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DI-382
                                                  DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                                     DI4LA-27




  DTC             B1158/B1159/16                       Front Airbag Sensor (LH) Malfunction

CIRCUIT DESCRIPTION
The front airbag sensor (LH) circuit consists of the airbag sensor assembly and front airbag sensor (LH).
For details of the function of each component, see OPERATION on page RS-2 .
DTC B1158/B1159/16 is recorded when malfunction is detected in the front airbag sensor (LH) circuit.
    DTC No.                        DTC Detecting Condition                                     Trouble Area
                                                                        S Front airbag sensor (LH)
                                                                        S Wire harness
 B1158/B1159/16   S Front airbag sensor (LH) malfunction
                                                                        S Engine room main wire harness
                                                                        S Airbag sensor assembly


WIRING DIAGRAM




    F1
    Front Airbag Sensor (LH)                                                                     Airbag Sensor Assembly



                                                              4                               15
                                            W-R                           W-R (SB)
                                                             ID1                              C4     +SL
                               2




                                                              3                               26
                                             BR                            BR (SB)
                                                             ID1                              C4 -SL
                               1




                                                                                                                     H02750




2002 ECHO (RM884U)

                                                                          Author :                   Date :            552
                                                                                                    DI-383
                                         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 (LH) and the airbag sen-
                             Assembly
                                                   sor assembly, measure the voltage between body ground
   Front Airbag
                                                   and each of +SL and -SL.
   Sensor (LH)         Airbag Sensor
                       Assembly                OK:
         ON                                        Voltage: Below 1 V


               (+)              SL+



               (-)
H03355
AB0119                 SL-                       NG        Go to step 8.
H08065                                H10972




   OK



   3      Check wire harness (to ground).

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


                              SL+
         (+)


         (-)
H03355                        SL-
H08399                                H10973     NG        Go to step 9.


   OK
2002 ECHO (RM884U)

                                                                 Author :           Date :           553
DI-384
                                                    DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



   4       Check wire harness.

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


          (+)                         SL+


          (-)                         SL-
 H03355
 H08058                                        H10974
                                                          NG          Go to step 10.


  OK



   5       Check wire harness.

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


                        (-)                   SL-
 H03353
 H09521H08058                                  H12942     NG          Go to step 11.


  OK




2002 ECHO (RM884U)

                                                                             Author :           Date :           554
                                                                                                    DI-385
                                         DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



  6      Check front airbag sensor (LH).

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




               +SL      -SL




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


  OK




2002 ECHO (RM884U)

                                                                 Author :           Date :           555
DI-386
                                         DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    7       Check airbag sensor assembly.

                                               PREPARATION:
   Front Airbag
   Sensor (LH)                                 (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 (LH) 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 B1158/B1159/16             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 H01064                        H10647   OK:
                                                     DTC B1158/B1159/16 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 :              556
                                                                                                         DI-387
                                               DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



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

Front Airbag                                       PREPARATION:
Sensor (LH)                                        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 engine room main wire harness
         Wire Harness
                                                         side) between the airbag sensor assembly and the en-
         ON
                                                         gine room main wire harness, measure the voltage be-
                                                         tween body ground and each of +SL and -SL.
                              +SL       -SL
                                                   OK:
                                                         Voltage: Below 1 V
                  (-)     (+)

H03354
                                                     NG          Repair or replace engine room main wire har-
AB0119                                                           ness.
H08297                                    H10648




  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 (LH)                                        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 +SL and -SL.
                              +SL      -SL         OK:
                                                         Resistance: 1 M or Higher

            (-)         (+)
                                                      NG         Repair or replace engine room main wire har-
H03354
                                                                 ness.
H08295                                    H10649




  OK



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

2002 ECHO (RM884U)

                                                                       Author :           Date :          557
DI-388
                                            DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



  10       Check engine room main wire harness.

 Front Airbag     Engine Room Main              PREPARATION:
                  Wire Harness
 Sensor (LH)                                    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 +SL and -SL.
                                                OK:
                                                      Resistance: 1 M or Higher
                +SL        -SL




                 (+)     (-)
 H03354                                           NG          Repair or replace engine room main wire har-
 H08293                                H10650
                                                              ness.


   OK



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




2002 ECHO (RM884U)

                                                                    Author :            Date :          558
                                                                                                         DI-389
                                             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 (LH)
                                                         on the airbag sensor assembly side.
                                 Airbag
                                 Sensor            (b) Using a service wire, connect +SL and -SL of the connec-
                                 Assembly                tor (on the engine room main wire harness side) between
                 
                                                         the engine room main wire harness and the front airbag
                                                         sensor (LH).
                                                   CHECK:
   -SL          +SL                                For the connector (on the engine room main wire harness side)
                        +SL         -SL
                                                   between the airbag sensor assembly and the engine room main
                                                   wire harness, measure the resistance between +SL and -SL.
                                                   OK:
                           (+)     (-)                   Resistance: Below 1 
H03352
H09521 H08293                             H10651

                                                     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 :            559



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