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                                                                                                                            DI-393
                                             DIAGNOSTICS            -       SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                                             DI5RJ-21




 SRS Warning Light Circuit Malfunction

CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from the LOCK position to ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminals Tc and CG of the DLC3 are connected, the DTC is displayed by blinking the SRS warning
light.

WIRING DIAGRAM

                                                                                                                   Airbag Sensor
                  C13                                                                                              Assembly
                  SRS Warning Light                                  Instrument Panel J/B
                   12         14                                        7               8                    3
                                             B-Y                                                B-Y (W)
                  C13        C13                                        1G             1D                   C4     LA

                                                                             8   1P
     B-R
            Instrument Panel J/B
               8           6                                                           B-Y
                                                   B-R
              1G          1O




                                               I10                                            6
            Instrument Panel J/B               Ignition Switch                                A/B
               7           1
                                       W-R    5                         6
              1A          1O
                                                   AM2         IG2
                                                              ST2                            D1 DLC3

      W-R
                                                         F6 Fusible
              Engine Room R/B
                                                         Link Block
                      15A AM2                                60A MAIN
                                             B-L         2
              1                    1
                      2     1

                                                                                  Battery




                                                                                                                              H12378




 2002 ECHO (RM884U)

                                                                                  Author :                Date :             563
DI-394
                                            DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM

INSPECTION PROCEDURE
Always lights up, when ignition switch is in LOCK position

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




   2        Does SRS warning light turn off?

 LOCK              Airbag Sensor Assembly       PREPARATION:
                                                (a) Turn the ignition switch to LOCK.
                                                (b) Disconnect negative (-) terminal cable from the battery,
                                                    and wait at least for 90 seconds.
                                                (c) Disconnect the airbag sensor assembly connector.
                                                (d) Connect negative (-) terminal cable to the battery.
                                                CHECK:
                                                Check operation of SRS warning light.
 AB0117   H01293                       H01295

                                                  NO          Check SRS warning light circuit or terminal A/B
                                                              circuit of DLC3.


  YES



  Replace airbag sensor assembly.




2002 ECHO (RM884U)

                                                                     Author :           Date :           564
                                                                                                   DI-395
                                        DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM

Does not light up, when ignition switch is turned to ON

   1      Check AM2 Fuse.

                                            PREPARATION:
                            Fuse
                                            Remove AM2 fuse.
                                            CHECK:
                                            Check continuity of AM2 fuse.
                                            OK:
                                                  Continuity
                                            HINT:
                                             S    Fuse may be burnt out even if it appears to be OK during
                                   N14677         visual inspection.
                                             S    If fuse is OK, install it.

                                              NG          Go to step 5.


  OK



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




   3      Check SRS warning light circuit.

                 Airbag Sensor Assembly     PREPARATION:
          ON                                (a) Connect negative (-) terminal cable to the battery.
                                            (b) Turn the ignition switch to ON.
                                            CHECK:
                (+)                LA       Measure the voltage between body ground and LA terminal of
                                            the harness side connector of the airbag sensor assembly.
                (-)                         OK:
                                                 Voltage: 10 - 14 V
 AB0119
 H01300                            H01301



                                               NG         Check SRS warning light bulb or repair SRS
                                                          warning light circuit.


  OK




2002 ECHO (RM884U)

                                                                Author :           Date :           565
DI-396
                                     DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



   4       Does SRS warning light come on?

                                           PREPARATION:
   P/T Squib (RH)                          (a) Disconnect negative (-) terminal cable from the battery.
                                           (b) Connect the airbag sensor assembly connector.
                                           (c) Connect negative (-) terminal cable to the battery, and
   Front Airbag                                wait at least for 2 seconds.
   Sensor (RH)
                                           (d) Turn ignition switch to ON.
 D Squib                                   CHECK:
                Spiral
                Cable
                                           Check operation of SRS warning light.


  P Squib


   Front Airbag
   Sensor (LH)

  P/T Squib (LH)

           ON
                            Airbag
                            Sensor
                            Assembly




H05047
BE6653
H10589
                                  H13130




                                             NO        Check terminal LA of airbag sensor assembly.
                                                       If normal, replace airbag sensor assembly.


  YES



  From the results of the above inspection, the malfunctioning part can now be considered normal.
  To make sure of this, use simulation method to check.




2002 ECHO (RM884U)

                                                             Author :            Date :           566
                                                                                       DI-397
                                DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



  5     Is new AM2 fuse burnt out again?


                                      NO          Using simulation method, reproduce malfunc-
                                                  tion symptoms. (See page IN-19 )


 YES



 Check harness between AM2 fuse and SRS
 warning light.




2002 ECHO (RM884U)

                                                        Author :           Date :        567



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