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DI-398
                                      DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM
                                                                                                        DI1BQ-42




 Tc Terminal Circuit

CIRCUIT DESCRIPTION
By connecting terminals Tc and CG of the DLC3 the airbag sensor assembly is set in the DTC output mode.
The DTCs are displayed by blinking the SRS warning light.

WIRING DIAGRAM


                                                                                        Airbag Sensor
                                                                                        Assembly
         D1 DLC3
                                       Instrument Panel J/B
                                        3                 4                     19
                               P-B                                P-B (W)
                     Tc                1P                1D                     C4 Tc
                          13



                                       17                 2
                               W-B                               W-B
                     CG                1P                1O
                          4


                                                                         ID




                                                                                                        H10661




2002 ECHO (RM884U)

                                                              Author :            Date :                  568
                                                                                                     DI-399
                                         DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM

INSPECTION PROCEDURE
If the DTC is not displayed, do the following troubleshooting.

    1       Does SRS warning light light up for approx. 6 seconds?

                                              PREPARATION:
                                              Check operation of the SRS warning light after ignition switch
                 LOCK               ON        is turned from LOCK position to ON position.




 AB0117 AB0119
 H10589                              H13131




                                                NO         Check SRS warning light system.
                                                           (See page DI-393 )


  YES



    2       Check voltage between terminals Tc and CG of DLC3.

                                              PREPARATION:
          ON
                                              Turn ignition switch to ON.
                              CG              CHECK:
                                              Measure the voltage between terminals Tc and CG of DLC3.
                                              OK:
                                                    Voltage: 4 - 14 V
                               Tc
                  (-)   (+)

AB0119
H10688                               H10654

                                                OK         Go to step 4.


   NG




2002 ECHO (RM884U)

                                                                 Author :           Date :            569
DI-400
                                         DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM



    3      Check voltage between terminal Tc of DLC3 and body ground.

          ON                                 CHECK:
                                             Measure the voltage between terminal Tc of DLC3 and body
                                             ground.
                                             OK:
                                                  Voltage: 4 - 14 V
                               Tc
                 (-)    (+)

                                               OK          Check harness between terminal CG of DLC3
 AB0119
                                    H10656
                                                           and body ground.
 H10689




   NG



    4      Check airbag sensor assembly.

                                             PREPARATION:
  LOCK                              ON       (a) Turn ignition switch to LOCK.
                                             (b) Disconnect negative (-) terminal cable from the battery,
                                                  and wait at least for 90 seconds.
          Airbag Sensor Assembly             (c) Disconnect the airbag sensor assembly connector.
                                             (d) Insert service wire into terminal Tc from back side as
                                                  shown in the illustration.
                                             (e) Connect the airbag sensor assembly connector with ser-
                                                  vice wire.
                                             (f)  Connect negative (-) terminal cable to the battery.
                                             (g) Turn ignition switch to ON and wait at least for 20 se-
                                                  conds.
                              Tc
                                             (h) Connect service wire of terminal Tc to body ground.
 AB0117 AB0119
 H01302                             H12918   CHECK:
                                             Check operation of SRS warning light.
                                             OK:
                                                  SRS waning light comes on.
                                             NOTICE:
                                             Pay due attention to the terminal connecting position to
                                             avoid a malfunction.

                                               OK          Check harness between the airbag sensor as-
                                                           sembly and DLC3.


   NG



  Replace airbag sensor assembly.

2002 ECHO (RM884U)

                                                                 Author :            Date :         570
                                                                                                     DI-401
                                         DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM

If the DTC is displayed without a DTC check procedure, perform the following
troubleshooting.

   1     Check resistance between terminal Tc of airbag sensor assembly and body
         ground.

 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.
                                 Tc            (c) Disconnect the airbag sensor assembly connector.
                                               CHECK:
          (-)        (+)                       Check resistance between terminal Tc of the airbag sensor as-
                                               sembly connector and body ground.
AB0119
H01304                                H01305   OK:
                                                   Resistance: 1 M or Higher

                                                 NG        Repair or replace harness or connector.


  OK



 Replace airbag sensor assembly.




2002 ECHO (RM884U)

                                                                 Author :           Date :            571



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