ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT REAR BODY TAIL GATE ASSEMBLY (a) Check that the clearance measurements of areas A to B are within the standard range. 
Standard measurement:
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Toyota Tundra Service Manual > Occupant Classification System: Front Occupant Classification Sensor RH Circuit Malfunction (B1781)
DESCRIPTION The front occupant detection sensor RH circuit consists of the occupant classification ECU and the front occupant detection sensor RH. DTC B1781 is set when a malfunction is detected in the front occupant detection sensor RH circuit. DTC Code DTC Detection Condition Trouble Area B1781 On ...
