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DI-278
                                                 DIAGNOSTICS         -   SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                                            DI1B8-20




  DTC                B0107/51                         Short in P Squib Circuit (to Ground)

CIRCUIT DESCRIPTION
The P squib circuit consists of the airbag sensor assembly and front passenger airbag assembly.
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 B0107/51 is recorded when ground short is detected in the P squib circuit.
    DTC No.                      DTC Detecting Condition                                             Trouble Area
               S Short circuit in P squib wire harness (to ground)            S Front passenger airbag assembly (P squib)
    B0107/51   S P squib malfunction                                          S Airbag sensor assembly
               S Airbag sensor assembly malfunction                           S Wire harness


WIRING DIAGRAM
See page DI-271 .

INSPECTION PROCEDURE

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




   2     Check P squib circuit.

                                                       CHECK:
  P Squib                                              For the connector (on the front passenger airbag assembly
                           Airbag                      side) between the front passenger airbag assembly and the air-
                           Sensor                      bag sensor assembly, measure the resistance between P+ and
                           Assembly
                                                       body ground.
                                                       OK:
                                                             Resistance: 1 M or Higher


                                   P+


                     (-)     (+)

H01227
                                                           NG            Repair or replace harness or connector be-
H02145                                       H02254                      tween front passenger airbag assembly and air-
                                                                         bag sensor assembly.


   OK




2002 ECHO (RM884U)

                                                                                Author :                   Date :             448
                                                                                                      DI-279
                                         DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



  3        Check airbag sensor assembly.

                                              PREPARATION:
                                              (a) Connect the connector to the airbag sensor assembly.
                                              (b) Using a service wire, connect P+ and P- of the connector
  P Squib             Airbag                        (on the front passenger airbag assembly side) between
                      Sensor
                                                    the front passenger airbag assembly and the airbag sen-
                      Assembly
                                                    sor assembly.
                                              (c) Connect negative (-) terminal cable to the battery, and
                      
                                                    wait at least for 2 seconds.
                            ON                CHECK:
  P-             P+                           (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
                         Code B0107/51              DI-239 ).
       DLC3
                                              (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
H01023                                        (e) Check DTC (See page DI-239 ).
H02144 AB0118
H10600 H01075                        H10615   OK:
                                                    DTC B0107/51 is not output.
                                              HINT:
                                              Codes other than code B0107/51 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 :              449
DI-280
                                         DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



   4       Check P squib.

                                             PREPARATION:
  P Squib                                    (a) Turn the ignition switch to LOCK.
                       Airbag                (b) Disconnect negative (-) terminal cable from the battery,
                       Sensor                      and wait at least for 90 seconds.
                       Assembly
                                             (c) Connect the front passenger airbag assembly 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
                          DTC B0107/51
                                                   DI-239 ).
         DLC3                                (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 ).
 H01024                                      OK:
 AB0119
 H10600 H01075                      H10616         DTC B0107/51 is not output.
                                             HINT:
                                             Codes other than code B0107/51 may be output at this time, but
                                             they are not relevant to this check.

                                               NG          Replace front passenger airbag 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. 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 :             450



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