Toyota Tundra Service Manual: Check Mode Procedure

CHECK MODE PROCEDURE

CHECK MODE (SIGNAL CHECK): DTC CHECK

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Select "Signal Check" and proceed with checking using the Techstream.

NOTICE:

Select Signal Check on the Techstream to clear the DTCs (both current and history).

HINT:

DTCs can be detected more sensitively in check mode than in normal diagnosis mode.
Perform check mode inspection when a malfunction in a squib circuit is suspected even after the normal system code is output through normal diagnosis mode inspection.

Toyota Tundra Service Manual > Occupant Classification System: Rear Occupant Classification Sensor LH Collision Detection (B1787)
DESCRIPTION DTC B1787 is set when the occupant classification ECU receives a collision detection signal, which is sent by the rear occupant detection sensor LH when an accident occurs. DTC B1787 is also set when the front seat frame with adjuster RH is subjected to a strong impact, even if an actual ...

Toyota Tundra Owners Manual