented by arrows.

For vehicles equipped with the SYNC system, the steering wheel controls are: VOL+, VOL-, SEEK+, SEEK-, MEDIA, VOICE, PHONE, and OK. The SEEK+ and SEEK- switches are represented by arrows, the VOICE button is represented by an icon of someone speaking, and the PHONE button is represented by an icon of a phone with an up-and-down arrow. The VOICE, PHONE, and OK switches are wired to the accessory protocol interface module (APIM), while the remaining switches are wired to the ACM.

For all switches, a reference voltage is sent from the appropriate module to the steering wheel controls. When a switch is pressed, the voltage is routed through a specific resistor value for each function. The module provides the ground for the reference voltage. The module uses this reference voltage to determine which control input function has been selected.

1. DTC B1117 (Audio Steering Wheel Button Stuck) - set by the ACM or the APIM when a steering wheel control button is detected as active for greater than 120 seconds during normal operation, or for any duration during the self-test. A short to ground in any steering wheel controls circuit should not set this DTC, as the reference voltage would fall out of range, resulting in DTC B1136 (APIM) or B2404 (ACM) being set.
2. DTC B1136 (Audio Steering Wheel Switch #2 Circuit Failure) - set by the APIM when the reference voltage to the steering wheel controls is out-of-range, either during normal operation or during the on-demand self-test. This can be caused by a number of failures on the steering wheel controls circuit except for a stuck button or a short to ground on circuit RME54 (WH/VT).
3. DTC B2404 (Audio Steering Wheel Switch Circuit Fault) - set by the ACM when the reference voltage to the steering wheel controls is out-of-range, either during normal operation or during the on-demand self-test. This can be caused by any failure on the steering wheel controls circuit except for a stuck button or a short to ground on circuit RME24 (BU/WH).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Steering wheel controls
3. Clockspring
4. ACM
5. APIM (if equipped)

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.

The audio control module (ACM) receives the following signals from the smart junction box (SJB) via the medium speed controller area network (MS-CAN)

1. Ignition switch position
2. Illumination
3. Delayed accessory enable

Rather than use a battery feed through the ignition switch, the ignition switch position signal is used to "wake up" the audio system modules. If the SJB is not broadcasting the ignition switch position signal, none of the audio system modules will power-up, resulting in the audio system being completely inoperative.

The illumination signal is sent to multiple modules, including the front controls interface module (FCIM) and the front display interface module (FDIM). If the SJB is not broadcasting the illumination signal, the FDIM and FCIM will default to full nighttime brightness.

The delayed accessory function allows the audio system to be operated for a pre-determined amount of time after the key has been turned to OFF and a front door has not been opened. If the delayed accessory enable message is missing, the audio system defaults to the ignition switch position signal (delayed accessory disabled).

1. DTC U0140 (Lost Communication With Body Control Module [GEM]) - sets when any of the above messages are missing for greater than 5 seconds.

This pinpoint test is intended to diagnose the following

1. Communication network concern
2. SJB
3. ACM

The accessory protocol interface module (APIM) receives voltage at all times from circuit SBP13 (GY/RD), and ground through circuit GD114 (BK/BU). The wake-up signal is sent to the APIM by the audio control module (ACM), via the medium speed controller area network (MS-CAN). All audio sources except the AM/FM tuner and in-dash CD are provided to the ACM from the APIM. Satellite audio, if equipped, is routed through the APIM to the ACM.

Note that the APIM self-test fails if a universal serial bus (USB) device is plugged-in during the test. Make sure there are no USB devices plugged into the USB port when the APIM self-test is run.

1. DTC U0184 (Lost Communication With Radio [ACM]) - sets when the APIM is missing messages from the ACM for greater than 5 seconds. This results in a complete loss of SYNC system functionality.
2. DTC U0197 (Lost Communication With Telephone Control Module) - sets when the ACM is missing messages from the APIM for greater than 5 seconds. This results in a complete loss of SYNC system functionality.
3. DTC U0255 (Lost Communication With Front Controls Interface Module) - sets when the APIM is missing messages from the front controls interface module (FCIM) for greater than 5 seconds. This results in the inability to interact with the SYNC system using the FCIM, although the steering wheel controls should still be able to operate the system if the source of the concern is the network circuitry or the FCIM.

This pinpoint test is intended to diagnose the following

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

When a new Bluetooth device is added, the accessory protocol interface module (APIM) and the Bluetooth device must be paired together. Most Bluetooth devices will pair with the SYNC system, although functionality will 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 verifying 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.

The USB cable and port are not serviceable separately.

1. DTC U261C (USB #1 Device Error) - sets when the APIM detects an over-current or over-temperature condition in the USB circuit. This can be caused by a fault in the USB cable or 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 voice recognition system is operational with the ignition in RUN and the audio system on. The voice recognition system does not function with the ignition in ACC because the interior rear view mirror only receives voltage in RUN.

The accessory protocol interface module (APIM) sends a reference voltage to the steering wheel controls through circuit VME45 (BU/OG). When the VOICE button is pressed, the APIM recognizes the change in reference voltage and the audio system enters voice recognition mode. A microphone located in the interior rear view mirror receives the voice command and sends a signal to the APIM through circuits VMN13 (YE/GN) and RME13 (BU). The microphone is also used to detect outgoing audio during a phone call.

The voice recognition only functions with the SYNC system; it does not have direct functionality with the audio control module (ACM). As a result, the voice recognition does not control the radio tuner, CD player, or satellite audio system.

1. DTC B1038 (Microphone Input Circuit Failure) - sets during the on-demand self-test if the APIM 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 interior rear view mirror)
5. APIM

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 front display interface module (FDIM) display while driving. The ring tone 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 ring tones, and audio from an outside device during a phone call, are sent from the accessory protocol interface module (APIM) to the audio control module (ACM) through circuits VMN14 (WH/VT) and RMN14 (GY/BN). An open or short to ground in one circuit causes the audible prompt to have poor sound quality.

This pinpoint test is intended to diagnose the following

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

The accessory protocol interface module (APIM) sends left and right channel analog audio signals through circuits VME52 (BU), RME52 (GY/OG), VME53 (VT/GN), and RME53 (BN/WH). These audio signals are sent to the audio control module (ACM).

This pinpoint test is intended to diagnose the following

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