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DTC B1859: SW Fail: Diagnosis

Required Special Tools 

  1. STEP 1. Using scan tool (M.U.T.-IIISE), check the data list. 

    Check the TCU data list (Refer to DATA LIST REFERENCE TABLE  ).

    CAUTION: To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
    1. Connect scan tool (M.U.T.-IIISE). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) ."
    Item No. Check condition Normal condition
    1
    • Ignition switch: ON
    • SOS switch/information switch: Non-operation
    		 No switch press

    Q: Is the check result normal? 

    YES:  Go to Step  4.

    NO:  Go to Step  2.

  2. STEP 2. Check the SOS switch/information switch. 

    Check the resistance the SOS switch/information switch during operation/non-operation. Refer to ECALL & BCALL SWITCH  .

    Q: Is the check result normal? 

    YES:  Go to Step  3.

    NO:  Replace the ECALL & BCALL switch (Refer to ECALL & BCALL SWITCH  ).

  3. STEP 3. Resistance measurement at the ECALL & BCALL switch connector (terminals No. 11, 13). 
    1. Disconnect the ECALL & BCALL switch connector, and measure at the wiring harness side.
    2. Check the resistance between the ECALL & BCALL switch connector (terminal No. 11) and body ground.

      OK: No continuity 

    3. Check the resistance between the ECALL & BCALL switch connector (terminal No. 13) and body ground.

      OK: No continuity 

      Q: Is the check result normal? 

      YES:  Go to Step  6.

      NO:  Repair the connector(s) or wiring harness.

  4. STEP 4. Check the SOS switch/information switch indicator light. 

    Check that the SOS switch/information switch indicator light illuminates. Refer to ECALL & BCALL SWITCH  .

    Q: Is the check result normal? 

    YES:  Go to Step  5.

    NO:  Replace the ECALL & BCALL switch (Refer to ECALL & BCALL SWITCH  ).

  5. STEP 5. Resistance measurement at between the TCU connector (ID1+, ID4+, ID5+, ID6+ terminals). 
    1. Disconnect the TCU connector and ECALL & BCALL switch connector, and measure at the wiring harness side.
    2. Check the resistance between the TCU connector (ID1+, ID4+, ID5+, ID6+ terminals) and body ground.

      OK: No continuity 

    3. Check the continuity between the following terminals.
      • Check the resistance between the TCU connector (ID1+ terminal) and the ECALL & BCALL switch connector (except terminal No. 4).
      • Check the resistance between the TCU connector (ID4+ terminal) and the ECALL & BCALL switch connector (except terminal No. 5).
      • Check the resistance between the TCU connector (ID5+ terminal) and the ECALL & BCALL switch connector (except terminal No. 15).
      • Check the resistance between the TCU connector (ID6+ terminal) and the ECALL & BCALL switch connector (except terminal No. 16).

      OK: No continuity 

      Q: Is the check result normal? 

      YES:  Go to Step  6.

      NO:  Repair the connector(s) or wiring harness.

  6. STEP 6. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again. 

    Check again if the DTC is set in the TCU.

    1. Erase the DTC.
    2. Turn the ignition switch from OFF position to ON position.
    3. Check the DTC.

      Q: Is the DTC set? 

      YES:  Replace the TCU (Refer to TCU  ).

      NO:  The trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).

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