Audio / Video System (Diagnostic Codes & Symptom Tests): Overview Lexus LX J200 рестайлинг

DESCRIPTION

These DTCs are stored when a malfunction occurs in the multi-media module receiver assembly.

The multi-media module receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

This DTC is stored when a microphone connection detection signal line is disconnected.

Scheme 79

This DTC is stored when a malfunction occurs in a connected device.

1. These DTCs are stored when a malfunction occurs in the stereo component amplifier assembly.

This DTC is stored when a malfunction occurs in the multi-display assembly.

This DTC is stored when a malfunction occurs in the multi-display assembly.

This DTC is stored when the hard disc which is built into the multi-media module receiver assembly has an initialization malfunction or read/write errors occur more than a specified number of times.

The multi-media module receiver assembly receives a vehicle speed signal from the combination meter assembly and information from the navigation antenna, and then adjusts the vehicle position on the map. The multi-media module receiver assembly stores this DTC when the difference between the speed information that the navigation antenna assembly receives and the SPD pulse received from the combination meter assembly becomes large.

HINT

1. A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls the respective systems based on the pulse signal.
2. If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the diagram below will not operate normally.

Scheme 80

1. *: w/ Manual (SOS) Switch

Scheme 81

Scheme 82

This DTC is stored when the MOST network cannot be established after the master unit is activated.

HINT

1. If a short occurs in a speaker circuit, the sound from the corresponding speaker will be low or almost impossible to hear. If the volume is turned up in this situation, to prevent excessive current flow due to the short circuit, the stereo component amplifier assembly stops operating when its output exceeds a certain level. When the operation of the stereo component amplifier assembly stops, the audio and visual system will not function normally. This is because MOST communication will stop due to the shut down of the amplifier causing an error in the MOST network. The stereo component amplifier assembly will start operating again when the engine switch is turned off and back on (ACC) again. However, the amplifier will stop operating again if its output exceeds a certain level.
2. When the stereo component amplifier assembly stops operating and a malfunction occurs in the audio and visual system due to a short in a speaker circuit, this DTC will be stored.

1. *: w/ Rear Seat Entertainment System

HINT

1. For the MOST network, the multi-media module receiver assembly is the master unit.
2. Errors may occur in MOST communication between devices due to problems such as electrical noise.

Scheme 83

The multi-media module receiver assembly, multi-display controller sub-assembly* and stereo component amplifier assembly are connected by the MOST network.

When a MOST network error occurs between the multi-media module receiver assembly, multi-display controller sub-assembly and stereo component amplifier assembly, these DTCs will be stored.

1. *: w/ Rear Seat Entertainment System

1. *: w/ Rear Seat Entertainment System

HINT

For the MOST network, the multi-media module receiver assembly is the master unit.

Scheme 84

The multi-display assembly and multi-media module receiver assembly are connected by an AVC-LAN communication line.

When an AVC-LAN communication error occurs between the display module board and multi-display assembly, these DTCs will be stored.

HINT

1. *: Even if no fault is present, this DTC may be stored depending on the battery condition or engine start voltage.
2. The multi-media module receiver assembly is the master unit.

Scheme 85

These DTCs are stored when the temperature is higher or lower than the operation range of the hard disc built into the multi-media module receiver assembly, and hard disk drive read/write errors occur more than a specified number of times.

HINT

The hard disk drive may not operate normally when the temperature is -20°C (-4°F) or lower, or 65°C (149°F) or higher.

This DTC is stored when items controlled by the air conditioning amplifier assembly cannot be customized via the audio and visual system vehicle customization screen.

HINT

The Air conditioning amplifier assembly controls the air conditioning system related items that are customizable via the multi-display assembly screen.

This DTC is stored when items controlled by the main body ECU (cowl side junction block LH) cannot be customized via the audio and visual system vehicle customization screen.

HINT

The main body ECU (cowl side junction block LH) controls the items for the following systems that are customizable via the multi-display assembly screen

1. Power door lock control system
2. Wireless door lock control system
3. Lighting system

This DTC is stored when items controlled by the certification ECU (smart key ECU assembly) cannot be customized via the audio and visual system vehicle customization screen.

HINT

The certification ECU (smart key ECU assembly) controls the smart access system with push-button start (for Entry Function) related items that are customizable via the multi-display assembly screen.

This DTC is stored when items controlled by the position control ECU assembly cannot be customized via the navigation system vehicle customization screen.

HINT

The front power seat switch controls the front power seat control system related items that are customizable via the multi-display screen.

The multi-media module receiver assembly and multi-display assembly are connected by the UART communication line.

When a UART communication error occurs between the multi-media module receiver assembly and multi-display assembly, these DTCs will be stored.

Scheme 86

These DTCs are stored when a malfunction occurs in the satellite radio antenna which is connected to the multi-media module receiver assembly.

These DTCs are stored when a malfunction occurs in the CAN communication circuit.

The multi-media module receiver assembly receives a vehicle speed signal from the combination meter assembly for DVD viewing restriction while driving, parallel parking mode of the parking assist monitor system, etc.

HINT

1. A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls the respective system based on the pulse signal.
2. If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the following diagram will not operate normally.

This circuit sends an operation signal from the steering pad switch assembly to the multi-media module receiver assembly.

If there is an open in the circuit, the audio system cannot be operated using the steering pad switch assembly.

If there is a short in the circuit, the same condition as when a switch is continuously depressed occurs.

Therefore, the multi-media module receiver assembly cannot be operated using the steering pad switch assembly, and also the multi-media module receiver assembly itself cannot function.

Scheme 87

Power is supplied to the multi-media module receiver assembly, multi-display assembly and steering pad switch assembly illumination when the light control switch is in the tail or head position.

Scheme 88

The stereo component amplifier assembly sends a sound signal to the speakers.

The multi-media module receiver assembly sends the sound signal to the stereo component amplifier assembly through this circuit.

The sound signal that has been sent is amplified by the stereo component amplifier assembly, and then is sent to the speakers.

If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly, multi-media module receiver assembly or speakers.

HINT

Refer to w/ Rear Seat Entertainment System. Refer to «DTC B15D0: MOST Communication Malfunction»

Scheme 89

The No. 1 stereo jack adapter assembly sends the sound signal from an external device to the multi-media module receiver assembly through this circuit.

The sound signal that has been sent is amplified by the stereo component amplifier assembly or multi-media module receiver assembly, and then is sent to the speakers.

If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly, multi-media module receiver assembly or speakers.

Scheme 90

The No. 1 stereo jack adapter assembly sends the sound data signal or image data signal from a USB device to the multi-media module receiver assembly via this circuit.

Scheme 91

The DCM (telematics transceiver) sends a mute signal to the stereo component amplifier assembly.

The stereo component amplifier assembly controls the volume according to the mute signal from the DCM (telematics transceiver).

Scheme 92

Scheme 93

Scheme 94

1. CHECK DCM (TELEMATICS TRANSCEIVER) Measure the voltage according to the value(s) in the table below. STANDARD VOLTAGE Tester Connection Condition Specified Condition P6-17 (MUTE) - Body ground Engine switch on (ACC), audio system is playing --> Emergency call mode 3.5 V or higher --> Below 1 V TEXT IN ILLUSTRATION *a Component with harness connected (DCM [Telematics Transceiver]) NG --> See step 2 OK --> See step 4
2. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - DCM [TELEMATICS TRANSCEIVER]) Disconnect the F60 stereo component amplifier assembly connector. Disconnect the P6 DCM (telematics transceiver) connector. Measure the resistance according to the value(s) in the table below. STANDARD RESISTANCE Tester Connection Condition Specified Condition F60-2 (TMUT) - P6-17 (MUTE) Always Below 1 ohms F60-2 (TMUT) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY Reconnect the stereo component amplifier assembly connector. Measure the voltage according to the value(s) in the table below. STANDARD VOLTAGE Tester Connection Switch Condition Specified Condition P6-17 (MUTE) - Body ground Engine switch on (ACC) 3.5 V or higher TEXT IN ILLUSTRATION *a Front view of wire harness connector (to DCM [Telematics Transceiver]) NG --> See step 5 OK --> See step 6
4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [01/2012 - ]»
5. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to «REMOVAL [01/2012 - ]»
6. REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to «REMOVAL [01/2012 - ]»

Each audio system component connected to the AVC-LAN (communication bus) transfers switch signals using the audio visual communication local area network.

If a short to +B or short to ground occurs in the AVC-LAN, the audio system will not function normally because communication is not possible.

Scheme 95

The circuit is necessary for the Automatic Sound Levelizer (ASL) built into the stereo component amplifier assembly.

Speed signals are received from the combination meter assembly and used for the ASL.

The ASL function automatically adjusts the sound volume in order to clear audio quality even when vehicle noise increases (as vehicle noise increases, the volume is turned up etc.).

HINT

1. A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls the respective system based on the pulse signal.
2. If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the diagram below will not operate normally.

Scheme 96

Scheme 97

1. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - COMBINATION METER ASSEMBLY) Disconnect the F60 stereo component amplifier assembly connector and E77 combination meter assembly connector. Measure the resistance according to the value(s) in the table below. STANDARD RESISTANCE Tester Connection Condition Specified Condition F60-17 (SPD) - E77-4 (+S) Always Below 1 ohms F60-17 (SPD) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) Reconnect the E77 combination meter assembly connector. Check the input waveform. Connect an oscilloscope to terminal F60-17 (SPD) and body ground. Turn the engine switch on (IG). Turn a wheel slowly. TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Stereo Component Amplifier Assembly) Check the signal waveform according to the condition(s) in the table below. Item Condition Measurement terminal F60-17 (SPD) - Body ground Tool setting 5 V/DIV., 20 ms./DIV. Vehicle condition Driving at approx. 20 km/h (12 mph) OK The waveform is displayed as shown in the illustration. HINT: When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows. NG --> See step 4 OK --> See step 3
3. REPLACE PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [01/2012 - ]»
4. GO TO METER / GAUGE SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [01/2012 - ]»

The display image signal from the multi-media module receiver assembly is sent to the multi-display assembly using a digital communication cable.

Scheme 98

1. The multi-media module receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.
2. Using this circuit, the multi-media module receiver assembly sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the multi-media module receiver assembly (w/o Manual [SOS] Switch).
3. Using this circuit, the DCM (telematics transceiver) sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the multi-media module receiver assembly via the DCM (telematics transceiver) (w/ Manual [SOS] Switch).

The multi-media module receiver assembly sends a visual mute signal to the multi-display assembly. As a result, a black screen is inserted when the screen changes so that noise and distorted images are not displayed.

When an open exists in the circuit, noise and distorted images will be displayed instead of a black screen.

When a short exists in the circuit, even though the multi-display assembly is operating normally, noise and distorted images will be displayed (black screen will not be displayed) during screen changes or the black screen will always be displayed.

Scheme 99

This circuit provides power to the multi-media module receiver assembly.

Scheme 100

This circuit provides power to the stereo component amplifier assembly.

Scheme 101

This circuit provides power to the multi-display assembly.

Scheme 102

See also:
• REMOVAL [01/2012 - ]