Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 21pl9 ciavn23

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05-1336
                                              DIAGNOSTICS   -   NAVIGATION SYSTEM                                05FH5-04




GPS MARK IS NOT DISPLAYED

INSPECTION PROCEDURE
      1      CHECK CABIN

(a)       Check the cabin for any object that might interrupt radio reception on the instrument panel. If such an
          object exists, remove it and check if the GPS mark reappears.
HINT:
GPS works using extremely weak radio waves originating from satellites. If the signal is interrupted by ob-
structions or another radio wave, the GPS system may not be able to properly receive the signal.
      OK: Mark appears.
                                                      OK        NORMAL OPERATION

      NG

      2      CHECK SURROUNDINGS

(a)       Check if the vehicle is in a location where GPS signal reception is bad. If the vehicle is in such a place,
          move it elsewhere and check if the GPS mark reappears.
HINT:
S         GPS uses 24 satellites in 6 orbits so that at any time 4 satellites will be in line-of-sight of your vehicle.
S         GPS signals may not be received, however, based on surroundings, vehicle direction, and time.




 2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                       Author :              Date :                1519
                                                                                                             05-1337
                                           DIAGNOSTICS     -   NAVIGATION SYSTEM

S         The following illustrations show some conditions where it may be difficult to receive GPS signals.




                  In a tunnel                       In a building               Under an overpass




            Forest or tree-lined path             Between tall buildings           Under a cliff, overhang

                                                                                                                I38586



          OK: GPS mark is displayed.
                                                    OK         RETURNS TO NORMAL

      NG

      3      NAVIGATION CHECK MODE(GPS IMFORMATION)

(a)       Enter the "Navigation Check" mode (GPS information) (see page 05-1299 ).
                                              (b) Check how many of the following codes occur in the
                                                   "STS" column.
                                                   For DENSO Models: T, P
                                                   For AISIN AW Models: 04H, 08H
                                                   OK: At least 3 codes occur.



                                                    OK         REPLACE RADIO AND NAVIGATION ASSY
                                         I38226                (SEE PAGE 67-9 )

      NG

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
    (SEE PAGE 05-1286 )


 2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                     Author :             Date :               1520

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