Section 255 (LEXUS Navigation System - Diagnosis): Pre-Check

WARNING: This page is about a different car, the 2004 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

USER TROUBLES UNDER NORMAL CONDITION OF THE NAVIGATION SYSTEM
1. Voice guidance is not performed even though the system is in normal condition when:
  1. The destination is not set up.
  2. The vehicle is not driving on the set route. (The remaining distance is not displayed at the lower left of the map screen that tells the current position of the vehicle.)
  3. "Guidance in Other Modes" is not set up. (In this case no voice guidance is given except on the map screen.)
2. The vehicle icon turns around arbitrarily on the screen even when the system is in normal condition. If the ignition switch is turned to "ACC" or "ON" while the vehicle is turning around such as being on the turntable, the Navigation System memorizes the angle speed of that moment as the standard figure. To solve this problem, at the vehicle speed of 0 MPH (0 km/h), turn off the ignition switch, and then turn it to "ACC" or "ON" again to see whether any trouble occurs again.
INSPECTION OF THE LOCATION WITH TROUBLE OCCURRENCE
1. Check whether the wrong display of the vehicle icon appears in a certain location or in several locations.
  HINT:
  
  It is difficult to determine the accurate vehicle position when driving on a freeway, a looped road or a road which runs in parallel with another, and immediately after going out of the parking area. In such cases the vehicle icon can be displayed off the real position of the vehicle.
OUTLINE OF AVC-LAN
1. Each unit of the LEXUS navigation system connected with AVC-LAN (communication bus) transmits a signal of each switch. When +B short or GND short occurs in this AVC-LAN, the LEXUS navigation system will not function normally as the communication is discontinued. In this AVC-LAN, the radio and player becomes the master of the communication, having a resistance necessary for transmitting the signals.
Fig 1: RSA System Communication Diagram
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: RSE System Communication Diagram
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Fig 3: RSA RSE Back Monitor System Communication Diagram
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DIAGNOSIS SYSTEM MODE

Fig 4: Diagnosis System Mode Display Flow Chart
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1. Start-up and finishing of the diagnosis.
  HINT:
  
  Before starting the diagnosis system, make sure that the mark appears on the screen after turning on the IG switch. If not, some items cannot be checked.
2. Diagnosis start-up by light control switch.
  1. Vehicle speed should be 0 km/h (0 mph).
  2. Turn the ignition switch to ACC or ON.
  3. While pressing the "INFO" switch on the multi display, turn the light control switch from OFF --> TAIL --> OFF --> TAIL --> OFF --> TAIL --> OFF.
    
    Fig 5: Identifying Info Switch
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 6: Info Display Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  HINT:
  - When diagnosis system starts, service check screen is displayed and the service check begins.
  - Select MENU to display diagnosis check menu.
3. Diagnosis start-up by touch switch.
  1. Vehicle speed should be 0 km/h (0 mph).
  2. Turn the ignition switch to ACC or ON.
  3. Activate the screen adjustment screen.
  4. Alternately touch the upper and lower bottom parts of the left end of the screen 3 times.
4. Finishing the diagnosis system
  Turn the ignition switch off to finish the mode.
  
  Fig 7: Identifying Concealed Touch Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
SYSTEM CHECK MODE

Fig 8: System Check Mode Display Flow Chart
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1. System Check Mode
2. System Check
  1. Start the diagnosis system.
    
    Fig 9: Identifying Navigation system Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 10: Diagnosis System Display Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Components: /*8
    
    Fig 11: Components Display Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    
    System check displays the check results based on the information obtained from each component's response to "System Check Execution" and "Diagnosis Memory Request", and the information of "Current DTC Notification" (the Unit Check Mode and the LAN Monitor information that will be displayed on the next screens.).
  2. Read Check Result
    
    Fig 12: Check Result Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    - After repair and check, press "Code CLR" for more than 3 sec. to delete diagnosis memory.
    - After deleting diagnosis memory, press "Recheck" and make sure "OK" is displayed on the screen.
  3. "EXCH", "CHEK" and "Old" can be used as switches to activate "Unit Check Mode" for detail information. Check troubled parts of the components in these modes by referring to the DTC code list.
    
    Fig 13: Identifying Navigation System Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 14: Display Item Description Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    - Detecting Unit DTC activates the Unit Check Mode on the screen.
    - In the Unit Check Mode, DTC identified as "EXCH" in the Service Check is displayed as classified into Current DTC and Past DTC.
3. LAN Monitor
  1. Start the Diagnosis System.
    
    Fig 15: Identifying LAN Monitor
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 16: LAN Monitor Display Item Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    
    System Check displays the check results based on the information obtained from each component's response to "System Check Execution" and "Diagnosis Memory Request", and the information of "Current DTC Notification" (the LAN Monitor that will be displayed on the next screens).
  2. Read Check Result
    
    Fig 17: LAN Monitor Check Result Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    - After repair and check, press "Code CLR" for more than 3 sec. to delete diagnosis memory.
    - After deleting diagnosis memory, press "Recheck" and make sure "OK" is displayed on the screen.
  3. "CHEK" can be used as a switch to activate "LAN Monitor" for detail information. Check troubled parts of the components in these modes by referring to the DTC code list.
    
    Fig 18: Identifying Navigation System Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    
    Detecting no LAN DTC activates the LAN Check Mode on the screen.
    
    Fig 19: Display Item Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DISPLAY CHECK MODE

Fig 20: Display Check Mode Display Flow Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Display Check Mode
  
  Fig 21: Identifying Navigation System Display
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 22: Display Check Mode Content Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  In Display Check Mode, above checks can be performed.
  
  Fig 23: Display Item Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Display Color Bar Check
  1. Start the Diagnosis System.
  2. Select "MENU".
  3. Select "Display Check".
  4. Select "Color Bar Check".
  5. Make sure that each color name is corresponding to each color on the bar.
    
    Fig 24: Identifying Color Bar Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    
    Select Black, Red, Green, Blue, White and Stripe to display selected colors and stripe on the entire screen.
  6. Compare with the Color Bar Check in the Navigation Check and make sure that no difference is found.
    
    Fig 25: Display Item Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Display Touch Switch Check
  1. Start the Diagnosis system.
  2. Select "MENU".
  3. Select "Display Check".
  4. Select "Touch Switch Check".
  5. Touch the screen and make sure that every line reacts to the touch.
    
    Fig 26: Identifying Touch Switch Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    
    After the Touch Switch Check for vertical lines, press "Next" to check horizontal lines.
    
    Fig 27: Display Item Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Display Touch Point Check
  1. Start the Diagnosis system.
  2. Select "MENU".
  3. Select "Display Check".
  4. Select "Touch Point Check".
  5. The position detected by the pressure sensing touch switch is checked.
    
    Fig 28: Identifying Touch Point Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 29: Display Item Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Display Panel Switch Check
  1. Start the Diagnosis system.
  2. Select "MENU".
  3. Select "Display Check".
  4. Select "Panel Switch Check".
  5. Press each switch and make sure that it corresponds to the display on the screen.
    
    Fig 30: Identifying Panel Switch Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 31: Display Data Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Display Vehicle Signal Check
  1. Start the Diagnosis system.
  2. Select "MENU".
  3. Select "Display Check".
  4. Select "Vehicle Signal Check".
  5. Check the status of the vehicle signal (PKB, SPEED, TAIL, REV) loaded into the display.
    
    Fig 32: Identifying Vehicle Signal Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    
    Vehicle signal data is updated every 1 second.
    
    Fig 33: Display Item Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NAVIGATION CHECK MODE

Fig 34: Navigation Check Mode Display Flow Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Navigation Check Mode
  
  Fig 35: Identifying Navigation System Display
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 36: Navigation Check Mode Display Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  - In the Navigation Check mode, the checks mentioned above can be conducted.
  - The Navigation ECU operates each Navigation Check screen.
    
    Fig 37: Display Item Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. GPS Information
  1. Start the Diagnosis system.
  2. Select "Menu".
  3. Select "Navigation Check".
  4. Select "GPS Information".
  5. Check the GPS-related information.
    
    Fig 38: Identifying Navigation System Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 39: GPS Information Display Item Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Status of Wave Reception: /*5
    
    Fig 40: Wave Reception Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Measurement Status: /*6
    
    Fig 41: Measurement Status Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Vehicle Sensors
  1. Start the Diagnosis system.
  2. Select "MENU".
  3. Select "Navigation Check".
  4. Select "Vehicle sensors".
  5. Check the vehicle signals (ACC, REV, SPD) and the output signal of the gyro sensor introduced into the navigation ECU.
    
    Fig 42: Identifying Vehicle Sensor Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 43: Vehicle Sensor Items Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Navigation Color Bar Check
  1. Start the Diagnosis system.
  2. Select "MENU".
  3. Select "Navigation Check".
  4. Select "Color Bar Check".
  5. Make sure that the set color matches the display color.
  6. Compare with the Color Bar Check in the Display Check and make sure that no difference is found.
    
    Fig 44: Identifying Navigation Color Bar Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 45: Display Item Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Parts Information
  1. Start the Diagnosis system.
  2. Select "MENU".
  3. Select "Navigation Check".
  4. Select "Parts Information".
  5. Check the program and disc version.
    
    Fig 46: Identifying Parts Information Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 47: Parts Information Display Item Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Memory Copy/Paste
  HINT:
  
  This function is not available.
  
  Fig 48: Identifying Memory Copy/Paste Display
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 49: Memory Copy/Paste Display Item Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002