HOW TO PROCEED WITH TROUBLESHOOTING HINT: This is a flowchart for vehicle pull. 
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Toyota Tundra Service Manual > Airbag System: Seat Position Airbag Sensor Circuit Malfunction (B1653)
DESCRIPTION The seat position airbag sensor circuit consists of the airbag sensor assembly and seat position airbag sensor. DTC B1653 is stored when a malfunction is detected in the seat position airbag sensor circuit. DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test ...
