System Normal Condition Check

CHECK NORMAL CONDITION

If the symptom is applicable to any of the following, it is intended behavior, and not a malfunction.

PROBLEM SYMPTOMS TABLE

Symptom	Answer
A longer route than expected is chosen.	Depending on the road conditions, the navigation ECU may determine that a longer route is quicker.
Even when distance priority is high, the shortest route is not shown.	Some paths may not be advised due to safety concerns.
When the vehicle is put into motion immediately after the engine starts, the navigation system deviates from the actual position.	If the vehicle starts before the navigation system activates, the system may not react.
When running on certain types of roads, especially new roads, the vehicle position deviates from the actual position.	When the vehicle is driving on new roads not available on the map disc, the system attempts to match it to another nearby road, causing the position mark to deviate.

The following symptoms are not a malfunction, but are caused by errors inherent in the GPS, gyro sensor, speed sensor, and navigation ECU.
1. The current position mark may be displayed on a nearby parallel road.
  
  Fig 1: Identifying GPS Inherent Errors (Nearby Parallel Road)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Immediately after a fork in the road, the current vehicle position mark may be displayed on the wrong road.
  
  Fig 2: Identifying GPS Inherent Errors (After Fork In Road)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. When the vehicle turns right or left at an intersection, the current vehicle position mark may be displayed on a nearby parallel road.
  
  Fig 3: Identifying GPS Inherent Errors (When Vehicle Turns Right Or Left At Intersection)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. When the vehicle is carried, such as on a ferry, and the vehicle itself is not running, the current vehicle position mark may be displayed in the position where the vehicle was until a measurement can be performed by GPS.
  
  Fig 4: Identifying GPS Inherent Errors (When Vehicle Carried On Ferry And Vehicle Itself Not Running)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. When the vehicle runs on a steep hill, the current vehicle position mark may deviate from the correct position.
  
  Fig 5: Identifying GPS Inherent Errors (When Vehicle Runs On Steep Hill)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. When the vehicle makes a continuous turn of 360, 720,1,080, etc. degrees, the current vehicle position mark may deviate from the correct position.
  
  Fig 6: Identifying GPS Inherent Errors (When Vehicle Makes Continuous Turn Of 360, 720, 1,080 etc Degrees)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. When the vehicle moves erratically, such as constant lane changes, the current vehicle position mark may deviate from the correct position.
  
  Fig 7: Identifying GPS Inherent Errors (When Vehicle Moves Erratically)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
8. When the ignition switch is turned to the ACC or ON position on a turntable before parking, the current vehicle position mark may not point in the correct direction. The same will occur when the vehicle comes out to parking.
  
  Fig 8: Identifying GPS Inherent Errors (When Ignition Switch Put Into ACC/OFF Position)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. When the vehicle runs on a snowy road or a mountain path with the chains installed or using a spare tire, the current vehicle position mark may deviate from the correct position.
  
  Fig 9: Identifying GPS Inherent Errors (When Vehicle Runs On Snowy Road Or Mountain Path)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
10. When a tire is changed, the current vehicle position mark may deviate from the correct position.
  
  Fig 10: Identifying GPS Inherent Errors (When Tire Changed)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  - Diameter of the tire may change, causing a speed sensor error.
  - Performing the "tire change" in calibration mode will allow the system to correct the current vehicle position faster.