Honda HR-V Owners & Service Manuals

Honda HR-V: Rear Window Defogger System Description - Control/Function

Honda HR-V (2015-2021) Service Manual / HVAC / HVAC System - Testing & Troubleshooting / Description / Rear Window Defogger System Description - Control/Function

The Timer Function (Without Climate Control)

The rear window defogger provides the timer control function that is controlled by the HVAC control unit. The timer control is operated by turning the vehicle to the ON mode, then turn on the rear window defogger switch.

The timer operating time varies according to ambient temperature. If the rear window defogger switch is turned on when the timer is active, it toggles between ON and OFF every time the switch is pressed.

Timer operation time is changed under the following conditions:

  • When the evaporator temperature sensor detection is lower than 16 ºF (-9 ºC), the timer operation time is unlimited.
  • When the evaporator temperature sensor detection is higher than 18 ºF (-8 ºC), the timer operation time is 20 minutes. But when it was lower than 16 ºF (-9 ºC) once, the operation time is changed to unlimited.
  • When the evaporator temperature sensor is failure, the timer operation time is 20 minutes.

The Timer Function (With Climate Control)

The rear window defogger provides the timer control function that is controlled by the climate control unit. The timer control is operated by turning the vehicle to the ON mode, then turning on the rear window defogger switch. The timer operating time varies according to ambient temperature. If the rear window defogger switch is turned on when the timer is active, it toggles between ON and OFF every time the switch is pressed.

HVAC System - Testing & Troubleshooting

HVAC System - Testing & Troubleshooting

REAR WINDOW DEFOGGER SYSTEM DESCRIPTION - OVERVIEW

All vehicles of this model come equipped with the rear window defogger. The rear window defogger switch is integrated into the climate control unit or heater control panel.

HVAC System - Testing & Troubleshooting

HVAC System - Testing & Troubleshooting

HVAC System - Testing & Troubleshooting

REAR WINDOW DEFOGGER SYSTEM DESCRIPTION - SYSTEM DIAGRAM

With Climate Control

HVAC System - Testing & Troubleshooting

DTC TROUBLESHOOTING INDEX

CLIMATE CONTROL SYSTEM DTC TROUBLESHOOTING INDEX

HVAC System - Testing & Troubleshooting

HVAC System - Testing & Troubleshooting

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