WINDOW / GLASS WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate
DESCRIPTION
When the rear defogger switch in the air conditioning control assembly is operated, an operation request signal is sent to the air conditioning amplifier assembly via LIN communication. When the air conditioning amplifier assembly receives an operation request signal, an operation request signal is sent to the main body ECU (multiplex network body ECU) via CAN communication. The main body ECU (multiplex network body ECU) turns on the RR DEF relay through the IC of the power distribution box assembly and the window defogger operates.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- NOTICE:
- ·
Inspect the fuses for circuits related to this system before performing the following procedure.
·If the auxiliary battery voltage becomes low, auxiliary battery load control will operate in order to ensure sufficient power is supplied to the power steering system. In this case, the window defogger system may not operate.
·The window defogger system uses the CAN communication system and CXPI communication system. First, confirm that there are no malfunctions in the CAN communication system and CXPI communication system. Refer to How to Proceed with Troubleshooting.
PROCEDURE
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: Window defogger switch is off
ON: 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:
Proceed to OK NG
OK
NG
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
NG
Disconnect the 4G power distribution box assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition 4G-1 - Body ground Ignition switch off*1
Always*211 to 14 V
*1: for HV Model
*2: for Gasoline Model
- Result:
Proceed to OK NG
OK
NG
Disconnect the 4E power distribution box assembly connector.
Disconnect the T2 and T16 rear window defogger wire (back door glass) connectors.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition Click Location & Routing(T2,T16)Location & Routingewd_type=routing;type=c,c;code=T2,T16
Click Connector(T2)Body>No. 1 Back Door Wire>Rear Window Defogger (Back door Glass)ewd_type=component;type=c;code=T2;pinno=1
Click Connector(T16)Body>No. 1 Back Door Wire>Rear Window Defogger (Back door Glass)ewd_type=component;type=c;code=T16;pinno=1
4E-43 - T2-1 (B) Always Below 1 Ω 4E-43 or T2-1 (B) - Body ground Always 10 kΩ or higher T16-1 (L) - Body ground Always Below 1 Ω
- Result:
Proceed to OK NG
OK
NG
Replace the power distribution box assembly with a new or known good one.
Check that the window defogger system operates normally.
- OK:
The window defogger system operates normally.
- Result:
Proceed to OK NG
OK
NG
Check the air conditioning system.
- 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
NG
for HV Model: Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for HV Model)>HOW TO PROCEED WITH TROUBLESHOOTING202111,999999,_58,_111841,_0499787,RM100000001Z053,
for Gasoline Model: Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model)>HOW TO PROCEED WITH TROUBLESHOOTING202111,999999,_58,_111841,_0499788,RM100000001Z06R,
Check that the defogger indicator illuminates when the window defogger switch is on.
- OK:
Defogger indicator illuminates.
- Result:
Proceed to OK NG
OK
NG
Perform the Active Test according to the display on the GTS.
- 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:
The window defogger system operates normally.
- Result:
Proceed to OK NG
OK
NG