CHECK FOR INTERMITTENT PROBLEMS HINT: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.
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Toyota Tundra Service Manual > Seat Belt Warning System: Front Passenger Side Seat Belt Warning Light Malfunction
DESCRIPTION When the ignition switch to ON, the occupant detection ECU sends a signal to the center airbag sensor assembly to indicate the state of the front seat inner belt assembly RH and also whether the front passenger seat is occupied. The center airbag sensor assembly sends those signals to th ...