Toyota Tundra Service Manual: Voice Guidance does not Function

PROCEDURE

1.	CHECK VOICE GUIDANCE SETTING

(a) Check that the voice guidance settings are not off.

OK:

Voice guidance settings are not off.

CHANGE VOICE GUIDANCE SETTINGS TO ON

2.	CHECK AUDIO FUNCTION

(a) Check that sound can be heard from a front speaker.

OK:

Sound can be heard.

Result

REPLACE NAVIGATION RECEIVER ASSEMBLY

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Toyota Tundra Service Manual > Occupant Classification System: Rear Occupant Classification Sensor RH Collision Detection (B1788)
DESCRIPTION DTC B1788 is set when the occupant classification ECU receives a collision detection signal, which is sent by the occupant detection sensor rear RH when an accident occurs. DTC B1788 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