Honda Civic manuals

Subaru Legacy Service Manual: Inspection



The wiper deicer does not operate when the ambient temperature becomes 5°C (41°F) or more.

The wiper deicer operates with the rear window defogger at the same time.

It is possible to perform a forced operation if you keep holding the rear window defogger switch for 3 seconds or more.


Inspection order

Wiper deicer does not operate.

(1) Check the fuse.

(2) Check the wiper deicer relay.

(3) Check the wiper deicer switch.

(4) Check the heat wire.

(5) Check the wiring harness.

(6) Check body integrated unit.


Wiper deicer system can be customized using the Subaru Select Monitor, when the customize setting «Auto A/C ECU Setting» of the body integrated unit is set to {support}.

Set the system using the Rr Defogger op. mode, and setting will be the same as rear defogger system setting.

System name

Initial setting

Customize setting

Rear defogger operation mode


Continuous operation*

*: When one of the following conditions occurs, the continuous operation is suspended and turned to the normal operation.

• Ambient temperature at 5°C (41°F) or more continues for 10 seconds.

• Malfunction occurs on ambient sensor.

• Vehicle speed of 15 km/h (9 MPH) or less continues 15 minutes (OFF when conditions are met)

• Malfunction occurs in CAN communication.

• Battery voltage remains at 10 V or less for 30 seconds.



Before performing the inspection, check the following settings.

Wiper deicer setting > “support”. If “no support”, set to “support” using customize setting.

Rr Defogger op. mode setting > Initial setting or customize setting.

1. Check the input signal when the rear window defogger switch is operated using Subaru Select Monitor.

(1) Connect the Subaru Select Monitor to data link connector.


For detailed operation procedures, refer to “Application help”.

(2) Turn the ignition switch to ON.

(3) On «Start» display, select «Diagnosis».

(4) On «Vehicle selection» display, input the target vehicle information and select «Confirmed».

(5) On «Main Menu» display, select «Each System».

(6) On «Select System» display, select «Integ. Unit Mode» and select «Enter».

(7) On «Select Function» display, select «Data Monitor».

(8) From the data monitor item list, select «Auto A/C Setting».

(9) Check the vehicle equipment and the settings of body integrated unit.

If correct, go to (10).

If not correct, go to (13).

(10) From the data monitor item list, select «Rr Defogger output».

(11) Check the displayed data (ON/OFF) by operating the rear window defogger switch.

(12) On «Select Function» display, select «Customize».

(13) From the Customize item list, select «Auto A/C Setting» and match the auto A/C ECM setting to the actual vehicle equipment.

2. Check the operation with rear window defogger switch ON.

When customize setting is set as “Continuous”, it is normal if the 15-minute operation and 2-minute stop repeats.

When customize setting is “Normal”, it is normal if the operation lasts for 15 minutes and then turns OFF.

3. When the operation in 2) above fails, replace the body integrated unit.


Refer to “HEAT WIRE INSPECTION” of “Rear Window Defogger System”. Rear Window Defogger System > INSPECTION


Heat wire inspection needs removing/installing procedure of instrument panel assembly.

Wiring diagram
Refer to “Wiper Deicer System” in the wiring diagram. Wiper Deicer System ...

Refer to “REPAIR” of “Rear Window Defogger System”. Rear Window Defogger System > REPAIRNOTE:Heat wire repair needs removing/installing procedure of instrument panel assembly. ...

Other materials:

Dtc p0463 fuel level sensor "a" circuit high
DTC DETECTING CONDITION:Detected when two consecutive driving cycles with fault occur.CAUTION:After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.STEPCHECKYESNO1.CHECK FOR ANY OTHER DTC ON DISPLAY.Is DT ...

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