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                                                                                                                         DI-333
                                                   DIAGNOSTICS         -   SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                                          DI1BL-25




  DTC                  B0138/72                          Short in P/T Squib (LH) Circuit (to B+)

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 B0138/72 is recorded when a B+ short is detected in the P/T squib (LH) circuit.
    DTC No.                         DTC Detecting Condition                                              Trouble Area
                  S Short circuit in seat belt pretensioner (LH) wire harness
                                                                                S Seat belt pretensioner (LH)
                    (to B+)
    B0138/72                                                                    S Airbag sensor assembly
                  S P/T squib (LH) malfunction
                                                                                S Wire harness
                  S Airbag sensor assembly malfunction


WIRING DIAGRAM
See page DI-323 .

INSPECTION PROCEDURE

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




   2      Check P/T squib (LH) circuit.

         ON                                               CHECK:
                                                          (a) Turn the ignition switch to ON.
                                                          (b) For the connector (on the seat belt pretensioner side) be-
                                   Airbag                     tween the seat belt pretensioner (LH) and the airbag sen-
 P/T Squib (LH)                    Sensor                     sor assembly, measure the voltage between PL+ and
                                   Assembly                   body ground.
                                                          OK:
                                                              Voltage: 0 V
                            PL+
               (-)         (+)


                                                              NG           Repair or replace harness or connector be-
AB0119                                                                     tween seat belt pretensioner (LH) and airbag
H01016
H08394                                          H08269                     sensor assembly.


  OK




2002 ECHO (RM884U)

                                                                                 Author :                       Date :    503
DI-334
                                         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) Using a service wire, connect PL+ and PL- of the connec-
                       Sensor
                                                    tor (on the seat belt pretensioner side) between the seat
                       Assembly
                                                    belt pretensioner (LH) and the airbag sensor assembly.
                                              (c) Connect negative (-) terminal cable to the battery, and
                                                    wait at least for 2 seconds.
    PL+          PL-
                               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
                                                    DI-239 ).
          DLC3            DTC B0138/72        (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.
                                              (e) Check DTC (See page DI-239 ).
        CG       Tc
 H01017                                       OK:
 H02139 AB0119
 H10600 H01085                       H10633         DTC B0138/72 is not output.
                                              HINT:
                                              Codes other than code B0138/72 may be output at this time, but
                                              they are not relevant to this check.

                                                NG         Replace airbag sensor assembly.


   OK




2002 ECHO (RM884U)

                                                                 Author :            Date :              504
                                                                                                        DI-335
                                          DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



   4       Check P/T squib (LH).

                                                PREPARATION:
P/T Squib (LH)                                  (a) Turn the ignition switch to LOCK.
                                                (b) Disconnect negative (-) terminal cable from the battery,
                          Airbag
                          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.
                                                CHECK:
                     ON
                                                (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
                                                      DI-239 ).
        DLC3                  DTC B0138/72      (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.
     CG         Tc                              (e) Check DTC (See page DI-239 ).
H01018                                          OK:
AB0119
H10600 H01085                          H10634         DTC B0138/72 is not output.
                                                HINT:
                                                Codes other than code B0138/72 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. If the malfunctioning part can not be
 detected by the simulation method, replace all SRS components including the wire harness.




2002 ECHO (RM884U)

                                                                  Author :            Date :              505



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