Toyota Tundra Service Manual: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

  • Use the following procedures to troubleshoot the seat belt warning system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

INSPECT BATTERY VOLTAGE

Standard Voltage:

11 to 14 V

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

NEXT

3.

CHECK FOR DTC*

(a) Check for DTCs and make a note of any codes that are output.

(b) Clear the DTCs.

(c) Recheck for DTCs. Based on the DTCs output above, try to cause the output of the same CAN system DTC, airbag system DTC or occupant classification system DTC by simulating the symptoms indicated by the DTC.

Result

Proceed to

DTC output does not reoccur

A

CAN communication system DTC output reoccurs

B

Airbag system DTC output reoccurs

C

Occupant classification system DTC output reoccurs

D

B

GO TO CAN COMMUNICATION SYSTEM

C

GO TO AIRBAG SYSTEM

D

GO TO OCCUPANT CLASSIFICATION SYSTEM

A

4.

PROBLEM SYMPTOMS TABLE

(a) Refer to the problem symptoms table.

Click here

NEXT

5.

OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Operation check

Click here

(b) Data List / Active Test

Click here

(c) Terminals of ECU

Click here

NEXT

6.

REPAIR OR REPLACE

NEXT

7.

CONFIRMATION TEST

NEXT

END

    Front Passenger Side Seat Belt Warning Light Malfunction

    Operation Check

    See More:

    Toyota Tundra Service Manual > Can Communication System: Open in Bus 3 Main Bus Line
    DESCRIPTION There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 6 (CA3H) and 21 (CA3L) or 19 (CAYH) and 20 (CAYL) of the central gateway ECU (network gateway ECU) is 70 Ω or higher. Symptom Trouble Area Resistance between terminals 6 (CA3H) and 21 (CA ...

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