Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di theft headligh

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                                                                                                                             DI-425
                                                   DIAGNOSTICS    -    THEFT DETERRENT SYSTEM
                                                                                                                              DI020-15




 Headlight Control Relay Circuit

CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch ON and OFF at approxi-
mately 0.4 sec. intervals. This switches the headlight control relay ON and OFF, thus flashing the headlights
(See the wiring diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes OFF and the headlight
control relay switches OFF, thus stopping the headlights flashing:
       (1) Unlock the front LH or RH door with a key.
       (2) Turn the ignition switch to IG or ON position.
       (3) Unlock the doors with the wireless door lock control system.
       (4) Wait for approximately 60 seconds.

WIRING DIAGRAM


                             Engine Room J/B
                                   H-LP RH                        9
            B-L                                          B                             Headlight               Theft Deterrent ECU
                         1                           1           ID2
                                   1        2                                          Relay
                                                                                                               10
                                                                               B   1               2   R
                                                                                                               T6   HEAD


                                                E                E
                                   R-L                                   R-L       3               5
                                                J7           J6

                               8
                                                                                                   W-B
                             EL HL HU ED
                                            C21                                                            A
                  FLASH
                                            Dimmer Switch                                      J5
                  LOW
                                                                                               J/C
                  HIGH                          Instrument Panel J/B
                          11                     6               2
                                   W-B                                         W-B
                                                1M              1O

            FL Block
                                         Battery
             MAIN
        2
                                                                                                       ID




                                                                                                                                I13715




 2002 ECHO (RM884U)

                                                                            Author :                     Date :               595
DI-426
                                            DIAGNOSTICS   -   THEFT DETERRENT SYSTEM

INSPECTION PROCEDURE
HINT:
The flow chart below is based on the premise that the headlights light up normally whenever the light control
switch is operated. If headlight operation is not normal when the light control switch is operated, proceed
to troubleshooting on page BE-2 .

   1      Check voltage between terminal HEAD of theft deterrent ECU connector and
          body ground.

                                                  PREPARATION:
         LOCK                                     (a) Remove the glove compartment door.
                                                  (b) Disconnect the theft deterrent ECU connector.
  Disconnect                                      CHECK:
                                                  Measure voltage between terminal HEAD of theft deterrent
                                                  ECU connector and body ground.
                                                  OK:
                            (+)    (-)
                                                      Voltage: 10 - 14 V
       HEAD                              I02921

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


   OK



  Check and replace theft deterrent ECU.




 2002 ECHO (RM884U)

                                                                     Author :          Date :            596



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