Toyota Tundra. Manual — part 345

Fig. 67: Identifying Key Reminder Warning System Components Location (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

Fig. 68: Identifying Key Reminder Warning System Components Location (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

SYSTEM DIAGRAM

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

Fig. 69: Key Reminder Warning System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Communication table:

COMMUNICATION TABLE

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

FUNCTION OF MAIN COMPONENT

Sender

Receiver

Signal

Line

Main Body ECU

Combination Meter

Front Door Courtesy Light Switch

CAN

Main Body ECU

Combination Meter

Unlock Warning Switch

CAN

Component

Function

Front Door

Courtesy Switch

LH

Detects front door status (open or closed) and outputs signal to main body ECU

Unlock Warning Detects if key is inserted into ignition key cylinder or not and outputs signal to main

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:



Use the following procedures to troubleshoot the key reminder warning system.



*: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP

2. INSPECT BATTERY VOLTAGE

a. Measure the battery voltage

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

3. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

a. Use the Techstream to check if the CAN communication system is functioning normally.

Result

COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM RESULT
REFERENCE

B: Go to CAN COMMUNICATION (See COMBINATION METER ECU COMMUNICATION
STOP MODE )

A: Go to next step

4. PROBLEM SYMPTOMS TABLE

Result

PROBLEM SYMPTOMS RESULT REFERENCE

Switch

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

Result

Proceed to

CAN DTC is not output

A

CAN DTC is output

B

Result

proceed to

Fault is not listed in problem symptoms table

A

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra