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ignition


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                                                                                                                  DI-429
                                            DIAGNOSTICS   -   THEFT DETERRENT SYSTEM
                                                                                                                    DI022-17




 Ignition Switch Circuit

CIRCUIT DESCRIPTION
When the ignition switch is turned to the ACC position, battery positive voltage is applied to the terminal ACC
of the ECU. Also, if the ignition switch is turned to the ON position, battery positive voltage is applied to the
terminals ACC and IG of the ECU. When the battery positive voltage is applied to the terminal ACC of the
ECU while the theft deterrent system is activated, the warning stops. Furthermore, power supplied from the
terminals ACC and IG of the ECU is used as power for the door courtesy switch, and position switch, etc.

WIRING DIAGRAM

                                            Instrument Panel J/B                                  Theft Deterrent ECU
                      Ignition Switch
                                            4     ECU-IG       11                             13
                                      B-Y                                      L
                                            1O                 1H                             T5    IG
                  1     AM1    IG1   2
   W-L
                                            8    2 AM1 1        1
                                            1O                 1C
                                                                      B                       7
                                                                                    W-B
                                                                               A              T6    E

                                ALT    4                                                J5
                                                                                        J/C
                              FL Block
              Battery

                                                                                   ID



                                                                                                                        I13717




 2002 ECHO (RM884U)

                                                                    Author :                   Date :               599
DI-430
                                        DIAGNOSTICS   -   THEFT DETERRENT SYSTEM

INSPECTION PROCEDURE

   1      Check AM1 and ECU-IG fuses.

                                              PREPARATION:
   Instrument Panel Junction Block            (a) Remove the fuse box opening cover.
                                              (b) Remove the AM1 and ECU-IG fuses from the instrument
                                                  panel junction block.
                                              CHECK:
                                              Check continuity of the AM1 and ECU-IG fuses.
  AM1                                         OK:
  Fuse                                            Continuity



                                                NG        Check for short in all the harness and compo-
  ECU-IG Fuse                                             nents connected to the AM1 and ECU-IG fuses
                                                          (See attached wiring diagram).
                                     I12040



  OK



   2      Check voltage between terminals IG of theft deterrent ECU and body ground.

         ON                                   PREPARATION:
                                              (a) Remove the glove compartment door.
                                              (b) Disconnect the theft deterrent ECU connectors.
                                              (c) Turn the ignition switch ON.
   Disconnect
                                              CHECK:
                                              Measure voltage between terminals IG and ACC of theft deter-
                                              rent ECU connector and body ground.
         (-)    (+)
                               IG
                                              OK:
                                     I02924         Voltage: 10 - 14 V


                                                NG        Check and repair harness and connector be-
                                                          tween theft deterrent ECU and battery
                                                          (See page IN-29 ).


  OK



  Check and replace theft deterrent ECU.




2002 ECHO (RM884U)

                                                                Author :           Date :            600



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