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                                                                                                                            DI-423
                                                 DIAGNOSTICS   -    THEFT DETERRENT SYSTEM
                                                                                                                              DI01Z-15




 Horn Relay Circuit

CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch ON and OFF in approxi-
mately 0.4 sec. cycles. This switches the horn relay ON and OFF, thus the horns blow (See the wiring dia-
gram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes OFF and the horn relay
switches OFF, thus stopping the horns from blowing:
       (1) Unlock the front LH or RH door with 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

                                                          W-R              10             W-R                   Theft Deterrent
                  Engine Room J/B
                                                                           ID3                                  ECU
                          Horn Relay                                  4                                    12
                      1             2                  W-R                       W-R
             1                               1                       ID3                                   T6   HORN
 G-W                                     3             G-R
                      5
             1                               1


                                                                                                W-R
 G-W                          HORN
                          2          1
             1                               1
                                                                                           1
                                                                           1
                                 FL Block               B-L        H4                             C16
              Battery                                                                             Horn
                                  MAIN 2                           Horn
                                                                                                  Switch




                                                                                                                                  I13714




 2002 ECHO (RM884U)

                                                                               Author :                Date :                 593
DI-424
                                           DIAGNOSTICS   -   THEFT DETERRENT SYSTEM

INSPECTION PROCEDURE
HINT:
The flow chart below is based on the premise that the horns blow normally whenever the horn switch is oper-
ated. If horn operation is not normal when the horn switch is operated, check the horn switch.

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

                                                 PREPARATION:
         LOCK                                    (a) Remove the glove compartment door.
                                                 (b) Disconnect the theft deterrent ECU connectors.
                                                 CHECK:
 Disconnect
                                                 Measure voltage between terminal HORN of theft deterrent
                                                 ECU connector and body ground.
                                                 OK:
                           (+)    (-)
                                                     Voltage: 10 - 14 V
  HORN                                  I02920



                                                   NG        Check and repair harness and connector be-
                                                             tween theft deterrent ECU and horn relay.


   OK



  Check and replace theft deterrent ECU.




2002 ECHO (RM884U)

                                                                   Author :           Date :          594



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