Audio System - Diagnostics: Other Toyota Sequoia I рестайлинг

PRECAUTION

Note. When disconnect the battery terminal, initialize the following systems after the terminal is reconnected.

SYSTEM NAME CHART

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1. COMPACT DISC PLAYER Compact Disc (hereafter called "CD") Players use a laser beam pick-up to read the digital signals recorded on the CD and reproduce analog signals of the music, etc. 4.7 in. (12 cm) and 3.2 in. (8 cm) discs are available for the CD player. HINT: Never disassemble or apply oil to any part of the player unit. Do not insert any object other than a disc, into the CD player. NOTE: CD players use an invisible laser beam which could cause hazardous radiation exposure. Be sure to operate the player correctly as instructed.
2. MAINTENANCE Tape Player/Head Cleaning: Raise the cassette door with your finger. Using a pencil or similar object, push in the guide. Using a cleaning pen or cotton applicator soaked in cleaner, clean the head surface, pinch rollers and capstans.
3. MAINTENANCE CD Player/Disc Cleaning: If the disc gets dirty, clean the disc by wiping the surface from the center to outside in a radial directions with a soft cloth. NOTE: Do not use a conventional record cleaner or anti-static preservative.
4. OUTLINE OF AVC-LAN What is AVC-LAN? AVC-LAN is the abbreviation for Audio Visual Communication-Local Area Network. This is a unified standard co-developed by 6 audio manufacturers associated with Toyota Motor Corporation. The unified standard includes signals, such as audio, visual and signals for switch indication and communication. Objectives Recently development in car audio systems has been rapid and functions have been changed drastically. The conventional system has been switched to a multi-media type such as a navigation system. At the same time customers wants to upgrade their audio systems. This is the factor that lies behind this standardization. The concrete objectives are explained below. When products by different manufacturers were combined together, malfunctions such as sound failure occurred. This problem can be solved by standardization of signals. Various types of after market products are available. In general, a new product developed by a particular manufacturer could not be used due to a lack of compatibility with other manufacturer's products. By developing this new standard, users can enjoy a range of compatible products from different manufacturers. HINT: When +B short or GND short is detected in the AVC-LAN circuit, communication stops, and the audio system will not function. When the audio system is not equipped with a navigation system, the audio head unit is the master unit. When the audio system is equipped with a navigation system, the multi-display is the master unit. The radio receiver assy is equipped with a resistor (60 to 80 ohm) for communication. All car audio systems using an AVC-LAN circuit have a diagnostic function. Each unit has its own specified number called a physical address (three-digit number). Numbers are also allotted to each function, which are called logical addresses (two-digit number).
5. COMMUNICATION SYSTEM Components in the audio system communicate with each other through the AVC-LAN. (Radio receiver with CD changer control function) When a short circuit or circuit breakdown occurs in the AVC-LAN circuit, the audio system does not operate normally due to the communication cutoff.
6. DIAGNOSTIC FUNCTION The audio system has diagnostic function (The diagnostic result is displayed on the LCD of the radio receiver assy). (Radio receiver with CD changer control function) The component code (physical address), or three-digit number (in hexadecimal) is set for each component comprising AVC-LAN. The logical address, or two-digit number (in hexadecimal) is set for each function and component unit in each component.

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1. RADIO WAVE BAND The radio wave bands used in radio broadcasting are as follows
2. SERVICE AREA There is a great difference in the size of the service areas for AM and FM broadcasting. Sometimes an FM stereo broadcast cannot be received even though AM can be received very clearly. FM stereo has the smaller service area, it also picks up static and other types of interference ("noise") easily.
3. RECEPTION PROBLEMS HINT: Besides the problem of static, there are other problems, such as "phasing", "multipath" and "fade out". These problems are caused not by electrical noise but by the nature of the radio waves themselves. Phasing Besides electrical interference, AM broadcasts are also susceptible to other types of interference, especially at night. This is because AM radio waves bounce off the ionosphere at night. These radio waves then interfere with the signals that reach the vehicle's antenna directly from the same transmitter. This type of interference is called "phasing". Multipath Interference caused by reflection of radio waves against obstructions is called "Multipath". Multipath occurs when radio signals emitted from the broadcast transmitter antenna are reflected against tall buildings or mountains and interferes with other signals which are to be received directly. Fade Out FM radio wave tends to be reflected against obstructions such as tall buildings or mountains because FM frequency is higher than AM. For this reason, FM signals often seem to gradually disappear or fade away as the vehicle goes behind those obstructions. This phenomenon is called "fade out".
4. NOISE PROBLEMS It is very important for technicians to clearly understand a customer's claim about noise. Use the following table to diagnose the phenomena. HINT: If the condition when the noise occurs does not meet any of the above, find out the cause based on "Reception Problems". Refer to the description about Multipath and Phasing mentioned previously.
5. Identify the condition in which the noise occurs, and check the noise filter on the related part. CONDITION CHART Condition in which noise occurs Noise Source Depressing the acceleration pedal increases the noise, and stopping the engine stops the noise immediately. Generator Noise occurs during A/C or the heater operation. Blower motor Rapid acceleration while driving on an unpaved road or after the ignition switch is turned on makes noise. Fuel pump Pressing and then releasing the horn switch, and keeping pressing the horn switch makes unusual noise. Horn Quiet noise is heard while the engine is running, but stops with the engine. Ignition Noise occurs synchronously with the turn signal flash. Flasher Noise occurs during window washer operation. Washer Noise occurs while the engine is running, and it continues even after the engine stops. Engine coolant temperature sensor Noise occurs during wiper operation. Wiper Noise occurs when the brake pedal is depressed. Stop light switch Others. Static electricity stored on the vehicle Reference: Make sure first that there is no noise from outside. Failing to do so makes the noise source detection difficult and leads to misdiagnosis. The noise should be removed in descending order of loudness. Tuning the radio so that no station is received wakes the noise more noticeable, making the recognition of the phenomenon easier.

RADIO RECEIVER ASSY

HINT

Inspect the "Fuse" and "Relay" before confirming the suspected area as shown in the charts below.

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1. RADIO RECEIVER ASSY (SEPARATE TYPE AMPLIFIER) *1: w/ Rear seat entertainment system *2: w/ Rear seat audio system
2. RADIO RECEIVER ASSY (BUILT-IN TYPE AMPLIFIER)
3. STEREO COMPONENT AMPLIFIER ASSY TERMINAL CONDITION SPECIFICATION CHART Symbols (Terminal No.) Wiring Color Terminal Description Condition Specification B+ (S9-1) - E (S9-16) L-W - BR Battery Always 10 to 14 V RL+ (S9-4) - E (S9-16) B - BR Sound signal (Rear Left) Audio system is playing A waveform synchronized with sounds is output RR+ (S9-5) - E (S9-16) R - BR Sound signal (Rear Right) Audio system is playing A waveform synchronized with sounds is output FL+ (S9-2) - E (S9-16) P - BR Sound signal (Front Left) Audio system is playing A waveform synchronized with sounds is output FR+ (S9-3) - E (S9-16) LG - BR Sound signal (Front Right) Audio system is playing A waveform synchronized with sounds is output WFL+ (S9-6) - E (S9-16) L-W - BR Sound signal (Front Left) Audio system is playing A waveform synchronized with sounds is output WFR+ (S9-7) - E (S9-16) R - BR Sound signal (Front Right) Audio system is playing A waveform synchronized with sounds is output B2+ (S9-10) - E (S9-16) L-W - BR Battery Always 10 to 14 V RL- (S9-13) - E (S9-16) Y - BR Sound signal (Rear Left) Audio system is playing A waveform synchronized with sounds is output RR- (S9-14) - E (S9-16) W - BR Sound signal (Rear Right) Audio system is playing A waveform synchronized with sounds is output GND (S9-15) - Body ground BR - Body ground Ground Always Below 1 V E (S9-16) - Body ground BR - Body ground Ground Always Below 1 V FL- (S9-11) - E (S9-16) V - BR Sound signal (Front Left) Audio system is playing A waveform synchronized with sounds is output FR- (S9-12) - E (S9-16) L - BR Sound signal (Front Right) Audio system is playing A waveform synchronized with sounds is output WFL- (S9-17) - E (S9-16) G - BR Sound signal (Front Left) Audio system is playing A waveform synchronized with sounds is output WFR- (S9-18) - E (S9-16) Y - BR Sound signal (Front Right) Audio system is playing A waveform synchronized with sounds is output MUTE (S10-1) - E (S9-16) R-W - BR Mute signal from radio receiver Audio system is sounding --> changing mode Above 3.5 V -> Below 1 V L- (S10-2) - E (S9-16) R - BR Sound signal from radio receiver (Left) Audio system is playing A waveform synchronized with sounds is output L+ (S10-3) - E (S9-16) B - BR Sound signal from radio receiver (Left) Audio system is playing A waveform synchronized with sounds is output R- (S10-4) - E (S9-16) G - BR Sound signal from radio receiver (Right) Audio system is playing A waveform synchronized with sounds is output R+ (S10-5) - E (S9-16) W - BR Sound signal from radio receiver (Right) Audio system is playing A waveform synchronized with sounds is output SGND (S10-6) - Body ground Shielded - Body ground Ground Always Below 1 V ACC (S10-12) - E (S9-16) GR - BR Accessory (ON) Turn ignition switch OFF -> ACC Below 1 V --> 10 to 14 V TX- (S10-19) - E (S9-16) P - BR AVC-LAN communication signal Turn ignition switch to ACC 2 to 3 V TX+ (S10-20) - E (S9-16) V - BR AVC-LAN communication signal Turn ignition switch to ACC 2 to 3 V
4. MULTI-DISPLAY CONTROLLER ASSY See «TERMINALS OF ECU»(ref-227580-S29566921682006040600000)
5. REAR SEAT AUDIO CONTROLLER See «TERMINALS OF ECU»(ref-227579-S27890955052006040600000)

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1. DIAGNOSTIC CHECK Starting Diagnostic Mode (All elements come on during the SW check mode). Turn off the audio system and turn the ignition switch to the ACC position. While pressing the preset switches "1" and "6" at the same time, press the "DISC" 3 times. Reference: When the system enters the Diagnosis Mode, a beep sound is emitted 3 times and all the elements come on during the SW check mode. It takes about 40 seconds to complete the check. Turn all the elements in the LCD on. When pressing the switch, confirm beep sound is emitted. Service Check Screen. Press the "SEEK TRACK" switch to enter the "Service Check Screen". In the service check mode, the system check and the diagnostic memory check are performed, and the check results are displayed in ascending order of the component codes (physical address.) TERMS MEANING Terms Meaning Component code (Physical address) Three-digit code (In hexadecimal) given to each device comprising AVC-LAN. Component code (Physical address) Corresponding to its function, individual symbol is provided. Logical address Two-digit code (In hexadecimal) given to each function and device unit in each device comprising AVC-LAN. Code No. (physical address) List EQUIPMENT NAME CHART Code No. (physical address) Equipment name 190 Radio receiver assy (Audio head unit) 440 Stereo component amplifier assy 1F6 Multi-display controller (RSE ECU) 1F4 Rear seat audio controller Finishing Diagnostic Mode. Press the "DISC" for 2 seconds or more, or turn the ignition switch off. Service Check Mode Result Display (for checking the current and the past system conditions). Press the "SEEK TRACK" switch to see the check result of each component. Check Result Display. DISPLAY MEANING CHART Display Original Language Meaning Action to be taken Good Good (normal) No DTCs are detected in both "System Check Mode" and "Diagnostic Memory Mode". - NCON No connection The system recognized the component when it was registered, but the component gives no response to the "Diagnostic Mode ON Request". Check the power source circuit and the communication circuit of the component indicated by the component code (physical address). ECHN Exchange One or more DTCs for "Exchange" are detected in either "System Check Mode" or "Diagnostic Memory Mode". Go to the detailed information mode to check the trouble area referring to the DTC list. CHEC Check When no DTCs are detected for "Exchange", one or more DTCs for "Check" are detected in either "System Check Mode" or "Diagnostic Memory Mode". Go to the detailed information mode to check the trouble area referring to the DTC list. OLD Old version Old DTC application is identified and DTC is detected in either "System Check Mode" or "Diagnostic Memory Mode". - NRES No response The device gives no response to any one of "System Check Mode ON Request", "System Check Result Request" and "Diagnostic Memory Request". Check the power source circuit and the communication circuit of the component indicated by the component code (physical address). To perform the Service Check again, press the preset switch "1". Detailed Information Mode (when displaying the DTC for a trouble component) With "CHEC" or "ECHN" being displayed, press the preset switch "2" to go to the detailed information mode. Press the "SEEK TRACK" switch to display the "System Check Result (SYS)" and "Diagnostic Memory Response (CODE)". Displayed Items in Detailed Information Mode Check the trouble area referring to the DTC list. To return to the service check mode, press the preset switch "3".
2. DTC CLEAR Clearing Individual DTC Memory (when clearing the memory of the DTC detected in the past individually) Press the preset switch "5" for 2 seconds or more while the "ECHN" is displayed in the service check mode or during the detailed information mode. HINT: Beep sound is emitted once when the DTC memory is completely cleared. When the DTC memory is cleared, only the component code (physical address) is displayed for the target component. To check DTCs, press the preset switch "1" and perform the service check again. Clearance of all the DTC memory (when clearing all the memory of the DTCs detected in the past) Start the diagnostic mode after repairing the trouble area. Press the preset switch "5" for 2 seconds or more ("CLR" is displayed at this time). HINT: Beep sound is emitted once when the DTC memory is completely cleared. When the DTC memory for all the component is cleared, only the component codes (physical address) are displayed. Press the preset switch "1" to perform the service check again, and check that no DTCs are displayed for all the component codes (physical address). Finishing Diagnostic Mode. Press the "DISC" for 2 seconds or more, or turn the ignition switch off.

CD Sound Skips

HINT

1. The sound may skid when driving on an unpaved road.
2. Sudden temperature changes in the cabin will cause condensation inside the CD player and prevent it from playing.

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1. Disc cleaning. PREPARATION: Disc cleaning If the disc gets dirty, clean the disc by wiping the surface from the center to outside in a radial direction a with a soft cloth. NOTE: Do not use a conventional record cleaner or anti-static preservative. OK: Malfunction disappears. OK: End. NG: Go to next step.
2. Replace CD with another and recheck. CHECK: Replace the CD with another and recheck. Replace the CD with another normal one to see if the same trouble occurs again. OK: Malfunction disappears. OK: End. NG: Go to next step.
3. Check of radio receiver assembly installation. CHECK: Check that the radio receiver assembly is installed properly. OK: Installed properly. NG: Install the radio receiver assembly properly. OK: Go to next step.
4. Did temperature in cabin change rapidly? CHECK: Check whether or not rapid temperature change occurred in the cabin. OK: A rapid temperature change occurred. HINT: A rapid temperature change creates condensation inside the CD player, which may prevent the CD from being played. NG: Replace radio receiver assy. OK: Let it sit for a while before using (Condensation due to temperature change).