LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2019 >> Sequoia SR5, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes (3 Of 3) & Symptom Tests >> Airbag System >> SRS Warning Light Remains ON [08/2017 - 08/2019] >> Procedure

SRS Warning Light Remains ON [08/2017 - 08/2019]: Procedure

  1. CHECK SRS WARNING LIGHT OPERATION 
    1. Turn the ignition switch to ON and check the SRS warning light condition.

      HINT: 

      The primary check is performed for approximately 6 seconds after the ignition switch is turned to ON.

      Result

      Result Proceed to
      After the primary check period, the SRS warning light remains on. A
      After the primary check period, the SRS warning light goes off and comes on again. B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK BATTERY 
    1. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      11 to 14 V

      HINT: 

      It may be possible to tell whether the battery is discharged by operating the horn.

      If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE OR RECHARGE BATTERY 

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTOR 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Check that the connector is properly connected to the airbag sensor assembly.

      OK

      The connector is properly connected.

      HINT: 

      If the connector is not properly connected, reconnect the connector and proceed to the next inspection.

    4. Disconnect the connector from the airbag sensor assembly.
    5. Check that the terminals of the connector are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - BATTERY AND BODY GROUND) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY771150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
    2. Turn the ignition switch to ON.
    3. Operate all components of the electrical systems (defogger, wipers, headlights, heater blower, etc.).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      H153-36 (IG2) - Body ground Ignition switch ON 8 to 16 V
    5. Turn the ignition switch off.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H153-33 (E1) - Body ground Always Below 1 Ω
      H153-32 (E2) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HARNESS AND CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK SRS WARNING LIGHT (SHORT TO GROUND) 
    1. Turn the ignition switch to ON and check the SRS warning light condition.

      OK

      After the primary check period, the SRS warning light turns off for approximately 10 seconds and then turns back on.

      HINT: 

      The primary check period is approximately 6 seconds after the ignition switch is turned to ON.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [08/2017 - 08/2019] 

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2017 - ] 

  6. CHECK CAN COMMUNICATION SYSTEM 
    1. Check if a CAN communication DTC is output.

      Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2017 - 08/2019]

      OK

      CAN communication system is functioning normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2017 - 08/2019] 

    Result: 

    NG 

    See step  7

  7. CHECK BATTERY 
    1. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      11 to 14 V

      HINT: 

      It may be possible to tell whether the battery is discharged by operating the horn.

      If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE OR RECHARGE BATTERY 

    Result: 

    OK 

    See step  8

  8. CHECK CONNECTOR 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Check that the connector is properly connected to the airbag sensor assembly.

      OK

      The connector is properly connected.

      HINT: 

      If the connector is not properly connected, reconnect the connector and proceed to the next inspection.

    4. Disconnect the connector from the airbag sensor assembly.
    5. Check that the terminals of the connector are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - BATTERY AND BODY GROUND) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY771150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
    2. Turn the ignition switch to ON.
    3. Operate all components of the electrical systems (defogger, wipers, headlights, heater blower, etc.).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      H153-36 (IG2) - Body ground Ignition switch ON 8 to 16 V
    5. Turn the ignition switch off.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H153-33 (E1) - Body ground Always Below 1 Ω
      H153-32 (E2) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HARNESS AND CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK CONNECTOR 
    1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    2. Check that the connector is properly connected to the combination meter assembly.

      OK

      The connector is properly connected.

      HINT: 

      If the connector is not properly connected, reconnect the connector and proceed to the next inspection.

    3. Disconnect the connector from the combination meter assembly.
    4. Check that the terminals of the connector are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY AND BODY GROUND) 
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      GTY744258Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H139-2 (IG+) - Body ground Ignition switch ON 11 to 14 V
      H139-1 (B) - Body ground Always 11 to 14 V
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H139-23 (EP) - Body ground Always Below 1 Ω
      H139-24 (ES) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. CHECK SRS WARNING LIGHT 
    1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    2. Connect the connector to the combination meter assembly.
    3. Connect the cable to the negative (-) battery terminal.
    4. Turn the ignition switch to ON and check the SRS warning light condition.

      OK

      After the primary check period, the SRS warning light turns off for approximately 10 seconds and then turns back on.

      HINT: 

      The primary check period is approximately 6 seconds after the ignition switch is turned to ON.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [08/2017 - 08/2019] 

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2017 - ] 

scientia non olet · About LEMON Manuals