Toyota 4Runner: System Description
SYSTEM DESCRIPTION
1. WINDOW DEFOGGER SYSTEM DESCRIPTION
The thin heater wires of the defogger system are attached to the rear window and defog the rear window surface quickly. The system only operates when the back door power window is closed. The indicator light illuminates while the system is operating. The system automatically turns off when the back door power window is opened, or approximately 15 minutes after operation starts. For vehicles with an air conditioning system, there is a timer extension function which can operate the window defogger system for up to an additional 255 minutes.
HINT:
The timer extension function operates when the following conditions are met:
- Ambient Temperature: 0°C (32°F) or less
- Vehicle Speed: 31.1 mph (50 km/h) or more
2. FUNCTION OF MAIN COMPONENT
|
Component |
Outline |
|---|---|
|
Heater control assembly |
Detects defogger switch operation and transmits signals to the air conditioning amplifier through the LIN communication line. |
|
Engine room relay block, junction block (DEF relay) |
Receives rear window defogger activation request signals from the air conditioning amplifier and supplies power to the rear window defogger. |
|
Back door glass (Window defogger wire) |
Receives power from the defogger relay and heats the defogger wire. |
|
Multiplex network door ECU (Back door P/W) |
Sends the back power window position signal to the main body ECU (multiplex network body ECU). |
|
Main body ECU (Multiplex network body ECU) |
Sends the back power window position signal to the air conditioning amplifier. |
|
Back door power window regulator motor assembly |
Sends the back power window position signal to the multiplex network door ECU (back door P/W). |
3. SYSTEM FUNCTION
|
Function |
Outline |
|---|---|
|
Defog rear window surface |
|
Parts Location
PARTS LOCATION
ILLUSTRATION
ILLUSTRATION
...
System Diagram
SYSTEM DIAGRAM
Communication Table
Transmitter
Receiver
Signal
Line
Heater control assembly
Air conditioning amplifier assemb ...
Other materials about Toyota 4Runner:
Ambient Temperature Sensor
Components
COMPONENTS
ILLUSTRATION
Inspection
INSPECTION
PROCEDURE
1. INSPECT COOLER THERMISTOR (AMBIENT TEMPERATURE SENSOR)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Con ...
Precaution
PRECAUTION
1. IGNITION SWITCH EXPRESSION
(a) The type of ignition switch used on this model differs depending on the specifications
of the vehicle. The expressions listed in the table below are used in this section.
Expression
Igniti ...
0.0182