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                                                                                                                     DI-323
                                               DIAGNOSTICS         -   SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                                      DI16W-46




  DTC                B0135/73                       Short in P/T Squib (LH) Circuit

CIRCUIT DESCRIPTION
The P/T squib (LH) circuit consists of the airbag sensor assembly and seat belt pretensioner (LH).
It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see OPERATION on page RS-2 .
DTC B0135/73 is recorded when a short is detected in the P/T squib (LH) circuit.
    DTC No.                     DTC Detecting Condition                                              Trouble Area
               S Short circuit between PL+ wire harness and PL- wire har-
                                                                            S Seat belt pretensioner (LH)
                 ness of squib
    B0135/73                                                                S Airbag sensor assembly
               S P/T squib (LH) malfunction
                                                                            S Wire harness
               S Airbag sensor assembly malfunction


WIRING DIAGRAM



                                                                                            Airbag Sensor Assembly




                P14
                P/T Squib (LH)

                                                                                     2
                                           1                 Y-B
                                                                                     C3 PL+



                                           2                                         1
                                                               Y
                                                                                     C3 PL-




                                                                                                                      H01454




2002 ECHO (RM884U)

                                                                             Author :                       Date :    493
DI-324
                                           DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM

INSPECTION PROCEDURE

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




    2    Check P/T squib (LH) circuit.

                                                 PREPARATION:
                                                 Release the airbag activation prevention mechanism of the
                             Airbag
                                                 connector (on the airbag sensor assembly side) between the
P/T Squib (LH)               Sensor
                             Assembly            airbag sensor assembly and the seat belt pretensioner (LH).
                                                 (See page DI-239 )
                                                 CHECK:
                                                 For the connector (on the seat belt pretensioner side) between
          PL+          PL-                       the seat belt pretensioner (LH) and the airbag sensor assembly,
                                                 measure the resistance between PL+ and PL-.
                                                 OK:
                                                       Resistance: 1 M or Higher

            (+)      (-)
H01016
H02141                                  H02211



                                                   NG        Repair or replace harness or connector be-
                                                             tween seat belt pretensioner (LH) and airbag
                                                             sensor assembly.


   OK




2002 ECHO (RM884U)

                                                                   Author :             Date :             494
                                                                                                    DI-325
                                       DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



   3        Check airbag sensor assembly.

 P/T Squib (LH)                             PREPARATION:
                                            (a) Connect the connector to the airbag sensor assembly.
                      Airbag                (b) Connect negative (-) terminal cable to the battery, and
                      Sensor                      wait at least for 2 seconds.
                      Assembly              CHECK:
                                            (a) Turn the ignition switch to ON and wait at least for 20 se-
                                                  conds.
                                            (b) Clear DTC stored in memory. (See page DI-239 )
                 ON
                                            (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-
                                                  conds.
         DLC3           DTC B0135/73        (e) Check DTC. (See page DI-239 )
                                            OK:
                                                  DTC B0135/73 is not output.
                                            HINT:
     CG         Tc                          Codes other than code B0135/73 may be output at this time, but
H01017
                                            they are not relevant to this check.
AB0119
H10600 H01086                      H10627

                                              NG         Replace airbag sensor assembly.


  OK




2002 ECHO (RM884U)

                                                               Author :           Date :              495
DI-326
                                            DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    4       Check P/T squib (LH).

                                                 PREPARATION:
                 
                                                 (a) Turn the ignition switch to LOCK.
                           Airbag                (b) Disconnect negative (-) terminal cable from the battery,
P/T Squib (LH)             Sensor                      and wait at least for 90 seconds.
                           Assembly
                                                 (c) Connect the seat belt pretensioner (LH) connector.
                                                 (d) Connect negative (-) terminal cable to the battery, and
                                                       wait at least for 2 seconds.
                      ON                         CHECK:
                                                 (a) Turn the ignition switch to LOOK, and wait at least for 20
                                                       second.
                                                 (b) Turn the ignition switch to ON, and wait at least for 20 se-
                                                       conds.
         DLC3                DTC B0135/73        (c) Clear DTC stored in memory. (See page DI-239 )
                                                 (d) Turn ignition switch to LOCK, and wait at least for 20 se-
                                                       conds.
                                                 (e) Turn the ignition switch to ON, and wait at least for 20 se-
     CG          Tc
                                                       conds.
 H01018                                          (f)   Check DTC. (See page DI-239 )
 AB0119
 H10600 H01086                          H10628   OK:
                                                       DTC B0135/73 is not output.
                                                 HINT:
                                                 Codes other than code B0135/73 may be output at this time, but
                                                 they are not relevant to this check.

                                                   NG         Replace seat belt pretensioner (LH).


   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 :              496



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