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DI-374
                                                  DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                                     DI4LA-26




  DTC             B1156/B1157/15                       Front Airbag Sensor (RH) Malfunction

CIRCUIT DESCRIPTION
The front airbag sensor (RH) circuit consists of the airbag sensor assembly and front airbag sensor (RH).
For details of the function of each component, see OPERATION on page RS-2 .
DTC B1156/B1157/15 is recorded when a malfunction is detected in the front airbag sensor (RH) circuit.
    DTC No.                        DTC Detecting Condition                                     Trouble Area
                                                                        S Front airbag sensor (RH)
                                                                        S Wire harness
 B1156/B1157/15   S Front airbag sensor (RH) malfunction
                                                                        S Engine room main wire harness
                                                                        S Airbag sensor assembly


WIRING DIAGRAM




    F2
    Front Airbag Sensor (RH)                                                                     Airbag Sensor Assembly



                                                              2                                9
                                         B-W                                B-W (SB)
                                                             ID1                               C4    +SR
                               2




                                                              1                                20
                                         BR-W                              BR-W(SB)
                                                             ID1                               C4 -SR
                               1




                                                                                                                     H02750




2002 ECHO (RM884U)

                                                                          Author :                   Date :            544
                                                                                                   DI-375
                                        DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM

INSPECTION PROCEDURE

   1      Prepare for inspection (See step 1 on page DI-390 ).




   2      Check wire harness (to B+).

                                              CHECK:
                                              (a) Turn the ignition switch to ON.
                          Airbag              (b) For the connector (on the airbag sensor assembly side)
                          Sensor
                                                  between the front airbag sensor (RH) and the airbag sen-
                          Assembly
                                                  sor assembly, measure the voltage between body ground
Front Airbag
Sensor (RH)                                       and each of +SR and -SR.
                      Airbag Sensor
                      Assembly                OK:
         ON                                       Voltage: Below 1 V

                            SR+
           (+)



H03355
           (-)              SR-
AB0119                                          NG        Go to step 8.
H03363                               H03445




  OK



   3      Check wire harness (to ground).

                                              CHECK:
                                              For the connector (on the airbag sensor assembly side) be-
                           Airbag             tween the front airbag sensor (RH) and the airbag sensor as-
                           Sensor             sembly, measure the resistance between body ground and
                           Assembly
                                              each of +SR and -SR.
 Front Airbag                                 OK:
 Sensor (RH)         Airbag Sensor
                     Assembly                       Resistance: 1 M or Higher



                            SR+
          (+)


          (-)                SR-
H03353
H03361                               H03443     NG        Go to step 9.


  OK
2002 ECHO (RM884U)

                                                                Author :           Date :           545
DI-376
                                               DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    4      Check wire harness.

 Front Airbag                                        CHECK:
 Sensor (RH)                                         For the connector (on the airbag sensor assembly side) be-
                                 Airbag              tween the front airbag sensor (RH) and the airbag sensor as-
                                 Sensor              sembly, measure the resistance between +SR and -SR.
                                 Assembly
                                                     OK:
                                                           Resistance: 1 M or Higher
                            Airbag Sensor
                            Assembly



                (+)                SR+


                (-)
                                   SR-
 H03355
 H03356                                     H09518
                                                       NG        Go to step 10.


   OK



    5      Check wire harness.

  Front Airbag                                       PREPARATION:
  Sensor (RH)
                                                     Using a service wire, connect +SR and -SR of the connector
                                 Airbag              (on the front airbag sensor (RH) side) between the airbag sen-
                                 Sensor
                                                     sor assembly and the front airbag sensor (RH).
                                 Assembly
                                                     CHECK:
                                                     For the connector (on the airbag sensor assembly side) be-
                              Airbag Sensor
                              Assembly
                                                     tween the front airbag sensor (RH) and the airbag sensor as-
 SR+              SR-
                                                     sembly, measure the resistance between +SR and -SR.
                                                     OK:
                      (+)                SR+               Resistance: Below 1 


                      (-)
                                         SR-
 H03353
 H09521H03356                               H09523     NG        Go to step 11.


   OK




2002 ECHO (RM884U)

                                                                        Author :           Date :             546
                                                                                                  DI-377
                                       DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



  6      Check front airbag sensor (RH).

Front Airbag                               CHECK:
Sensor (RH)                                For the connector of the front airbag sensor (RH), measure the
                            Airbag
                                           resistance between +SR and -SR.
                            Sensor         OK:
                            Assembly             Resistance: 300 - 1500 




           +SR        -SR




               (+)   (-)
H04504
H01062                            H08346
                                             NG          Replace front airbag sensor (RH).


  OK




2002 ECHO (RM884U)

                                                               Author :           Date :           547
DI-378
                                        DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    7       Check airbag sensor assembly.

                                              PREPARATION:
   Front Airbag
   Sensor (RH)                                (a) Turn the ignition switch to LOCK.
                                              (b) Disconnect negative (-) terminal cable from the battery,
                          Airbag
                                                    and wait at least for 90 seconds.
                          Sensor
                          Assembly            (c) Connect the front airbag sensor (RH) connector and air-
                                                    bag sensor assembly connector.
                  
                                              (d) Connect negative (-) terminal cable to the battery, and
                                                    wait at least for 2 seconds.
                 ON                           CHECK:
                                              (a) Turn the ignition switch to ON, and wait at least for 20 se-
                                                    conds.
                                              (b) Clear DTC stored in memory (See step 5 on page
        DLC3          DTC B1156/B1157/15            DI-239 ).
                                              (c) Turn the ignition switch to LOCK, and wait at least for 20
                                                    seconds.
                                              (d) Turn the ignition switch to ON, and wait at least for 20 se-
   CG        Tc                                     conds.
 H02757
                                              (e) Check DTC (See page DI-239 ).
 AB0119
 H10600 H01063                       H10638   OK:
                                                    DTC B1156/B1157/15 is not output.
                                              HINT:
                                              Codes other than code B1156/B1157/15 may be output at this
                                              time, but they are not relevant to this check.

                                                NG        Replace airbag sensor assembly.


   OK



  From the results of the above inspection, the malfunctioning part can now be considered normal.
  To make sure of this, use the simulation method to check.




2002 ECHO (RM884U)

                                                                Author :             Date :              548
                                                                                                          DI-379
                                               DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



   8       Check engine room main wire harness (to B+).

Front Airbag                                        PREPARATION:
Sensor (RH)                                         Disconnect the engine room main wire harness connector on
                                    Airbag          the airbag sensor assembly side.
                                    Sensor          CHECK:
                                    Assembly        (a) Turn the ignition switch to ON.
         Engine Room Main                           (b) For the connector (on the RH front door wire harness
         Wire Harness
                                                          side) between the airbag sensor assembly and the en-
         ON
                                                          gine room main wire harness, measure the voltage be-
                              +SR      -SR                tween body ground and each of +SR and -SR.
                                                    OK:
                                                          Voltage: Below 1 V
                 (-)         (+)

H03354
                                                      NG         Repair or replace engine room main wire har-
AB0119                                                           ness.
H08298                                     H10639




  OK



 Repair or replace harness or connector between airbag sensor assembly and engine room main
 wire harness.



   9       Check engine room main wire harness (to ground).

Front Airbag                                        PREPARATION:
Sensor (RH)                                         Disconnect the engine room main wire harness connector on
                                    Airbag          the airbag sensor assembly side.
                                    Sensor          CHECK:
                                    Assembly        For the connector (on the engine room main wire harness side)
                                                    between the airbag sensor assembly and the engine room main
  Engine Room Main                                  wire harness, measure the resistance between body ground
  Wire Harness                                      and each of +SR and -SR.
                         +SR         -SR            OK:
                                                          Resistance: 1 M or Higher

           (-)         (+)
                                                      NG         Repair or replace engine room main wire har-
H03354
                                                                 ness.
H08296                                     H10640




  OK



 Repair or replace harness or connector between airbag sensor assembly and engine room main
 wire harness.

2002 ECHO (RM884U)

                                                                       Author :           Date :           549
DI-380
                                             DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



  10       Check engine room main wire harness.

 Front Airbag     Engine Room Main               PREPARATION:
                  Wire Harness
 Sensor (RH)                                     Disconnect the engine room main wire harness connector on
                                  Airbag         the airbag sensor assembly side.
                                  Sensor         CHECK:
                                  Assembly       For the connector (on the engine room main wire harness side)
                                                 between the airbag sensor assembly and the engine room main
                                                 wire harness, measure the resistance between +SR and -SR.
                                                 OK:
                +SR         -SR
                                                       Resistance: 1 M or Higher



                  (+)     (-)

 H03354
 H08294                                 H10641
                                                   NG          Repair or replace engine room main wire har-
                                                               ness.


   OK



  Repair or replace harness or connector between airbag sensor assembly and engine room main
  wire harness.




2002 ECHO (RM884U)

                                                                     Author :            Date :          550
                                                                                                        DI-381
                                            DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



 11        Check engine room main wire harness.

                      Engine Room Main            PREPARATION:
Front Airbag
                      Wire Harness                (a) Disconnect the engine room main wire harness connector
Sensor (RH)
                                                        on the airbag sensor assembly side.
                                 Airbag
                                 Sensor           (b) Using a service wire, connect +SR and -SR of the con-
                                 Assembly               nector (on the engine room main wire harness side) be-
                 
                                                        tween the engine room main wire harness and the front
                                                        airbag sensor (RH).
                                                  CHECK:
   +SR          -SR     +SR          -SR          For the connector (on the engine room main wire harness side)
                                                  between the airbag sensor assembly and the engine room main
                                                  wire harness, measure the resistance between +SR and -SR.
                           (+)     (-)            OK:
                                                        Resistance: Below 1 
H03352
H09521 H08294                            H10642

                                                    NG        Repair or replace engine room main wire har-
                                                              ness.


  OK



 Repair or replace harness or connector between airbag sensor assembly and engine room main
 wire harness.




2002 ECHO (RM884U)

                                                                    Author :           Date :            551



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