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                                                                                                                     DI-267
                                                    DIAGNOSTICS      -   SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                                      DI4L3-12




  DTC                    B0103/12                         Short in D Squib Circuit (to B+)

CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
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 B0103/12 is recorded when a B+ short is detected in the D squib circuit.
     DTC No.                         DTC Detecting Condition                                          Trouble Area
                   S Short circuit in D squib wire harness (to B+)            S Steering wheel pad (D squib)
                   S D squib malfunction                                      S Spiral cable
    B0103/12
                   S Spiral cable malfunction                                 S Airbag sensor assembly
                   S Airbag sensor assembly malfunction                       S Wire harness


WIRING DIAGRAM
See page DI-254 .

INSPECTION PROCEDURE

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




    2      Check D squib circuit.

                                                           CHECK:
                                                           (a) Turn the ignition switch to ON.
 D Squib
                                        Airbag             (b) For the connector (on the spiral cable side) between the
               Spiral                   Sensor                 spiral cable and the steering wheel pad, measure the volt-
               Cable                    Assembly               age between D+ and body ground.
                                                           OK:
                                                               Voltage: 0 V

          ON
                                   D+



                   (-)       (+)
 H01001
 AB0119                                                        NG        Go to step 5.
 H02146                                          H04689




   OK




2002 ECHO (RM884U)

                                                                               Author :                    Date :     437
DI-268
                                           DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    3       Check airbag sensor assembly.

                                                 PREPARATION:
 D Squib                                         (a) Connect the connector to the airbag sensor assembly.
                             Airbag
                 Spiral      Sensor              (b) Using a service wire, connect D+ and D- of the connector
                 Cable       Assembly                  (on the spiral cable side) between the spiral cable and the
                                                       steering wheel pad.
                                                 (c) 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-
   D-                D+
                                                       conds.
                                                 (b) Clear DTC stored in memory (See step 5 on page
                                                       DI-239 ).
         DLC3             DTC B0103/12           (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.
                                                 (e) Check DTC (See page DI-239 ).
     CG         Tc                               OK:
H01002
H02144 AB0119
H10600 W02043                           H10608         DTC B0103/12 is not output.
                                                 HINT:
                                                 Codes other than code B0103/12 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 :              438
                                                                                                       DI-269
                                         DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



   4      Check D squib.

                                               PREPARATION:
                                               (a) Turn the ignition switch to LOCK.
                                               (b) Disconnect negative (-) terminal cable from the battery,
                           Airbag
            Spiral                                   and wait at least for 90 seconds.
                           Sensor
            Cable          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 ON, and wait at least for 20 se-
                                                     conds.
                                               (b) Clear DTC stored in memory (See step 5 on page
                                                     DI-239 ).
                       DTC B0103/12            (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 ).
H01003
                                               OK:
AB0019
H10600 W02043                         H10609         DTC B0103/12 is not output.
                                               HINT:
                                               Codes other than code B0103/12 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. 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 :              439
DI-270
                                                         DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    5      Check spiral cable.

                                                               PREPARATION:
                                                               (a) Turn ignition switch to LOCK.
               Spiral
                                           Airbag              (b) Disconnect the connector between the airbag sensor as-
                                           Sensor
               Cable                                               sembly and the spiral cable.
                                           Assembly
 D Squib                                                       CHECK:
                                                               (a) Turn the ignition switch to ON.
                                                               (b) For the connector (on the spiral cable side) between the
                                                  ON
                                                                   spiral cable and the steering wheel pad, measure the volt-
                                                                   age between D+ and body ground.
                                D+
                                                               OK:
                                                                   Voltage: 0 V
                 (-)          (+)
H01000
AB0119
                                                      H02202
                                                                 NG        Repair or replace spiral cable.
H02146




   OK




    6      Check harness between airbag sensor assembly and spiral cable.

          ON                                                   CHECK:
                                                               (a) Turn the ignition switch to ON.
                                                               (b) For the connector (on the spiral cable side) between the
               Spiral                       Airbag                 spiral cable and airbag sensor assembly, measure the
                                            Sensor
               Cable                        Assembly
                                                                   voltage between D+ and body ground.
 D Squib                                                       OK:
                                                                   Voltage: 0 V



                                      D+


                        (-)         (+)
 AB0119
 H01004
 H02146                                               H10610




                                                                 NG        Repair or replace harness between airbag sen-
                                                                           sor 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. 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 :             440



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