Window defogger system
Parts location System information Troubleshooting Circuit diagnosis Removal / installation
GLASS & WINDOW
WINDOW DEFOGGER SYSTEM
FUNCTION INSPECTION
1. Operation inspection of rear window defogger
(1) When the customize function is set to the normal drive mode
(a) Turn the ignition switch to ON.
(b) Make sure the indicator light illuminates and the back door glass (window defogger) warms up when the defogger switch is pushed.
(c) Make sure the indicator light turns off and the window defogger operation stops after approx. 15 minutes.
(2) When the customize function is set to the continuous drive mode *1
(a) Turn the ignition switch to ON.
(b) Make sure the indicator light illuminates and the back door glass (window defogger) warms up when the defogger switch is pushed.
(c) Make sure that approx. 15-min. operation and 2-min. stop are repeated.
*1: For automatic air conditioning system
PARTS LOCATION
SYMPTOM TABLE
For automatic air conditioning system
| Symptoms |
Inspection items |
Reference pages |
|---|---|---|
| Window defogger does not operate |
Refer to troubleshooting flowchart “Window defogger does not operate”. |
 |
Except for automatic air conditioning system
| Symptoms |
Inspection items |
Reference pages |
|---|---|---|
| Window defogger does not operate (Indicator light illuminates). |
DEF fuse |
|
| DEF relay |
|
|
| Back door glass (window defogger) |
- |
|
| Vehicle wiring harness and connector |
- |
|
| Window defogger does not operate (Indicator light turns off). |
HEATER fuse |
|
| Heater control ASSY (defogger switch) |
|
|
| Vehicle wiring harness and connector |
- |
HOW TO TROUBLESHOOT
1.
Bring in the car
Next▼
2.
Interview and phenomenon check
(1) Perform the interview and phenomenon check (Refer to )
)Next▼
3.
Check vehicle status
(1) Check the vehicle specification.
Result
| Result |
Go to |
|---|---|
| For automatic air conditioning system |
A |
| Except for automatic air conditioning system |
B |
B
>Go to Step 5.
A▼
4.
Inspection of CAN communication system
(1) Check CAN communication system. (Refer to )
)
Result
| Result |
Go to |
|---|---|
| Functioning properly |
A |
| Not functioning properly |
B |
B
>Go to the CAN communication system section (Refer to )
)A▼
5.
Symptom table
(1) Check the symptom table. (Refer to )
)
Result
| Result |
Go to |
|---|---|
| Not applicable to the symptom table. |
A |
| Applicable to the symptom table. |
B |
B
>Go to Step 7.
A▼
6.
Based on the trouble phenomenon, perform troubleshooting following the steps below.
(1) Function check (refer to )
)(2) ECM terminal matrix (Refer to )
)(3) Display of current data/system operation check mode *1 (Refer to).
*1: For automatic air conditioning system
).
*1: For automatic air conditioning systemNext▼
7.
Adjustment, repair, or replacement
Next▼
8.
Confirmation test
Next▼
Complete
CHECK LIST FOR INTERVIEW
CUSTOMIZE FUNCTION
1. Customization of window defogger system
(1) Customize using the SSM3
(a) Connect the SSM3 to the DLC3 and turn the ignition to IG ON.
(b) On the SSM3 display, select [Each System Check] → [Integ. unit mode] → [Unit customizing] and perform the customization setting.
| Display name |
Initial setting |
Contents |
Setting |
Controller ECM |
|---|---|---|---|---|
| Rear defogger operation mode |
Normal |
Rear defogger operation drive mode setting |
Normal *1 / Continuous *2 |
Main body ECM (Network gateway computer) |
·*1: Rear defogger operation is turned OFF after 15 minutes.
·*2: Rear defogger repeats 15-min. operation and 2-min. stop.
·*2: Rear defogger repeats 15-min. operation and 2-min. stop.
CIRCUIT FIGURE
ECM TERMINAL ARRANGEMENT
1. Instrument panel junction block ASSY, main body ECM (Network gateway computer)
Captions in illustration
| *1 |
Instrument panel junction block ASSY |
*2 |
Main body ECM (Network gateway computer) |
(1) Inspection of the instrument panel junction block ASSY and the main body ECM (network gateway computer)
(a) Measure the voltage between the terminals.
Standard value
| Terminal No. (Terminal symbol) |
Inspection conditions |
Standard value |
|---|---|---|
| A73-24 ←→ chassis ground |
IG ON |
11 to 14 V |
| D5-22 (ACC) ←→ chassis ground* |
ACC ON |
11 to 14 V |
*: When there is a smart entry & start system
NOTE:
If it is outside the standard values, the vehicle is defective.
2. Heater control SUB-ASSY (Rear window defogger switch) (except for automatic air conditioning system)
(1) Disconnect the connector D22 of the heater control SUB-ASSY (Rear window defogger switch).
(2) Measure the voltage and resistance between terminals.
(3) Connect the connector D22 of the heater control SUB-ASSY (Rear window defogger switch).
DISPLAY OF CURRENT DATA/SYSTEM OPERATION CHECK MODE
1. Inspection with SSM3
(1) Data monitor
(a) Using SSM3, check [Current Data Display] to determine functionality and narrow down the defective part.
SSM3 screen: [Each System Check]→ [Integ. unit mode]→ [Current Data Display & Save]
| Item Name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Rr Defogger op. mode] |
Rear defogger operation status/ Display range: Normal - Continuous* |
Normal: OFF after 15 minutes Continuous: 15-min. operation and 2-min. stop are repeated. |
- |
| [Rear Defogger SW Input] |
Rear defogger switch status/ Display range: [ON] - [OFF] |
- |
- |
| [Rr Defogger output] |
Rear defogger output status/ Display range: [ON] - [OFF] |
- |
- |
*: For automatic air conditioning system
SSM3 display: [Each System Check] → [Air Condition System] → [Current Data Display · Save]
| Item Name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Rear Defogger relay] |
Rear defogger relay status/ Display range: [ON] - [OFF] |
- |
- |
(2) System Operation Check Mode
(a) Using SSM3, check [System Operation Check Mode] to determine functionality and narrow down the defective part.
SSM3 display: [Each System Check] → [Integ. unit mode] → [System Operation Check Mode]
| Item Name |
Drive |
|---|---|
| [Rear defogger] |
Rear defogger output ON / OFF |
SSM3 display: [Each System Check] → [Power Window] → [System Operation Check Mode]
| Item Name |
Drive |
|---|---|
| [P seat power window UP/DOWN] |
UP / DOWN |
| Window defogger does not operate |
|---|
Description of functions
When IG is ON, operating the rear window defogger switch turns on the rear window defogger.
Except for automatic air conditioning system
Rear window defogger control is performed by the main body ECM (network gateway computer). When the switch ON signal is received, RR DEF relay operates for 15 minutes. When the switch OFF signal is received within 15 minutes, operation of DEFOG relay stops.
For automatic air conditioning system
Rear window defogger control is performed by the main body ECM (network gateway computer). When the switch ON signal is transmitted from the air conditioner control ASSY through the CAN communication to the main body ECM (network gateway computer), RR DEF relay operates for 15 minutes. When the switch OFF signal is received within 15 minutes, operation of RR DEF relay stops.
Circuit figure
Inspection steps
WARNING:
·Window defogger system uses CAN communication. First, follow the “How to troubleshoot” and perform the “Communication function inspection” to check that malfunction does not occur in the communication system, and then proceed to the troubleshooting.
·Before performing the troubleshooting, check the fuse of this circuit.
·Before performing the troubleshooting, check the fuse of this circuit.
1.
Performing the SSM3 system operation check mode (R defogger output)
(1) Using SSM3, perform the [System Operation Check Mode] by following the display.
SSM3 display: [Each System Check] → [Integ. unit mode] → [System Operation Check Mode]
| Item Name |
Contents of testing |
Constraints |
|---|---|---|
| [Rr Defogger output] |
Rear defogger output ON / OFF |
- |
Result
| Result |
Go to |
|---|---|
| Window defogger is not activated. |
A |
| Window defogger is activated. |
B |
B
>Perform the circuit test shown on the symptom table. (Refer to )
)A▼
2.
Unit inspection of defogger relay (RR DEF relay)
(1) Perform unit inspection of the defogger relay (RR DEF relay). (Refer to )
)NG
>Replacement of defogger relay (RR DEF relay)
OK▼
3.
Inspection of wire harness and connector (defogger relay - IG 1 No. 1 relay and battery)
(1) Detach the defogger relay (RR DEF relay) from the engine compartment relay block.
NG
>Repair or replacement of wiring harness or connector
OK▼
4.
Inspection of wire harness and connector (defogger relay - main body ECM (network gateway computer))
(1) Detach the defogger relay (RR DEF relay) from the engine compartment relay block.
(2) Disconnect the A73 connector of the main body ECM (network gateway computer).
(3) Measure the resistance between the terminals.
B
> Go to Step 5.
C
> Go to Step 7.
A▼
Repair or replacement of wiring harness or connector
5.
Inspection of wire harness and connector (main body ECM (network gateway computer) - heater control SUB-ASSY)
(1) Disconnect the connector D6 for the main body ECM (network gateway computer).
(2) Disconnect the connector D22 of the heater control SUB-ASSY.
NG
>Repair or replacement of wiring harness or connector
OK▼
6.
Unit inspection of heater control SUB-ASSY (Rear defogger switch)
(1) Detach heater control SUB-ASSY (Rear defogger switch) (Refer to )
)(2) Perform unit inspection of heater control SUB-ASSY (Rear defogger switch) (Refer to )
)NG
>Replacement of rear defogger switch
OK▼
7.
Inspection of wire harness and connector (back window glass - defogger relay and chassis ground)
(1) Disconnect the connectors G10 and H29 for the back window glass.
(2) Detach the defogger relay (RR DEF relay) from the engine compartment relay block.
NG
>Repair or replacement of wiring harness or connector
OK▼
Replacement of the back window glass (Refer to )
)