DESCRIPTION
When the navigation system is activated with the light control switch in the tail or head position, before AVC-LAN communication is established, the multi-display assembly dims the display according to the illumination signal received via a direct line.
After AVC-LAN communication is established, the multi-display assembly dims the display according to a dimmer signal sent via AVC-LAN communication.
The multi-media module receiver assembly switches between the daytime screen and night screen on the multi-display according to the illumination signal input.
Scheme 48
When a USB device or "iPod" is connected to the USB jack of the No. 1 stereo jack adapter assembly, it must have playable files. The device must also communicate with and be recognized by the multi-media module receiver assembly. This diagnosis procedure is for when a device is not recognized, or files from the device cannot be played normally.
Scheme 49
When the remote touch switch knob is operated, the built-in 2-axis motors are controlled. The motors are used to provide feedback force for the knob according to the pointer operation displayed on the multi-display.
When the remote touch switch knob is operated, the built-in 2-axis motors are controlled. The motors are used to provide feedback force for the knob according to the pointer operation displayed on the multi-display.
Power is supplied to the remote touch illumination when the light control switch is in the tail or head position.
HINT
Only the "MAP/VOICE" and "MENU" switches on the remote touch illuminate.
Scheme 50
Power is supplied to the remote touch illumination when the light control switch is in the tail or head position.
HINT
- When the remote touch is in self check mode, the switch illumination on the remote touch may remain on.
- If any illumination controlled by the rheostat switch has a malfunction such as an open circuit, the switch illumination of the remote touch is affected and cannot be controlled by the rheostat switch.
Scheme 51
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 to 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 52
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 to 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.
Power is supplied to the multi-media module receiver assembly and steering pad switch assembly illumination when the light control switch is in the tail or head position.
Scheme 53
Power is supplied to the multi-media module receiver assembly and steering pad switch assembly illumination when the light control switch is in the tail or head position.
This circuit is from the parking brake switch assembly to the multi-media module receiver assembly.
Scheme 54
If there is a short in a speaker circuit, the stereo component amplifier assembly detects the short and stops output to the speakers.
Thus sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly or speakers.
Scheme 55
Scheme 56
The No. 1 stereo jack adapter assembly sends the sound signal from an external device to the multi-media module receiver assembly via 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, DCM (telematics transceiver)*1 or speakers.
- *1: w/ Manual (SOS) Switch
Scheme 57
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 58
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 59
Each unit of the navigation system connected to the AVC-LAN (communication bus) transfers the switch signals using the AVC-LAN.
If a short to +B or short to ground occurs in the AVC-LAN, the navigation system will not function normally because communication is not possible.
Scheme 60
The stereo component amplifier assembly receives a vehicle speed signal from the combination meter assembly to control the ASL function.
HINT
- 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.
- 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 61
Scheme 62
- INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) Check the output waveform. Remove the combination meter assembly with the connector still connected. Connect an oscilloscope to terminal F15-3 (+S) and body ground. Turn the engine switch on (IG). Turn a wheel slowly. Check the signal waveform according to the condition(s) in the table below. Item Condition Measurement terminal F15-3 (+S) - Body ground Tool setting 5 V/DIV., 20 ms./DIV. Vehicle condition Wheel being rotated OK The waveform is similar to that 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. TEXT IN ILLUSTRATION *a Component with harness connected (Combination Meter Assembly) NG --> See step 4 OK: Go to next step
- INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY Check the input waveform. Remove the stereo component amplifier assembly with the connector(s) still connected. Connect an oscilloscope to terminal O35-17 (SPD) and body ground. Turn the engine switch on (IG). Turn a wheel slowly. Check the signal waveform according to the condition(s) in the table below. Item Condition Measurement terminal O35-17 (SPD) - Body ground Tool setting 5 V/DIV., 20 ms./DIV. Vehicle condition Wheel being rotated OK The waveform is similar to that 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. TEXT IN ILLUSTRATION *a Component with harness connected (Stereo Component Amplifier Assembly) NG --> See step 3 OK --> See step 5
- CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - JUNCTION CONNECTOR) Disconnect the O35 stereo component amplifier assembly connector. Disconnect the F93 junction connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition O35-17 (SPD) - F93-27 Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - JUNCTION CONNECTOR) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (JUNCTION CONNECTOR)
- GO TO METER / GAUGE SYSTEM. Refer to «Speed Signal Circuit»
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [03/2012 - 07/2012]»
The stereo component amplifier assembly receives a vehicle speed signal from the combination meter assembly to control the ASL function.
HINT
- 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.
- 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 63
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 64
- 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.
- 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).
- 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).
Scheme 65
This is the power source circuit to operate the multi-media module receiver assembly.
Scheme 66
See also:
• REMOVAL [03/2012 - ]