HORN SYSTEM by yurtgc548

VIEWS: 10 PAGES: 5

									                                                                                                  77–1
                                                  HORN   –   HORN SYSTEM


HORN SYSTEM
                                                                                                 7700S–01


LOCATION




 Low Pitched Horn

        High Pitched Horn
                                                                 Steering Wheel Pad
                                                                 F Horn Button Switch
                                             Engine Room J/B
                                             Engine Room R/B
                                             F HORN Relay
                                             F HORN Fuse
                                             F P/I H–fuse




                                                                                                  B74615




2004 Prius – Preliminary Release (RM1075U)

                                                                  Author :              Date :   1115
77–2
                                             HORN   –   HORN SYSTEM
                                                                                                          7700T–01


SYSTEM DIAGRAM




                                                               HORN




                                                           1      5

                     P/I                                                  HORN Relay

                                                           2      3




                     MAIN




                                                           8               1                  1

                                             Horn Button
                        Battery                                                Low Pitched        High Pitched
                                             Switch
                                                                               Horn               Horn




                                                                                                           A89874




2004 Prius – Preliminary Release (RM1075U)

                                                               Author :              Date :                 1116
                                                                                                        77–3
                                                  HORN     –   HORN SYSTEM
                                                                                                       7700U–01


PROBLEM SYMPTOMS TABLE
                       Symptom                                    Suspected Area            See Page
                                             1.   HORN fuse                                  77–4
                                             2.   HORN relay                                 77–4
                                             3.   High pitched horn                          77–4
Horn does not sound.
                                             4.   Low pitched horn                           77–4
                                             5.   Horn button switch                          –
                                             6.   Wire harness                                –




2004 Prius – Preliminary Release (RM1075U)

                                                                       Author :    Date :              1117
77–4
                                                         HORN     –   HORN SYSTEM
                                                                                                                                    7700V–01


INSPECTION



                                                       1.     INSPECT FUSE (HORN)
                                                       (a)    Measure the HORN fuse resistance.
                                                              Resistance: Below 1 Ω
                                                       If the result is not as specified, replace the fuse.




                                              B79457



                                                       2.    INSPECT RELAY (HORN)
                                                       (a)   Remove the HORN relay from the engine room R/B.
                                                       (b)   Measure the HORN relay resistance.
                         1                    2              Standard:
   3              5
                                              5          Tester Connection                        Specified Condition

   1              2                                             3–5                                 10 kΩ or higher

                                              3                                                       Below 1 Ω
                                                                3–5
                                                                                 (when battery voltage is applied to terminals 1 and 2)

                                              B60778   If the result is not as specified, replace the relay.

                                                       3.    INSPECT HIGH PITCHED HORN ASSY
                                                       (a)   Check operation of the horn.
                                                             OK:
                                                                Measurement Condition                      Specified Operation
                                                          Battery positive (+) → Terminal 1
                                                                                                               Horn sounds
                                                         Battery negative (–) → Horn bracket

                                                       If the result is not as specified, replace the horn assy.

                                              B72265



                                                       4.    INSPECT LOW PITCHED HORN ASSY
                                                       (a)   Check operation of the horn.
                                                             OK:
                                                                Measurement Condition                      Specified Operation
                                                          Battery positive (+) → Terminal 1
                                                                                                               Horn sounds
                                                         Battery negative (–) → Horn bracket

                                                       If the result is not as specified, replace the horn assy.

                                              B72265



If all the check results are as specified above and the wire harness is normal, replace the horn button switch
(steering wheel pad) (see page 60–20).



 2004 Prius – Preliminary Release (RM1075U)

                                                                              Author :                    Date :                      1118
                                                                                                             77–5
                                                        HORN   –   HORN ASSY


HORN ASSY
                                                                                                            7700W–01


REPLACEMENT
1.     REMOVE FRONT BUMPER COVER (See page 76–2)

                                                       2.    REMOVE HIGH PITCHED HORN ASSY
                                                       (a)   Disconnect the connector.
                                                       (b)   Remove the bolt and horn.
                                                       3.    REMOVE LOW PITCHED HORN ASSY
                                                       (a)   Disconnect the connector.
                                                       (b)   Remove the bolt and horn.



                                              B74616



4.     INSTALL HIGH PITCHED HORN ASSY
(a)    Place the stay onto the baffle part in the radiator support upper, and then install the horn with the bolt.
       Torque: 20 N⋅m (204 kgf⋅cm, 15 ft⋅lbf)
(b)    Connect the connector.
5.     INSTALL LOW PITCHED HORN ASSY
(a)    Place the stay onto the baffle part in the radiator support upper, and then install the horn with the bolt.
       Torque: 20 N⋅m (204 kgf⋅cm, 15 ft⋅lbf)
(b)    Connect the connector.




 2004 Prius – Preliminary Release (RM1075U)

                                                                        Author :       Date :               1119

								
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