Toyota Tundra. Manual — part 757

Fig. 180: Identifying Windshield Deicer System Part Location
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

SYSTEM DIAGRAM

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

Fig. 181: Identifying Windshield Deicer System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Communication table:

COMUNNICATION TABLE TRANSMITTER RECEIVER SIGNAL CHART

SYSTEM DESCRIPTION

1. GENERAL

The windshield deicer system's thin heater wires are attached to the inside of the windshield glass and
deice the windshield surface quickly. The indicator light illuminates while the system is operating. The
system automatically turns off after approximately 15 minutes. The windshield deicer switch is built into
the mirror heater switch.

2. FUNCTION OF MAIN COMPONENT

FUNCTION OF MAIN COMPONENT

3. DESCRIPTION

Transmitter

Receiver

Signal

Line

Integration control and panel

Air conditioning amplifier

Windshield deicer switch signal

LIN

Component

Outline

Deicer switch

Located on integration control and panel, detects deicer switch operation and transmits
signals to air conditioning amplifier through LIN communication line

Deicer relay

Receives windshield deicer activation request signals from air conditioning amplifier and
supplies power to windshield deicer

Windshield
deicer

Receives power from deicer relay and heats windshield deicer wire

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

FUNCTION DESCRIPTION

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:



Use these procedures to troubleshoot the windshield deicer system.



*: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP

2. INSPECT BATTERY VOLTAGE

Standard voltage:

11 to 14 V

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

3. CHECK LIN COMMUNICATION SYSTEM

a. Check if the LIN communication system is functioning normally (see HOW TO PROCEED

WITH TROUBLESHOOTING ).

Result

LIN COMMUNICATION SYSTEM RESULT REFERENCE CHART

B: Go to LIN COMMUNICATION SYSTEM (See HOW TO PROCEED WITH
TROUBLESHOOTING )

A: Go to Next Step

4. PROBLEM SYMPTOMS TABLE

a. Refer to the PROBLEM SYMPTOMS TABLE .

Result

PROBLEM SYMPTOMS RESULT REFERENCE CHART

Function

Outline

Windshield
surface deicer



Deicer relay receives windshield deicer activation request signals from air
conditioning amplifier and supplies power to windshield deicer



Receives power from deicer relay and heats windshield deicer wire

Result

Proceed to

LIN communication system is normal

A

LIN communication system is not normal

B

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

B: Go to step 6

A: Go to Next Step

5. OVERALL ANALYSIS AND TROUBLESHOOTING*

a. See TERMINALS OF ECU .

b. See DATA LIST / ACTIVE TEST .

c. See OPERATION CHECK .

6. REPAIR OR REPLACE

7. CONFIRMATION TEST

NEXT: END

OPERATION CHECK

1. CHECK WINDSHIELD DEICER OPERATION

a. Turn the ignition switch ON.

b. Check that pressing the windshield deicer switch illuminates the indicator and warms the front

windshield surface.

c. Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer

deactivates.

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking
the suspected areas in the order they are listed. Replace parts as necessary.

Windshield deicer system

WINDSHIELD DEICER SYSTEM PROBLEM SYMPTOM CHART

Result

Proceed to

Fault is not listed in problem symptoms table

A

Fault is listed in problem symptoms table

B

Symptom

Suspected Area

See

Windshield deicer system does not
operate

DEICER fuse

WINDSHIELD DEICER DOES

NOT OPERATE

DEICER relay

-

Integration control and panel

-

Air conditioning amplifier

-

LIN communication line

-

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra