RM38T0EC _59 Vehicle Exterior _115107 WINDOW / GLASS _0510867 WINDOW DEFOGGER SYSTEM J

WINDOW / GLASS  WINDOW DEFOGGER SYSTEM  Rear Window Defogger System does not Operate  


DESCRIPTION

for Mechanical Control Type:

When the rear window defogger switch on the No. 1 heater control sub-assembly is operated, the operation signal is transmitted to the power distribution box assembly. When the power distribution box assembly receives the signal, it turns on the RR DEF relay to operate the window defogger system.


for Electrical Control Type:

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 system.


WIRING DIAGRAM

E548261E02
6.021,5.323 6.177,5.521 0.156,0.198 10 false E 5.01,5.302 5.167,5.5 0.156,0.198 10 false B 3.094,3.438 5.396,3.729 2.302,0.292 10 false No. 1 Heater Control Sub-assembly 6.219,5.427 6.656,5.656 0.438,0.229 10 false U28 1.208,4.896 1.615,5.083 0.406,0.188 10 false IC 1.198,6.292 4.354,6.552 3.156,0.26 10 false Power Distribution Box Assembly 4.708,5.802 6.458,6.26 1.75,0.458 10 false Rear Window Defogger Wire (Back Door Glass) 3.094,3.271 3.552,3.469 0.458,0.198 10 false I146 5.635,1.438 6.25,1.635 0.615,0.198 10 false IG+ 2.354,2.76 2.969,2.958 0.615,0.198 10 false ERDF 5.531,2.802 6.146,3 0.615,0.198 10 false RDEF 3.76,4.406 4.167,4.594 0.406,0.188 10 false 8C 3.76,4.198 4.167,4.385 0.406,0.188 10 false 23 2.625,4.729 3.031,4.917 0.406,0.188 10 false +B1 3.75,5.427 4.156,5.615 0.406,0.188 10 false 8F 3.771,5.229 4.177,5.417 0.406,0.188 10 false 43 4.635,5.427 5.073,5.635 0.438,0.208 10 false U27 0.177,0.198 4.031,0.438 3.854,0.24 12 false for Mechanical Control Type: 4.719,5.219 5.125,5.406 0.406,0.188 10 false 1 6.313,5.208 6.719,5.396 0.406,0.188 10 false 1 6.01,2.802 6.417,2.99 0.406,0.188 10 false 6 2.156,2.76 2.563,2.948 0.406,0.188 10 false 2 6,1.438 6.406,1.625 0.406,0.188 10 false 5 3.052,1.396 3.667,1.594 0.615,0.198 10 false OFF 3.479,1.396 4.094,1.594 0.615,0.198 10 false ON 2.625,2.052 4.927,2.344 2.302,0.292 10 false Rear Defogger Switch 2.781,1.604 3.396,1.802 0.615,0.198 10 false - 2.781,1.833 3.396,2.031 0.615,0.198 10 false - 2.938,2.667 3.979,3.073 1.042,0.406 10 false Timer circuit 3.229,0.49 4.854,0.927 1.625,0.438 10 false from IGP-MAIN Relay 5.177,0.688 6.417,0.969 1.24,0.281 10 false ECU-IGP NO. 2 1.833,5.688 2.469,5.906 0.635,0.219 10 false RR DEF

E426701E13
5.115,1.719 6.583,2.156 1.469,0.438 10 false Air Conditioning Control Assembly 0.625,4.979 2.281,5.438 1.656,0.458 10 false Main Body ECU (Multiplex Network Body ECU) 2.823,5 5.01,5.573 2.188,0.573 10 false Power Distribution Box Assembly 5.438,3.906 5.75,4.104 0.313,0.198 10 false 43 5.438,4.104 5.75,4.302 0.313,0.198 10 false 8F 2.26,3.5 2.583,3.677 0.323,0.177 10 false 22 2.25,3.708 2.563,3.906 0.313,0.198 10 false MB 3.01,1.719 4.583,2.177 1.573,0.458 10 false Air Conditioning Amplifier Assembly 5.385,6.26 5.802,6.5 0.417,0.24 10 false U27 3.51,6.26 3.885,6.469 0.375,0.208 10 false U28 3.896,6.156 4.208,6.354 0.313,0.198 10 false E 5.177,6.156 5.49,6.354 0.313,0.198 10 false B 0.729,6.615 2.792,6.854 2.063,0.24 10 false : CAN Communication Line 0.74,6.99 2.677,7.208 1.938,0.219 10 false : LIN Communication Line 0.729,7.365 2.708,7.646 1.979,0.281 10 false : CXPI Communication Line 3.719,6.708 5.458,7.427 1.74,0.719 10 false Rear Window Defogger Wire (Back Door Glass) 3.583,6.052 3.906,6.229 0.323,0.177 10 false 1 3.177,3.688 3.49,3.885 0.313,0.198 10 false IC 5.469,6.042 5.792,6.219 0.323,0.177 10 false 1 3.802,4.365 4.448,4.573 0.646,0.208 10 false RR DEF 4.563,3.427 5.208,3.635 0.646,0.208 10 false +B1 1.802,3.708 2.417,3.906 0.615,0.198 10 false CXPI 0.167,0.167 5.427,0.51 5.26,0.344 12 false for Electrical Control Type:

CAUTION / NOTICE / HINT

NOTICE:
·

Inspect the fuses for circuits related to this system before performing the following procedure.

·

With the negative (-) auxiliary battery terminal connected, do not disconnect/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 hereVehicle Exterior>WINDOW / GLASS>WINDOW DEFOGGER SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING

·

Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*

*: w/ Smart Entry and Start System




PROCEDURE

1.READ VALUE USING GTS
a.

Read the Data List 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 OFF or ON OFF: Rear window defogger switch is off
ON: Rear window defogger switch is on 		-
Body Electrical > Power Distribution Box > Data List
Tester Display
Rear Defogger Input Signal
50003 475 1280
OK:

On the GTS screen, ON or OFF is displayed accordingly.



Result:
Result Proceed to
OK A
NG (for Electrical Control Type) B
NG (for Mechanical Control Type) C



A

2.READ VALUE USING GTS

B

5.CHECK AIR CONDITIONING SYSTEM

C

8.CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - NO. 1 HEATER CONTROL SUB-ASSEMBLY)
2.READ VALUE USING GTS
a.

Read the Data List 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 Output Signal Window defogger output condition OFF or ON OFF: Window defogger does not operate
ON: Window defogger operates 		-
Body Electrical > Power Distribution Box > Data List
Tester Display
Rear Defogger Output Signal
50003 475 1281
OK:

On the GTS screen, ON or OFF is displayed accordingly.



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - REAR WINDOW DEFOGGER WIRE (BACK DOOR GLASS))

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


3.CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - REAR WINDOW DEFOGGER WIRE (BACK DOOR GLASS))
a.

Disconnect the 8F power distribution box assembly connector.


b.

Disconnect the U27 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
8F-43 - U27-1 (B) Always Below 1 Ω
8F-43 or U27-1 (B) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE (BACK DOOR GLASS) - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE (BACK DOOR GLASS) - BODY GROUND)
a.

Disconnect the U28 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
U28-1 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPAIR REAR WINDOW DEFOGGER WIRE (BACK DOOR GLASS)

Click hereVehicle Exterior>WINDOW / GLASS>BACK DOOR GLASS>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.CHECK AIR CONDITIONING SYSTEM
a.

Check the air conditioning system.

for HEV Model:

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for HEV Model)>HOW TO PROCEED WITH TROUBLESHOOTING

for Gasoline Model with Automatic Air Conditioning System:

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System)>HOW TO PROCEED WITH TROUBLESHOOTING

for Gasoline Model with Manual Air Conditioning System for Electrical Control Type:

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System for Electrical Control Type)>HOW TO PROCEED WITH TROUBLESHOOTING

for Gasoline Model with Manual Air Conditioning System for Mechanical Control Type:

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System for Mechanical Control Type)>HOW TO PROCEED WITH TROUBLESHOOTING


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.



Result:
Proceed to
OK
NG



OK

6.CHECK AIR CONDITIONING CONTROL ASSEMBLY

NG

GO TO AIR CONDITIONING SYSTEM

for HEV Model: Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for HEV Model)>HOW TO PROCEED WITH TROUBLESHOOTING

for Gasoline Model with Automatic Air Conditioning System: Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System)>HOW TO PROCEED WITH TROUBLESHOOTING

for Gasoline Model with Manual Air Conditioning System for Electrical Control Type: Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System for Electrical Control Type)>HOW TO PROCEED WITH TROUBLESHOOTING

for Gasoline Model with Manual Air Conditioning System for Mechanical Control Type: Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System for Mechanical Control Type)>HOW TO PROCEED WITH TROUBLESHOOTING


6.CHECK AIR CONDITIONING CONTROL ASSEMBLY
a.

Check that the defogger indicator illuminates when the window defogger switch is on.

OK:

Defogger indicator illuminates.



Result:
Proceed to
OK
NG



OK

7.PERFORM ACTIVE TEST USING GTS

NG

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING PANEL (for Electrical Control Type)>REMOVAL


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 -
Body Electrical > Air Conditioner > Active Test
Tester Display
Rear Defogger Relay
50004 450 7
OK:

Rear window defogger wire (back door glass) warms up.



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING PANEL (for Electrical Control Type)>REMOVAL


NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


8.CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - NO. 1 HEATER CONTROL SUB-ASSEMBLY)
a.

Disconnect the 8C power distribution box assembly connector.


b.

Disconnect the I146 No. 1 heater control sub-assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
8C-23 - I146-6 (RDEF) Always Below 1 Ω
8C-23 or I146-6 (RDEF) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

9.CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL SUB-ASSEMBLY - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL SUB-ASSEMBLY - BODY GROUND)
a.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
I146-5 (IG+) - Body ground Ignition switch ON 11 to 14 V
Ignition switch off Below 1 V



b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I146-2 (ERDF) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE NO. 1 HEATER CONTROL SUB-ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING PANEL (for Mechanical Control Type)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR