Toyota Tundra Service Manual: System Description

Toyota Tundra Service Manual / Vehicle Interior / Door Lock / Key Reminder Warning System / System Description

SYSTEM DESCRIPTION

1. KEY REMINDER WARNING SYSTEM DESCRIPTION

(a) When the driver side door is opened with the ignition key in the ACC or LOCK position, this system causes a buzzer to sound in order to warn the driver that the ignition key has not been removed.

2. FUNCTION OF MAIN COMPONENT

Component	Function
Front Door Courtesy Switch LH	Detects front door status (open or closed) and outputs signal to main body ECU
Unlock Warning Switch	Detects if key is inserted into ignition key cylinder or not and outputs signal to main body ECU
Combination Meter	Receives buzzer request signal from main body ECU after main body ECU receives ignition switch signal and front door courtesy light switch signal, and actuates inner circuit to sound built-in buzzer intermittently

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Toyota Tundra Service Manual > Tire Pressure Warning System: Diagnosis System
DIAGNOSIS SYSTEM CHECK WARNING LIGHT NOTICE: When there is a problem with the tire pressure warning system, the tire pressure warning light blinks at 0.5 second intervals, and illuminates after 1 minute. When the malfunction has been corrected, the tire pressure warning light goes off. When the tire ...

Toyota Tundra Service Manual: System Description

Problem Symptoms Table

System Diagram

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