Reading and Clearing Diagnostic Trouble Codes

NOTE: This is the only information provided by the manufacturer for reading diagnostic trouble codes for this system.

PRE-CHECK

1. USER TROUBLES UNDER NORMAL CONDITION OF THE NAVIGATION SYSTEM
a. Voice guidance is not performed even though the system is in normal condition when:
1. The destination is not setup.
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.)

b. 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, and see whether any trouble occurs again.

2. INSPECTION OF THE LOCATION WITH TROUBLE OCCURRENCE
a. Examine 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 a out of the parking area. In such cases the vehicle icon can be displayed off the real position of the vehicle.

3. OUTLINE OF AVC-LAN




a. 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.

4. CELLULAR MOBILE PHONE (Option)




a. Characteristics of Cellular Mobile Phone

HINT:
*"Preparation for sending out radio waves" has the following process.
Picking up the receiver (turning on the phone switch) sends out the dial signal to the Radio Circuit Control Center.
The center chooses the radio base of the highest-sensitivity in receiving the dial signal.
It also makes a telecommunication circuit by choosing a vacant channel out of many.
This process is called "Preparation for Sending out Radio Waves".

b. Before troubleshooting, check the following points:
1. Troubles should be checked where the cellular mobile phone can receive enough radio wave.
2. Troubles occur even with different cellular mobile phones (even with different telephone companies, if possible).
3. Battery life of the cellular mobile phone and its recharge state must be in good condition.
4. The antenna of the cellular mobile phone should be stuck out.
5. Troubles occur even when the cellular mobile phone is formatted.

HINT:
- When it is formatted, the data and the registration of telephone numbers in the cellular mobile phone will be deleted.
- The member ID and the password need to be reentered.

5. DIAGNOSIS SYSTEM MODE






HINT: Diagnosis System Mode is operated as shown.

6. SERVICE CHECK MODE






HINT: Service Check Mode is operated as shown.

7. DISPLAY CHECK MODE






HINT: Display Check Mode is operated as shown.

8. NAVIGATION CHECK MODE






HINT: Navigation Check Mode is operated as shown.

9. START-UP AND FINISHING OF THE DIAGNOSIS




a. Diagnosis Start-up by touch switch.
1. Vehicle speed should be 0 km/h (0 mph).
2. Apply the parking brake.
3. Turn the ignition switch to ACC or ON.
4. Push the DISPLAY button.
5. Activate the screen adjustment screen.
6. Alternately touch the upper and lower bottom parts of the left end of the screen 3 times.






HINT: Before starting the Diagnosis System, make sure that the map appears on the screen after turning on the IG switch. If not, some items cannot be checked.






HINT:
- When Diagnosis System starts, Service Check screen is displayed and the service check begins.
- Select MENU to display Diagnosis Check Menu.

b. Finishing the Diagnosis System
Turn the ignition switch off to finish the mode.

10. SERVICE CHECK MODE







a. Service Check
1. Start the Diagnosis System.

HINT: Service 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 and the LAN Check information that will be displayed on the next screens.).




2. Read Check Result

HINT:
- After repair and check, press "Code CLR" for more than 3 seconds 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 "LAN Check Mode" and "Unit Check Mode" for detail information. Check troubled parts of the components in these modes by referring to the DTC code list.

HINT:
- Detecting Unit DTC activates the Unit Check Mode on the screen.
- Detecting no LAN DTC activates the LAN Check Mode on the screen.
- Use the displayed switch to change to the Unit Check Mode and the LAN Check Mode.
- The LAN Check Mode chooses and displays the LAN DTC out of DTC of components identified as "CHEK" in the Service Check.
- In the Unit Check Mode, DTC which is identified as "EHCK" in the Service Check, is displayed as classified into Current DTC and Past DTC.







11. DISPLAY CHECK MODE

HINT: In Display Check Mode, above checks can be performed.




a. 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.

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.

b. 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.






HINT: After the Touch Switch Check for vertical lines, press "Next" to check horizontal lines.




c. 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.




d. 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 (Battery, IG, PKB, SPEED, TAIL) loaded into the display.

HINT: Vehicle signal data is updated every 1 second.

12. NAVIGATION CHECK MODE









HINT:
- In the Navigation Check mode, the checks mentioned above can be conducted.
- The Navigation ECU operates each Navigation Check screen.




a. GPS Information
1. Start the Diagnosis system.
2. Select "MENU".
3. Select "Navigation Check".
4. Select "GPS Information".







5. Check the GPS-related information.




b. 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.




c. 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.