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                                                                                                           DI-215
                                          DIAGNOSTICS      -   TIRE PRESSURE WARNING SYSTEM
                                                                                                             DI235-01




Tire Pressure Warning Standardization Switch

WIRING DIAGRAM



                                                                                   ABS Actuator and ECU
                                                       Tire Pressure Warning
                           Driver Side J/B No.1        Standardization Switch
                            8                3                                      12
                    W-B                              W-B       1        2   GR-B
                           1J               1M                                      A5 INIT


               IJ




                                                                                                              F04213



INSPECTION PROCEDURE
                                                  PREPARATION:
       E1                                         (a) Turn the ignition switch OFF.
                                                  (b) Using SST, connect terminals Ts and E1 of DLC1.
                                                      SST 09843-18020
                                                  (c) Start the engine.



          Ts        DLC1
                                       F02201




  1     Check operation of tire pressure warning standardization switch.

                                                  CHECK:
                                                  When press the tire pressure warning standardization switch
                                                  and check that the tire pressure warning light flashes 3 times
                                                  then it goes off.




                                       F03261



                                                    OK         Check the air pressure of the tire and adjust it to
                                                               the specified pressure, after then initialize this
                                                               system (See page DI-209 ).


  NG

2001 SIENNA (RM787U)

                                                                     Author :             Date :             369
DI-216
                                  DIAGNOSTICS   -    TIRE PRESSURE WARNING SYSTEM



   2     Check tire pressure warning standardization switch.

                                        PREPARATION:
                                        (a) Remove the tire pressure warning standardization switch.
                                        (b) Remove the connector.
                                        CHECK:
                                        Check continuity between terminals 1 and 2 of tire pressure
                                        warning standardization switch when the switch is ON and OFF.
                                        OK:
                                                    Switch position                  Condition
                               F03260
                                                     ON (pushed)                     Continuity
                                                    OFF (released)          No continuity (1M or higher)


                                          NG        Replace the tire pressure warning standardiza-
                                                    tion switch.


  OK



   3     Check for open circuit in harness and connector between ABS ECU and tire
         pressure warning standardization switch, tire pressure warning standardization
         switch and body ground (See page IN-31 ).


                                          NG        Repair or replace harness or connector.


  OK



  Check and replace ABS actuator assembly.




2001 SIENNA (RM787U)

                                                               Author :        Date :                      370



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