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DI-314
                                                 DIAGNOSTICS       -   SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                                      DI1BG-26




  DTC                  B0131/64                       Open in P/T Squib (RH) Circuit

CIRCUIT DESCRIPTION
The P/T squib circuit (RH) consists of the airbag sensor assembly and seat belt pretensioner (RH).
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 B0131/64 is recorded when an open is detected in the P/T squib (RH) circuit.
    DTC No.                       DTC Detecting Condition                                             Trouble Area
                 S Open circuit in PR+ wire harness or PR- wire harness of
                                                                             S Seat belt pretensioner (RH)
                   squib
    B0131/64                                                                 S Airbag sensor assembly
                 S P/T squib (RH) malfunction
                                                                             S Wire harness
                 S Airbag sensor assembly malfunction


WIRING DIAGRAM
See page DI-310 .

INSPECTION PROCEDURE

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




   2     Check P/T squib (RH) circuit.

                                                       CHECK:
                                                       For the connector (on the seat belt pretensioner side) between
                         Airbag
                                                       the seat belt pretensioner (RH) and the airbag sensor assem-
  P/T Squib (RH)         Sensor
                         Assembly                      bly, measure the resistance between PR+ and PR-.
                                                       OK:
                                                             Resistance: Below 1 

               PR+          PR-




                 (+)       (-)
H01019
H02141                                       H02205         NG         Repair or replace harness or connector be-
                                                                       tween seat belt pretensioner (RH) and airbag
                                                                       sensor assembly.


   OK



2002 ECHO (RM884U)

                                                                               Author :                      Date :     484
                                                                                                      DI-315
                                         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 PR+ and PR- of the con-
 P/T Squib (RH)        Sensor                       nector (on the seat belt pretensioner side) between the
                       Assembly
                                                    seat belt pretensioner (RH) and the airbag sensor assem-
                                                    bly.
                       
                                              (c) Connect negative (-) terminal cable to the battery, and
                                                    wait at least for 2 seconds.
  PR+            PR-
                              ON              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 )
                                              (c) Turn the ignition switch to LOCK, and wait at least for 20
        DLC3              DTC B0131/64              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
H01020
                                              OK:
H02139 AB0119
H10600 H01083                        H10621         DTC B0131/64 is not output.
                                              HINT:
                                              Codes other than code B0131/64 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 :              485
DI-316
                                            DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    4       Check P/T squib (RH).

                                                 PREPARATION:
                                                 (a) Turn the ignition switch to LOCK.
                                                 (b) Disconnect negative (-) terminal cable from the battery,
                           Airbag
                           Sensor
                                                       and wait at least for 90 seconds.
P/T Squib (RH)
                           Assembly              (c) Connect the seat belt pretensioner (RH) 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 page DI-239 )
                                                 (c) Turn the ignition switch to LOCK, and wait at least for 20
         DLC3                DTC B0131/64              seconds.
                                                 (d) Turn the ignition switch to ON, and wait at least for 20 se-
                                                       conds.
                                                 (e) Check DTC. (See page DI-239 )
                                                 OK:
     CG          Tc
 H01021
                                                       DTC B0131/64 is not output.
 AB0119
 H10600 H01083                          H10622   HINT:
                                                 Codes other than code B0131/64 may be output at this time, but
                                                 they are not relevant to this check.

                                                   NG         Replace seat belt pretensioner (RH).


   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 :              486



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