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                                                                                                          DI-535
                                         DIAGNOSTICS    -   BODY CONTROL SYSTEM
                                                                                                           DI575-03




 Door Key Lock and Unlock Switch Circuit

CIRCUIT DESCRIPTION
The door key lock and unlock switch is installed to the door key cylinder. When the key is turned to the lock
side, terminal 1 of the switch is grounded and when the key is turned to the unlock side, terminal 3 of the
switch is grounded.

WIRING DIAGRAM

                                         D20
                                                                                               Body ECU
                                         Driver Door Key Lock
                                         & Unlock Switch
                                                          L-B 12                         13
                                             UNLOCK                             L-B
               W-B
                            1
                                                          3
                                                              IF1                        B16 UL3
                                 W-B
                           IF2                            BR-W 2
                                         2                              BR-W
                                                               IF1
                                               LOCK       1
                                                                                         11
                                                                                  BR-W
                                                                                         B16 L2
                                                                                  BR-W
                                                            BR-W14
                                              LOCK
                            6                                  IK1
                W-B              W-B                        1
                           IK1                              G-Y 4                        12
                                         2                                      G-Y
                                                               IK1                       B16 UL2
                                             UNLOCK         3

                                       D21
                                       Passenger Door Key
           A         A                 Lock & Unlock Switch
                         J4
                         J/C


                IE


                                                                                                             I10128




 2002 4RUNNER (RM887U)

                                                                     Author :              Date :          711
DI-536
                                   DIAGNOSTICS   -   BODY CONTROL SYSTEM

INSPECTION PROCEDURE

   1     Check door key lock and unlock switch (See page BE-76 ).


                                          NG         Replace door key lock and unlock switch.


  OK



   2     Check harness and connector between door key lock and unlock switch and
         body ECU (See page IN-28 ).


                                          NG         Repair or replace harness or connector.


  OK



  Proceed to next circuit inspection shown on
  problem symptoms table (See page
  DI-517 ).




2002 4RUNNER (RM887U)

                                                           Author :           Date :            712

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