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                                                                                                   DI-549
                                      DIAGNOSTICS   -   THEFT DETERRENT SYSTEM
                                                                                                       DI070-08




 Key Unlock Warning Switch Circuit

CIRCUIT DESCRIPTION
The key unlock warning switch goes ON when the ignition key is inserted in the key cylinder and goes OFF
when the ignition key is removed.
The ECU operates the key confinement prevention function while the key unlock warning switch is ON.

WIRING DIAGRAM

                                                                                 Theft Deterrent ECU
         Key Unlock                 Driver Side J/B No.1
         Warning Switch
                          J6           5             7                            6
      W-B            L-B        L-B                         O        16    O
                                     1M             1D               IG2         T3 KSW
         2           1 D      D
                       Junction
                       Connector
        B
           J3
           Junction Connector
        B
    W-B

        ED




                                                                                                         I04435




2001 SIENNA (RM787U)

                                                                Author :         Date :                703
DI-550
                                     DIAGNOSTICS     -   THEFT DETERRENT SYSTEM

INSPECTION PROCEDURE

    1     Check key unlock warning switch.

                                           PREPARATION:
                                           Disconnect key unlock warning switch connector.
                         2 (-)
                                           CHECK:
                                           Check continuity between terminal 1 and 2 of key unlock warn-
                                           ing switch connector, when the key is inserted into the key cylin-
                                           der or removed.
                                           OK:
                          1 (+)
                                                Switch position          Tester connection            Specified condition
 I00297
 I00296                           I00305
                                               ON (Key inserted)               1-2                        Continuity
                                              OFF (Key removed)                 -                       No continuity


                                             NG          Replace key unlock warning switch.


   OK




    2     Check harness and connectors between ECU and key unlock warning switch,
          key unlock warning switch and body ground (See page IN-31 ).


                                             NG          Repair or replace harness or connector.


   OK



  Check and replace theft deterrent ECU.*1


                                           *1: When there is a malfunction that prevents the theft deterrent
                                           system from being set, proceed to the next numbered circuit in-
                                           spection shown in matrix chart (See page DI-532 ).




2001 SIENNA (RM787U)

                                                                   Author :                  Date :                     704

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