Toyota Tundra. Manual — part 2472

Fig. 11: Lighting System Diagram (3 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Communication table

COMMUNICATION CHART

Sender

Receiver

Signal

Line

ECM

Main Body ECU

Vehicle speed signal

CAN



Headlight Lo beam signal

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

SYSTEM DESCRIPTION

1. ILLUMINATED ENTRY SYSTEM

a. When the doors are unlocked by a key or door control transmitter operation, or when a door is

opened or closed, the illuminated entry system turns on the room light, map light, foot light and
ignition key cylinder light.

1. The main body ECU receives the following signals (A).



Door control switch signal



Door detection switch signal



Ignition switch signal

2. The main body ECU controls the following signal based on the signals listed in A.



Illumination operation signal

3. The main body ECU controls the on/off and fade-in/fade-out operation of the following parts.



Room light



Map light



Foot light



Ignition key cylinder light

2. BATTERY SAVE SYSTEM

a. When the ignition switch is turned OFF and any of the doors is open continuously for 20 minutes,

the main body ECU turns the illumination operation signal off. As a result, the room light, map
light, foot light and ignition key cylinder light turn off.

1. The main body ECU receives the following signals (B).



Door courtesy light switch signal



Ignition switch signal

2. The main body ECU controls the following signal based on the signal listed in B (C).



Illumination operation signal

3. The main body ECU controls the illumination period of the following parts based on the

signal listed in C.



Room light



Map light



Foot light



Ignition key cylinder light

Main Body ECU

Combination Meter



Headlight Hi beam signal



Taillight signal



Front door courtesy light switch LH signal



Front door courtesy light switch RH signal



Rear door courtesy light switch LH signal



Rear door courtesy light switch RH signal

CAN

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra



Cargo light

3. MANUAL LIGHT CONTROL SYSTEM

a. This system functions when lights such as the headlight, taillight and front fog light are illuminated

by manual operation of the light control switch.

1. The main body ECU receives the following signals (D).



Light control switch signal



Headlight dimmer switch signal



Front fog light switch signal

2. The main body ECU controls the following signals based on the signals listed in D (E).



Headlight relay operation signal



Taillight relay operation signal



Front fog light relay operation signal

3. The main body ECU controls the on/off operation of the following parts based on the signal

listed in E.



Headlight (Low)



Headlight (High)



Front fog light

4. LIGHT AUTO TURN OFF SYSTEM

a. When the headlight and taillight are both illuminated by the operation of the light control switch, if

the ignition switch is turned OFF, this system continues illuminating the headlight and taillight for
approximately 30 seconds, and then turns them off. However, when all the doors are locked using
the door control switch, key or transmitter OFF switch within 30 seconds, this system turns the
headlight and taillight off immediately. Also, when only the taillight is illuminated by the operation
of the light control switch, if the ignition switch is turned OFF and the driver door is opened, this
system turns the taillight off immediately.

1. The main body ECU receives the following signals (F).



Door courtesy light switch signal



Ignition switch signal

2. The main body ECU controls the following signals based on the signals listed in F (G).



Headlight relay operation signal



Taillight relay operation signal



Daytime running light relay operation signal

3. The main body ECU controls the on/off operation of the following parts based on the signal

listed in G.



Headlight (Low)



Headlight (High)



Taillight

5. DAYTIME RUNNING LIGHT SYSTEM

a. This system is directly connected to the turn signal light and is designed to automatically activate

the daytime running lights in order to increase the visibility of the vehicle.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

1. The main body ECU receives the following (H).



Ignition switch signal



Engine speed signal



Parking brake switch signal



Light control switch signal

2. The main body ECU and turn signal flasher controls the following signal based on the signals

listed in H (I).



Daytime running light relay operation signal

3. The main body ECU and turn signal flasher controls the on/off operation of the following

part based on the signal listed in I.



Turn signal light

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:



Use these procedures to troubleshoot the lighting system.



*: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP

2. INSPECT BATTERY VOLTAGE

Standard voltage:

11 to 14 V

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

3. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

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

Result

COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM

B: Go TO CAN COMMUNICATION SYSTEM

A: Go to next step

4. CHECK FOR DTC*

Result

Proceed to

CAN DTC is not output

A

CAN DTC is output

B

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra