Toyota Tundra. Manual — part 760

b. Measure the voltage according to the value(s) in the table below.

Standard voltage

WINDSHIELD DEICER WIRE TESTER CONNECTION SPECIFIED CONDITION

NG: REPLACE AIR CONDITIONING AMPLIFIER (See AIR CONDITIONING AMPLIFIER )

OK: REPLACE WINDSHIELD GLASS (see REMOVAL )

WINDOW DEFOGGER SYSTEM

PARTS LOCATION

Tester Connection

Condition

Specified Condition

A23-1 (B) - A23-2 (E) Ignition switch ON Windshield deicer switch ON

11 to 14 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

Fig. 190: Identifying Window Defogger System Parts Location
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

SYSTEM DIAGRAM

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

Fig. 191: Identifying Window Defogger System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Communication table:

WINDOW DEFOGGER TRANSMITTER RECEIVER SIGNAL CHART

SYSTEM DESCRIPTION

1. GENERAL

The defogger system's thin heater wires are attached to the rear window and defog the rear window
surface quickly. The indicator light illuminates while the system is operating. The system automatically
turns off after approximately 15 minutes.

2. FUNCTION OF MAIN COMPONENT

WINDOW DEFOGGER FUNCTION OF MAIN COMPONENT

3. DESCRIPTION

WINDOW DEFOGGER FUNCTION DESCRIPTION

Transmitter

Receiver

Signal

Line

Integration control and panel

Air conditioning amplifier

Rear window defogger switch signal

LIN

Component

Outline

Defogger switch

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

Defogger relay

Receives rear window defogger activation request signals from air conditioning
amplifier and supplies power to rear window defogger

Rear window
defogger

Receives power from defogger relay and heats defogger wire

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:



Use these procedures to troubleshoot the window defogger 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 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

Rear window
defogger



Defogger relay receives rear window defogger activation request signals from air
conditioning amplifier and defogs rear window surface



Receives power from defogger relay and heats defogger wire

Result

Proceed to

LIN communication system is normal

A

LIN communication system is not normal

B

Result

Proceed to

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra