Toyota Yaris: Window Defogger System / Rear Window Defogger System does not Operate
DESCRIPTION
An operation request signal is sent to the air conditioning amplifier assembly via LIN communication when the rear window defogger switch (air conditioning control assembly) is operated. When the air conditioning amplifier assembly receives the signal, it sends an operation request signal via CAN communication to the main body ECU (multiplex network body ECU).When the main body ECU (multiplex network body ECU) receives the signal, it sends an operation request signal via CPXI communication to the power distribution box assembly. After the operation request signal is received by the power distribution box assembly it outputs an operation signal and operates the window defogger.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
- With the negative (-) battery terminal connected, disconnect/do not connect the connector of the power distribution box assembly.
- When replacing the power distribution box assembly, the system may not operate normally if the same part number is not used.
-
The window defogger system uses the CAN communication system, LIN communication system and CXPI communication system. Inspect the communication function by following How to Proceed with Troubleshooting.
Troubleshoot the window defogger system after confirming that the communication system is functioning properly.
Click here
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PROCEDURE
| 1. | READ VALUE USING GTS (REAR DEFOGGER INPUT SIGNAL) |
(a) Using the GTS, read the Data List.
Body Electrical > Power Distribution Box > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Rear Defogger Input Signal | Window defogger switch signal input condition | ON or OFF | ON: Rear window defogger switch is on OFF: Rear window defogger switch is off | - |
| Tester Display |
|---|
| Rear Defogger Input Signal |
OK:
The Data List value displays "ON" with the rear window defogger switch set to ON.
| NG |
.gif) | GO TO STEP 5 |
|
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| 2. | READ VALUE USING GTS (REAR DEFOGGER OUTPUT SIGNAL) |
(a) Using the GTS, read the Data List.
Body Electrical > Power Distribution Box > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Rear Defogger Output Signal | Window defogger output condition | ON or OFF | ON: Window defogger operates OFF: Window defogger does not operate | - |
| Tester Display |
|---|
| Rear Defogger Output Signal |
OK:
When the rear window defogger switch is ON, the data monitor standard value is "ON".
| NG |
| REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - REAR WINDOW DEFOGGER WIRE [BACK DOOR GLASS]) |
(a) Disconnect the 4E power distribution box assembly connector.
(b) Disconnect the X1 rear window defogger wire (back door glass) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 4E-43 - X1-1 (B) | Always | Below 1 Ω |
| 4E-43 or X1-1 (B) - Body ground | Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE [BACK DOOR GLASS] - BODY GROUND) |
(a) Disconnect the Y6 rear window defogger wire (back door glass) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Y6-1 (E) - Body ground | Always | Below 1 Ω |
| OK |
| REPAIR REAR WINDOW DEFOGGER WIRE (BACK DOOR GLASS) |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 5. | CHECK AIR CONDITIONING SYSTEM |
(a) Check the air conditioning system.
Click here
HINT:
Both the window defogger system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly via the same communication line.
OK:
The air conditioning system operates normally.
| NG |
| GO TO AIR CONDITIONING SYSTEM |
|
| 6. | CHECK AIR CONDITIONING CONTROL ASSEMBLY |
(a) Check that the defogger indicator illuminates when the window defogger switch is on.
OK:
Defogger indicator illuminates.
| NG |
| REPLACE AIR CONDITIONING CONTROL ASSEMBLY |
|
| 7. | PERFORM ACTIVE TEST USING GTS |
(a) Using the GTS, perform the Active Test.
Body Electrical > Air Conditioner > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Rear Defogger Relay | Rear window defogger wire (Back door glass) | OFF or ON | - |
| Tester Display |
|---|
| Rear Defogger Relay |
OK:
Rear window defogger wire (back door glass) warms up.
| OK |
| REPLACE AIR CONDITIONING CONTROL ASSEMBLY |
| NG |
| REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST (a) Perform the Active Test according to the display on the GTS. Body Electrical > Power Distribution Box > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Rear Defogger Input Signal Window defogger switch signal input condition ON or OFF ON: Window defogger switch is on OFF: Window defogger switch is off - Rear Defogger Output Signal Window defogger output condition ON or OFF ON: Window defogger operates OFF: Window defogger does not operate - Rear Defogger Output Current Window defogger current Min...
Window Defogger Wire
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The fuel gauge shows approximately how much fuel is remaining in the tank when the ignition is switched ON. We recommend keeping the tank over 1/4 full.
