Toyota Tundra Service Manual: Operation Check

OPERATION CHECK

PRECAUTION FOR OPERATION CHECK

CAUTION:

Use the correct procedure to replace the airbag parts.

CHECK SRS WARNING LIGHT

(a) Primary check

(1) Turn the ignition switch to ON and check that the SRS warning light turn on.

(2) Turn the ignition switch off. Wait for at least 2 seconds, and then turn the ignition switch to ON. The SRS warning light comes on for approximately 6 seconds and diagnosis of the airbag system (including the seat belt pretensioners) is performed.

NOTICE:

Turn the ignition switch off when the battery is connected.

HINT:

  • If the warning light remains on for approximately 6 seconds or more after the ignition switch has been turned to ON, there may be a malfunction with the SRS airbag system.
  • If the warning light occasionally turns on approximately 6 seconds or more after the ignition switch has been turned to ON, there may be a short to +B, short to ground or an open in the SRS warning light circuit.
  • If the warning light illuminates after turning the ignition switch off or on (ACC), there may be a malfunction in the power source circuit or combination meter assembly.
  • The SRS warning light turns off, and then turns on. This blinking pattern indicates a source voltage drop. The SRS warning light turns off 10 seconds after the source voltage returns to normal.

FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR

(a) Initial check

(1) Turn the ignition switch to ON.

(2) The passenger airbag ON/OFF indicator comes on for approximately 4 seconds, and then goes off for approximately 2 seconds.

(3) Approximately 6 seconds after the ignition switch is turned to ON, the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the following conditions.

Indicator Operation

Front Passenger Seat Condition

Passenger Airbag ON/OFF Indicator

SRS Warning Light

ON Indicator

OFF Indicator

Vacant

Off

On

Off

Adult*1 is seated

On

Off

Off

Child*2 is seated

On or Off*2

Off or On*2

Off

Child restraint system is installed

Off

On

Off

Occupant classification system failure

Off

On

On

  • *1: The system judges a person of average adult weight or more as an adult. If a smaller adult sits in the front passenger seat, the system may not recognize them as an adult depending on their physique and posture.
  • *2: The system may not recognize a child or a child in a child restrain system as a child depending on factors such as the positioning of the child restraint system or the child's physique or posture.

HINT:

  • The timing chart below shows the operation of the passenger airbag ON/OFF indicator. Use the chart to check the indicator light circuit.
  • When the occupant classification system has trouble, both the SRS warning light and passenger airbag ON/OFF indicator ("OFF") come on. In this case, check for DTCs for "Airbag System" first. Then troubleshoot the occupant classification system if DTC B1650 is output, and troubleshoot the passenger airbag ON/OFF indicator if DTC B1660 is output.

CHECK PASSENGER AIRBAG ON/OFF INDICATOR

(a) Turn the ignition switch to ON.

(b) Check that the passenger airbag ON/OFF indicator ("ON" and "OFF") comes on for approximately 4 seconds, and then goes off for approximately 2 seconds.

HINT:

In order to check the operation of the passenger airbag ON/OFF indicator when approximately 6 seconds have elapsed after turning the ignition switch to ON, refer to the table in the previous step.

CHECK HORN BUTTON ASSEMBLY

Click here

CHECK INSTRUMENT PANEL PASSENGER WITHOUT DOOR AIRBAG ASSEMBLY

Click here

CHECK FRONT SEAT AIRBAG ASSEMBLY

for Manual Seat:

Click here

for Power Seat:

Click here

CHECK CURTAIN SHIELD AIRBAG ASSEMBLY

for Double Cab:

Click here

for CrewMax:

Click here

CHECK LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

Click here

CHECK LOWER NO. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY

Click here

CHECK FRONT SEAT OUTER BELT ASSEMBLY (for Vehicle not Involved in Collision)

(a) Perform a diagnostic system check.

Click here

(b) Visually check for defects with the front seat outer belt assembly installed to the vehicle.

(1) The defects to be checked are as follows:

  • Cuts on the front seat outer belt assembly
  • Small cracks on the front seat outer belt assembly
  • Significant discoloration on the front seat outer belt assembly

OK:

No defects are found.

HINT:

If any defects are found, replace the front seat outer belt assembly with a new one.

CHECK FRONT SEAT OUTER BELT ASSEMBLY (for Vehicle Involved in Collision)

(a) Perform a diagnostic system check.

Click here

(b) Visually check for defects with the front seat outer belt assembly removed from the vehicle.

(1) The defects to be checked are as follows:

  • Cuts on the front seat outer belt assembly
  • Small cracks on the front seat outer belt assembly
  • Significant discoloration on the front seat outer belt assembly
  • Cracks or other damage on the connector

OK:

No defects are found.

HINT:

If any defects are found, replace the front seat outer belt assembly with a new one.

CHECK FRONT AIRBAG SENSOR

Click here

CHECK NO.2 SIDE AIRBAG SENSOR ASSEMBLY

for Double Cab:

Click here

for CrewMax:

Click here

CHECK SIDE AIRBAG SENSOR ASSEMBLY (for Vehicle not Involved in Collision)

(a) Perform a diagnostic system check.

Click here

CHECK SIDE AIRBAG SENSOR ASSEMBLY (Vehicle Involved in Collision and Airbag not Deployed)

(a) Perform a diagnostic system check.

Click here

(b) Visually check the side airbag sensor assemblies for defects if a front quarter trim panel assembly of the vehicle or the area around a front quarter trim panel assembly is damaged.

(1) The defects are as follows:

  • Cracks on the sensor housing
  • Dents on the sensor housing
  • Chips on the sensor housing
  • Cracks or other damage to the connector
  • Damage to the serial number

OK:

No defects are found.

HINT:

If any of the defects is found, replace the side airbag sensor assembly with a new one.

CHECK SIDE AIRBAG SENSOR ASSEMBLY (Vehicle Involved in Collision and Airbag is Deployed)

(a) When airbags have deployed as the result of a collision, be sure to replace all side airbag sensor assemblies in the damaged areas (anywhere in need of repair).

(b) Visually check the side airbag sensor assemblies in undamaged areas for defects.

(1) The defects are as follows:

  • Cracks on the sensor housing
  • Dents on the sensor housing
  • Chips on the sensor housing
  • Cracks or other damage to the connector
  • Damage to the serial number

OK:

No defects are found.

HINT:

If any of the defects is found or a side airbag sensor assemblies has detected a major collision, replace the side airbag sensor assembly with a new one.

CHECK SEAT POSITION AIRBAG SENSOR

Click here

CHECK AIRBAG SENSOR ASSEMBLY

for Column Shift Type:

Click here

for Floor Shift Type:

Click here

CHECK HARNESS AND CONNECTOR

(a) for Vehicle not Involved in Collision

(1) Perform a diagnostic system check.

(b) for Vehicle Involved in Collision and Airbag not Deployed

(1) Perform a diagnostic system check.

(c) for Vehicle Involved in Collision and Airbag is Deployed

(1) Perform a diagnostic system check.

(2) Check any of the wire harnesses in exposed contact with the airbag wire harness for damage.

(3) Check the connector of the airbag wire harness for scratches, cracks or damage.

    How To Proceed With Troubleshooting

    Parts Location

    See More:

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