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
    Problem Symptoms Table

    System Diagram

    See More:

    Toyota Tundra Service Manual > Front Seat Assembly(for Power Seat): Removal
    REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH and LH sides. The procedure listed below is for the LH side. PROCEDURE 1. PRECAUTION NOTICE: After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2026 Copyright www.ttundra.com
    0.0122