System Normal Condition Check

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

NORMAL CONDITION 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 the vehicle actually runs on.
  
  Fig 1: Identifying Vehicle Current Position Mark Displayed On Nearby Parallel Road
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Immediately after a fork in the road, the current vehicle position mark may be displayed on the wrong road.
  
  Fig 2: Identifying Vehicle Current Position Mark Displayed On Wrong Road
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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 Vehicle Current Position Mark When Vehicle Turns Right Or Left
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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 Vehicle Current Position Mark When Vehicle Carried
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
5. When the vehicle runs on a steep hill, the current vehicle position mark may deviate from the correct position.
  
  Fig 5: Identifying Vehicle Current Position Mark When Vehicle Runs On Steep Hill
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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 Vehicle Current Position Mark When Vehicle Makes Continuous Turn
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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 Vehicle Current Position Mark When Vehicle Moves Erratically
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
8. When the ignition switch is put into the ACC/OFF position on a turn table before parking, the current vehicle position mark may not point in the correct direction. The same will occur when the vehicle comes out of parking.
  
  Fig 8: Identifying Vehicle Current Position Mark With Ignition Switch Turned On
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
9. When the vehicle runs on the 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 Vehicle Current Position Mark With Vehicle On Snowy Road Or Mountain Path
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
10. When a tire is changed, the current vehicle position mark may deviate from the correct position.
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.
Fig 10: Identifying Vehicle Current Position Mark With Tire Changed
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.