Scheme 390
Component Description
| Part name | Description |
|---|---|
| AV control unit | Controls audio system functions |
| Display unit | Displays audio and climate control related information |
| A/C and AV switch assembly | All audio and A/C operations can be operated switch signal is output to the AV control unit and A/C auto amp |
| Steering wheel audio control switches | Audio operation can be operated Steering switch signal (operation signal) is output to AV control unit |
| Front door speakers | Outputs audio signal from AV control unit Outputs high, mid and low range sounds |
| Front tweeters | Outputs audio signal from AV control unit Outputs high range sounds |
| Rear door speakers | Outputs audio signal from AV control unit Outputs high, mid and low range sounds |
| Antenna amp. | Radio signal received by window antenna is amplified and sent to AV control unit Power (antenna amp. ON signal) is supplied from AV control unit |
Scheme 391
System Description
When the shift selector is in the R position, the AV control unit receives camera image signals from the rear view camera and sends the camera image signals to the display unit which shows a view to the rear of the vehicle. Lines which indicate the vehicle clearance and distances are also displayed.
Scheme 392
| Part name | Description |
|---|---|
| AV control unit | Receives reverse signal from back-up lamp relay Sends camera ON signal to rear view camera Receives image signal from rear view camera Sends camera image signal to display unit |
| Rear view camera | Receives camera ON signal from AV control unit Sends image signal to the AV control unit |
| Display unit | Receives camera image signal from AV control unit |
DESCRIPTION
- Diagnosis function consists of the "Self-Diagnosis" mode performed automatically and the "Confirmation/Adjustment" mode operated manually.
- "Self-Diagnosis" mode checks for connections between the units constituting this system, analyzes each individual unit at the same time, and displays the results on the LCD screen.
- "Confirmation/Adjustment" mode is used to perform trouble diagnosis that requires operation and judgment by an operator (trouble that cannot be automatically judged by the system), to check/change the set value, and to display the error history of the AV control unit.
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 independent). 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 ".
Initial diagnosis of AV control unit.
Replace the AV control unit if this DTC is displayed. Refer to " REMOVAL AND INSTALLATION ".
| 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 means of communication. It operates each system according to communication signals from the AV control unit. AV control unit includes audio function and vehicle information function. It is connected to ECM and combination meter via CAN communication to obtain necessary information for the vehicle information function. It inputs the automatic brightness ON/OFF signals that are required for the display dimming control. It inputs the signals for driving status recognition (vehicle speed, reverse and parking brake). |
Replace the AV control unit if this DTC is displayed. Refer to " REMOVAL AND INSTALLATION ".
| 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 means of communication. It operates each system according to communication signals from the AV control unit. AV control unit includes audio function and vehicle information function. It is connected to ECM and combination meter via CAN communication to obtain necessary information for the vehicle information function. It inputs the automatic brightness ON/OFF signals that are required for the display dimming control. It inputs the signals for driving status recognition (vehicle speed, reverse and parking brake). |
U1240 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.
Self-diagnosis results display item
| DTC | Display contents of CONSULT | DTC Detection Condition | Possible causes |
|---|---|---|---|
| U1240 | SWITCH CONN [U1240] | A/C and AV switch assembly power supply and ground circuit malfunction is detected A malfunction is detected in communication circuit between AV control unit and A/C and AV switch assembly A malfunction is detected in communication signal between AV control unit and A/C and AV switch assembly | A/C and AV switch assembly power supply and ground circuits Communication circuit between AV control unit and A/C and AV switch assembly |
| Part name | Description |
|---|---|
| DISPLAY UNIT | Display image is controlled by the serial communication from AV control unit. Inputs the RGB image signal (RGB, RGB area and RGB synchronizing) from AV control unit and the auxiliary image signal from the auxiliary input jacks. Outputs the synchronizing signals (HP and VP) to the AV control unit. |
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.
Self-diagnosis results display item
| DTC | Display contents of CONSULT | DTC Detection Condition | Possible causes |
|---|---|---|---|
| U1300 U1240 | AV COMM CIRCUIT [U1300] SWITCH CONN [U1240] | A/C and AV switch assembly power supply and ground circuit malfunction is detected A malfunction is detected in communication circuit between AV control unit and A/C and AV switch assembly A malfunction is detected in communication signal between AV control unit and A/C and AV switch assembly | A/C and AV switch assembly power supply and ground circuits Communication circuit between AV control unit and A/C and AV switch assembly |
Replace the AV control unit if this DTC is displayed. Refer to " REMOVAL AND INSTALLATION ".
| 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 means of communication. It operates each system according to communication signals from the AV control unit. AV control unit includes audio function and vehicle information function. It is connected to ECM and combination meter via CAN communication to obtain necessary information for the vehicle information function. It inputs the automatic brightness ON/OFF signals that are required for the display dimming control. It inputs the signals for driving status recognition (vehicle speed, reverse and parking brake). |
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.
In composite image (AUX 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 (AUX 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 AV control unit sends audio signals to the front door speakers using the front door speaker circuits.
The AV control unit sends audio signals to the front tweeters using the front tweeter circuits.
The AV control unit sends audio signals to the rear speakers using the rear speaker circuits.
When one of the steering wheel AV control switches is pushed, the resistance in the steering wheel AV control switch circuit changes depending on which button is pushed.
Rear view camera signals are transmitted from the rear view camera to the AV control unit using the camera signal circuits.
The majority of the audio concerns are the result of outside causes (bad CD, electromagnetic interference, etc.).
NOISE
The following noise results from variations in field strength, such as fading noise and multi-path noise, or external noise from trains and other sources. It is not a malfunction.
- Fading noise: This noise occurs because of variations in the field strength in a narrow range due to mountains or buildings blocking the signal.
- Multi-path noise: This noise results from the waves sent directly from the broadcast station arriving at the antenna at a different time from the waves which reflect off mountains or buildings.
The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunctioning. Check if noise is caused and/or changed by engine speed, ignition switch turned to each position, and operation of each piece of electrical equipment, and determine the cause.
Note. The source of the noise can be found easily by listening to the noise while removing the fuses of electrical components, one by one.
Type of Noise and Possible Cause
| Occurrence condition | Possible cause | |
|---|---|---|
| Occurs only when engine is ON. | A continuous growling noise occurs. The speed of the noise varies with changes in the engine speed. | Ignition components |
| The occurrence of the noise is linked with the operation of the fuel pump. | Fuel pump condenser | |
| Noise only occurs when various electrical components are operating. | A cracking or snapping sound occurs with the operation of various switches. | Relay malfunction, audio unit malfunction |
| The noise occurs when various motors are operating. | Motor case ground Motor | |
| The noise occurs constantly, not just under certain conditions. | Rear defogger coil malfunction Open circuit in printed heater Poor ground of antenna feeder line | |
| A cracking or snapping sound occurs while the vehicle is being driven, especially when it is vibrating excessively. | Ground wire of body parts Ground due to improper part installation Wiring connections or a short circuit | |
OPERATION PROCEDURE
- Connect both battery cables. NOTE: Supply power using jumper cables if battery is discharged.
- Use the Intelligent Key or mechanical key to turn the ignition switch to the "ACC" position. At this time, the steering lock will be released.
- Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
- Perform the necessary repair operation.
- When the repair work is completed, return the ignition switch to the "LOCK" position before connecting the battery cables. (At this time, the steering lock mechanism will engage.)
- Perform a self-diagnosis check of all control units using CONSULT.