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DI-254
                                                  DIAGNOSTICS       -    SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                                           DI18Q-37


CIRCUIT INSPECTION

  DTC                    B0100/13                      Short in D Squib Circuit

CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each component, see OPERATION on page RS-2 .
DTC B0100/13 is recorded when a short is detected in the D squib circuit.
    DTC No.                        DTC Detecting Condition                                               Trouble Area
                  S Short circuit between D+ wire harness and D- wire har-
                                                                                 S Steering wheel pad (D squib)
                    ness of squib
                                                                                 S Spiral cable
    B0100/13      S D squib malfunction
                                                                                 S Airbag sensor assembly
                  S Spiral cable malfunction
                                                                                 S Wire harness
                  S Airbag sensor assembly malfunction


WIRING DIAGRAM



                                                                                               Airbag Sensor Assembly




               A11
               D Squib

                                                                                         14
                                                              1         Y-B (SB)
                                                                                         C4 D+



                                                                                         13
                                                              2         Y (SB)
                                                                                         C4 D-



                                                 Spiral
                                                 Cable




                                                                                                                            H01451




2002 ECHO (RM884U)

                                                                                   Author :                       Date :     424
                                                                                                          DI-255
                                              DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM

INSPECTION PROCEDURE

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




   2      Check D squib circuit.

                                                   PREPARATION:
                                                   Release the airbag activation prevention mechanism of the
           Spiral
                                   Airbag          connector (on the airbag sensor assembly side) between the
                                   Sensor
           Cable                                   airbag sensor assembly and the spiral cable.
                                   Assembly
D Squib                                            (See page DI-239 )
                                                   CHECK:
                                                   For the connector (on the spiral cable side) between the spiral
                                                   cable and the steering wheel pad, measure the resistance be-
                                                   tween D+ and D-.
             D-               D+                   OK:
                                                         Resistance: 1 M or Higher

                  (-)   (+)
H01001
H02142                                    H02193




                                                     NG         Go to step 5.


   OK




2002 ECHO (RM884U)

                                                                      Author :           Date :             425
DI-256
                                           DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    3        Check airbag sensor assembly.

                                               PREPARATION:
                                               (a) Connect the connector to the airbag sensor assembly.
                                               (b) Connect negative (-) terminal cable to the battery, and
                               Airbag
                   Spiral                            wait at least for 2 seconds.
                               Sensor
                   Cable                       CHECK:
                               Assembly
D Squib                                        (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 B0100/13       (e) Check DTC. (See page DI-239 )
                                               OK:
                                                     DTC B0100/13 is not output.
                                               HINT:
                                               Codes other than code B0100/13 may be output at this time, but
        CG         Tc
 H01002
                                               they are not relevant to this check.
 AB0119
 H10600   FI1390                      H10598

                                                 NG          Replace airbag sensor assembly.


   OK




2002 ECHO (RM884U)

                                                                   Author :            Date :             426
                                                                                                     DI-257
                                        DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



   4        Check D squib.

                                             PREPARATION:
                                             (a) Turn the ignition switch to LOCK.
       
                                             (b) Disconnect negative (-) terminal cable from the battery,
                Spiral       Airbag                and wait at least for 90 seconds.
                Cable        Sensor
                             Assembly        (c) Connect the steering wheel pad connector.
D Squib                                      (d) Connect negative (-) terminal cable to the battery, and
                                                   wait at least for 2 seconds.
                                             CHECK:
                ON
                                             (a) Turn the ignition switch to LOCK, and wait at least for 20
                                                   seconds.
                                             (b) Turn the ignition switch to ON, and wait at least for 20 se-
                         DTC B0100/13
                                                   conds.
       DLC3
                                             (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.
                                             (f)   Check DTC. (See page DI-239 )
H01003
AB0119
H10600 FI1390                       H10599   OK:
                                                   DTC B0100/13 is not output.
                                             HINT:
                                             Codes other than code B0100/13 may be output at this time, but
                                             they are not relevant to this check.

                                               NG         Replace steering wheel pad.


  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 :              427
DI-258
                                                   DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    5      Check spiral cable.

                                                        PREPARATION:
                                                        (a) Disconnect the connector between the airbag sensor as-
            Spiral
                                        Airbag                sembly and the spiral cable.
                                        Sensor          (b) Release the airbag activation prevention mechanism of
            Cable
                                        Assembly
 D Squib                                                      the spiral cable connector on the airbag sensor assembly
                                                              side. (See page DI-239 )
                                                        CHECK:
                                                        For the connector (on the spiral cable side) between the spiral
                                                        cable and the steering wheel pad, measure the resistance be-
              D-                   D+                   tween D+ and D-.
                                                        OK:
                                                              Resistance: 1 M or Higher
                    (-)      (+)
H01000
H02142                                         H02195



                                                          NG         Repair or replace spiral cable.


   OK



    6      Check harness between airbag sensor assembly and spiral cable.

                                                        PREPARATION:
                                                        Release the airbag activation prevention mechanism of the
                                                        connector (on the airbag sensor assembly side) between the
                                    Airbag              airbag sensor assembly and the spiral cable.
           Spiral                   Sensor
           Cable                    Assembly
                                                        (See page DI-239 )
                                                        CHECK:
D Squib
                                                        For the connector (on the spiral cable side) between the airbag
                                                        sensor assembly and the spiral cable, measure the resistance
                                                        between D+ and D-.
                                   D+                   OK:
                    D-
                                                              Resistance: 1 M or Higher

                      (-)     (+)
 H01004
 H02142                                        H10601     NG         Repair or replace harness or connector be-
                                                                     tween airbag sensor assembly and spiral cable.


   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 :             428



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