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                                                                                                                       DI-271
                                                 DIAGNOSTICS    -   SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                                        DI1B6-38




  DTC                B0105/53                            Short in P Squib Circuit

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 B0105/53 is recorded when a short is detected in the P squib circuit.
    DTC No.                      DTC Detecting Condition                                        Trouble Area
               S Short circuit in P squib wire harness                   S Front passenger airbag assembly (P squib)
   B0105/53    S P squib malfunction                                     S Airbag sensor assembly
               S Airbag sensor assembly malfunction                      S Wire harness


WIRING DIAGRAM



                                                                                       Airbag Sensor Assembly




                     A10
                     P Squib

                                                                                 10
                                             1             Y-R (SB)
                                                                                 C4 P+



                                                                                 11
                                             2             Y-G (SB)
                                                                                 C4 P-




                                                                                                                        H01454




2002 ECHO (RM884U)

                                                                          Author :                   Date :             441
DI-272
                                          DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM

INSPECTION PROCEDURE

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




    2     Check P squib circuit.

                                                PREPARATION:
                                                Release the airbag activation prevention mechanism of the
  P Squib                                       connector (on the airbag sensor assembly side) between the
                            Airbag
                            Sensor              front passenger airbag assembly and the airbag sensor assem-
                            Assembly            bly. (See page DI-239 )
                                                CHECK:
                                                For the connector (on the front passenger airbag assembly
                                                side) between the front passenger airbag assembly and the air-
                                                bag sensor assembly, measure the resistance between P+ and
                     P-         P+              P-.
                                                OK:
                                                       Resistance: 1 M or Higher
                      (-)     (+)
 R14286
 H02142                                H02251




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


   OK




2002 ECHO (RM884U)

                                                                   Author :           Date :             442
                                                                                                         DI-273
                                             DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



   3        Check airbag sensor assembly.

                                                 PREPARATION:
 P Squib                                         (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 B0105/53
                                                 (e) Check DTC. (See page DI-239 )
                                                 OK:
                                                       DTC B0105/53 is not output.
                                                 HINT:
       CG         Tc                             Codes other than code B0105/53 may be output at this time, but
H01023                                           they are not relevant to this check.
AB0119
H10600   H01077                         H10611

                                                    NG         Replace airbag sensor assembly.


  OK




2002 ECHO (RM884U)

                                                                     Author :           Date :             443
DI-274
                                             DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    4        Check P squib.

                                                 PREPARATION:
                                                 (a) Turn the ignition switch to LOCK.
    P Squib                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 LOOK, and wait at least for 20
                                                       seconds.
                                                 (b) Turn the ignition switch to ON, and wait at least for 20 se-
                                                       conds.
         DLC3                 DTC B0105/53       (c) Clear DTC stored in memory. (See page DI-239 )
                                                 (d) Turn the ignition switch to LOCK, and wait at least for 20
                                                       seconds.
                                                 (e) Turn the ignition switch to ON, and wait at least for 20 se-
        CG       Tc                                    conds.
 H01024                                          (f)   Check DTC. (See page DI-239 )
 AB0119
 H10600 H01077                          H10612   OK:
                                                       DTC B0105/53 is not output.
                                                 HINT:
                                                 Codes other than code B0105/53 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.




2002 ECHO (RM884U)

                                                                     Author :            Date :             444



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