Component Description
| Part name | Description |
|---|---|
| AV control unit | It is the master unit of the MULTI AV system, and it is connected to each control unit by communication. It operates each system according to communication signals from the AV control unit. The AV control unit includes the audio, USB connection and vehicle information functions. It is connected to ECM and unified meter and A/C amp. via CAN communication to obtain necessary information for the vehicle information function. It is connected to the steering angle sensor and receives the steering angle sensor signal via CAN communication. It inputs the illumination signals that are required for the display dimming control. It inputs the signals for driving status recognition (vehicle speed, reverse and parking brake). TEL voice signal and voice guidance signal are input from TEL adapter unit. |
| Door speaker | Outputs sound signal from AV control unit. Outputs high, mid and low range sounds. |
| Rear speaker | Outputs sound signal from AV control unit. Outputs high, mid and low range sounds. |
| Tweeter | Outputs sound signal from AV control unit. Outputs high range sound. |
| Display unit | Display image is controlled by the serial communication from AV control unit. It receives the power (signal VCC and inverter VCC) from the AV control unit and operates. RGB image signal is input from AV control unit (RGB image, RGB area and RGB synchronizing). Composite image signals are input from AV control unit. Synchronizing signal (HP, VP) is output to AV control unit. |
| Multifunction switch | Operation panel is equipped with the centralized switch where audio operations are integrated. Connected with preset switch via cable, and operation signal is transmitted to AV control unit via AV communication. |
| Preset switch | Operation panel is equipped with the centralized switch where audio and air conditioner, etc. operations are integrated. Connected with multifunction switch via cable, and operation signal is transmitted to AV control unit via AV communication. The disk ejection operating signal is performed by hardwire. |
| Rear view camera | Camera power supply is input from AV control unit. The image of vehicle rear view is transmitted to AV control unit. |
| Steering angle sensor | It is connected to the AV control unit and transmits the steering angle sensor signal via CAN communication. |
| Steering switch | Operations for audio, hands-free phone and voice control, etc. are possible. Steering switch signal (operation signal) is output to AV control unit. |
| Microphone | Used for hands-free phone operation and voice recognition. Microphone signal is transmitted to TEL adapter unit. Power (Microphone VCC) is supplied from TEL adapter unit. |
| Antenna base | An antenna base integrated with radio antenna amp. and satellite radio antenna is adopted. ANTENNA AMP. Radio signal received by rod antenna is amplified and transmitted to AV control unit. Power (antenna amp. ON signal) is supplied from AV control unit. SATELLITE RADIO ANTENNA Receives the satellite radio waves and outputs it to AV control unit. |
| Satellite radio tuner | Inputs the satellite radio signal from satellite radio antenna and outputs the sound signal to the AV control unit. It is controlled with the AV control unit and serial communication (communication signal and request signal). |
| TEL adapter unit | Inputs the TEL voice signal from TEL antenna and outputs it to the AV control unit. It is connected with the AV control unit via AV communication and controlled with the AV control unit. Inputs roof status signal from retractable hard top control unit. |
| TEL antenna | Receives the TEL voice signal and outputs it to the TEL adapter unit. |
| USB connector | Image signal (1) and sound signal of USB input is transmitted to AV control unit. |
| (1) Image signals cannot be received from iPod®. | |
| (1) | Image signals cannot be received from iPod®. |
Scheme 94
Note. The name MULTIFUNCTION SWITCH indicates the integration of PRESET SWITCH and MULTIFUNCTION SWITCH virtually. An antenna base integrated with radio antenna and satellite radio antenna is adopted.
Scheme 95
MULTI AV SYSTEM: System Description
Multi AV system means that the following systems are integrated.
| FUNCTION NAME |
|---|
| Audio function |
| Hands-free phone function |
| Rear view monitor function |
| Vehicle information function |
COMMUNICATION SIGNAL
- AV control unit function by transmitting/receiving data one by one with each unit (slave unit) that configures them completely as a master unit by connecting between units that configure MULTI AV system with two AV communication lines (H, L).
- Two AV communication lines (H, L) adopt a twisted pair line that is resistant to noise.
- AV control unit is connected by CAN communication, and it receives data signal from ECM, unified meter and A/C amp. It computes and displays fuel economy information value with the obtained information.
- AV control unit is connected with display and serial communication, and it transmits the required signal of display and display control and receives the response signal from display.
Description
- The AV control unit diagnosis function starts up with multifunction switch operation and the AV control unit performs a diagnosis for each unit in the system during the on board diagnosis.
- Perform a CONSULT diagnosis if the on board diagnosis does not start, e.g., the screen does not display anything, the multifunction switch does not function, etc.
- The trouble diagnosis function has a self-diagnosis mode for conducting trouble diagnosis automatically and a confirmation/adjustment mode for operating manually.
- Self-diagnosis mode performs the AV control unit diagnosis and the connection diagnosis between each of the units that make up the system, and it indicates the results to the display unit.
- The confirmation/adjustment mode allows the technician to check, modify or adjust the vehicle signals and set values, as well as to monitor the system error records and system communication status. The checking, modifying or adjusting generally require human intervention and judgment (the system cannot make judgment automatically).
ECU IDENTIFICATION
The part number of AV control unit is displayed.
- Since vehicle specifications are not included in the AV control unit after replacement, it is required to write vehicle specifications with CONSULT.
- Configuration has three functions as follows.
| Function | Description | |
|---|---|---|
| Read/Write Configuration | Before Replace ECU | Allows the reading of vehicle specification written in AV control unit to store the specification in CONSULT. |
| After Replace ECU | Allows the writing of the vehicle information stored in CONSULT into the AV control unit. | |
| Manual Configuration | Allows the writing of the vehicle specification into the AV control unit by hand. | |
CAN (Controller Area Network) is a serial communication line for real-time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independently). In CAN communication, control units are connected with 2 communication lines (CAN-H, CAN-L) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. CAN Communication Signal Chart. Refer to " CAN COMMUNICATION SIGNAL CHART ".
U1300 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simultaneously, without fail, with the malfunction of control units connected to AV control unit with communication line. Determine the possible malfunction cause from the table below.
Transmit the image displayed with AV control unit with RGB signal to the display unit.
Transmit the image displayed with AV control unit with RGB signal to the display unit.
Transmit the image displayed with AV control unit with RGB signal to the display unit.
Transmit the RGB synchronizing signal to the display unit so as to synchronize the RGB image displayed with AV control unit.
Transmits the display area of RGB image displayed by AV control unit with RGB area (YS) signal to display unit.
- AV control unit outputs camera power supply to rear view camera and inputs rear view camera image signal from rear view camera when the reverse signal is input.
- The AV control unit that inputs the camera image signal transmits the camera image signal to the display unit.
AV control unit that inputs the camera image signal transmits the composite image signal to the display unit.
In composite image (camera image), transmit the vertical synchronizing (VP) signal and horizontal synchronizing (HP) signal from display unit to AV control unit so as to synchronize the RGB images displayed with AV control unit such as the image quality adjusting menu, etc.
In composite image (camera image), transmit the vertical synchronizing (VP) signal and horizontal synchronizing (HP) signal from display unit to AV control unit so as to synchronize the RGB images displayed with AV control unit such as the image quality adjusting menu, etc.
The eject signal is output to AV control unit when the eject switch of multifunction switch is pressed.
Supply power from TEL adapter unit to microphone. The microphone transmits the sound/voice to the microphone.
TEL adapter unit identifies the vehicle model according to the control signal and performs the control.
Transmits the steering switch signal to AV control unit.
Transmits the steering switch signal to AV control unit.
Transmits the steering switch signal to AV control unit.
OPERATION
| Symptoms | Check items | Possible malfunction location/Action to take |
|---|---|---|
| Multifunction switch and preset switch operation does not work. | All switches cannot be operated. "MULTI AV" is displayed on system selection screen when the CONSULT is started. | Multifunction switch power supply and ground circuit. AV communication circuit between AV control unit and multifunction switch. Perform "Self diagnosis Result" of "MULTI AV" with CONSULT. Refer to " CONSULT FUNCTION ". |
| All switches cannot be operated. "MULTI AV" is not displayed on system selection screen when the CONSULT is initialized. | AV control unit power supply and ground circuit malfunction. Refer to " AV CONTROL UNIT: DIAGNOSIS PROCEDURE ". | |
| Only specified switch cannot be operated. | Multifunction switch or preset switch malfunction. Perform multifunction switch and preset switch self-diagnosis function. Refer to " ON BOARD DIAGNOSIS FUNCTION ". | |
| Fuel economy display, vehicle setting operation is abnormal. | There is malfunction in the CONSULT self-diagnosis result. Refer to " CONSULT FUNCTION ". | Perform detected DTC diagnosis. Refer to " DTC INDEX ". |
| There is no malfunction in the self-diagnosis results. Refer to " CONSULT FUNCTION ". | Ignition signal circuit malfunction. (AV control unit) |
BASIC OPERATIONS
| Symptom | Possible cause | Possible solution |
|---|---|---|
| No image is displayed. | The brightness is at the lowest setting. | Adjust the brightness of the display. |
| The systems in the video mode. | Press "DISC-AUX" to change the mode. | |
| The display is turned off. | Press " / OFF" to turn on the display. | |
| The screen is too dim. The movement is slow. | The temperature in the interior of the vehicle is low. | Wait until the interior of the vehicle has warmed up. |
| Some pixels in the display are darker or brighter than others. | This condition is an inherent characteristic of liquid crystal displays. | This is not a malfunction. |
| Some menu items cannot be selected. | Some menu items become unavailable while the vehicle is driven. | Park the vehicle in a safe location, and then operate the multi AV system. |