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DI-330
                                                      DIAGNOSTICS         -   SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                                            DI1BK-21




  DTC                     B0137/71                          Short in P/T Squib (LH) Circuit
                                                            (to Ground)

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 B0137/71 is recorded when a ground short is detected in the P/T squib (LH) circuit.
    DTC No.                            DTC Detecting Condition                                              Trouble Area
                     S Short circuit in P/T squib (LH) wire harness (to ground)    S Seat belt pretensioner (LH)
    B0137/71         S P/T squib (LH) malfunction                                  S Airbag sensor assembly
                     S Airbag sensor assembly malfunction                          S Wire harness


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.

                                                             CHECK:
 P/T Squib (LH)
                                                             For the connector (on the seat belt pretensioner side) between
                                                             the seat belt pretensioner (LH) and the airbag sensor assembly,
                                 Airbag
                                 Sensor                      measure the resistance between PL+ and body ground.
                                 Assembly                    OK:
                                                                   Resistance: 1 M or Higher


                            PL+
               (-)         (+)


                                                                 NG           Repair or replace harness or connector be-
                                                                              tween seat belt pretensioner (LH) and airbag
H01016                                                                        sensor assembly.
H08392                                             H08396




   OK




2002 ECHO (RM884U)

                                                                                     Author :                      Date :     500
                                                                                                      DI-331
                                         DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



   3       Check airbag sensor assembly.

                                              PREPARATION:
                                              (a) Connect the connector to the airbag sensor assembly.
                         Airbag
                                              (b) Using a service wire, connect PL+ and PL- of the connec-
P/T Squib (LH)           Sensor
                         Assembly                   tor (on the seat belt pretensioner side) between the seat
                                                    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 ).
                          DTC B0137/71        (c) Turn the ignition switch to LOCK, and wait at least for 20
        DLC3
                                                    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 ).
H01017
                                              OK:
H02139 AB0119
H10600 H01084                        H10631         DTC B0137/71 is not output.
                                              HINT:
                                              Codes other than code B0137/71 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 :              501
DI-332
                                          DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    4        Check P/T squib (LH).

                                              PREPARATION:
                                              (a) Turn 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 ON, and wait at least for 20 se-
                                                    conds.
                                              (b) Clear DTC stored in memory (See step 5 on page
                                                    DI-239 ).
         DLC3              DTC B0137/71       (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:
 AB0118 AB0119
 H10600 H01084                       H10632         DTC B0137/71 is not output.
                                              HINT:
                                              Codes other than code B0137/71 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 :             502



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