2021 HONDA ODYSSEY key battery

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Page 115 of 787

HONDA ODYSSEY 2021  Owners Manual (in English) 113
uuIndicators uDriver Information Interface Wa rning and Information Messages
Continued
Instrument Panel
MessageConditionExplanation
•Appears when you close the door with the power 
mode in ON wi

Page 158 of 787

HONDA ODYSSEY 2021  Owners Manual (in English) 156
Controls
Locking and Unlocking the Doors
Key
This vehicle comes with the following keys:
Use the keys to start and stop the engine, and to lock and unlock all the doors, 
tailgate, and fuel fill d

Page 159 of 787

HONDA ODYSSEY 2021  Owners Manual (in English) 157
uuLocking and Unlocking the Doors uKey
Controls
The built-in key can be used to lock/unlock the 
doors and tailgate when the remote battery 
becomes weak and the power door lock/
unlock operation

Page 166 of 787

HONDA ODYSSEY 2021  Owners Manual (in English) uuLocking and Unlocking the Doors uLocking/Unlocking the Doors from the Outside
164
Controls
■Unlocking the doors and tailgate
Press the unlock button.
Once: u Some exterior lights flash twice, and

Page 193 of 787

HONDA ODYSSEY 2021  Owners Manual (in English) 191Continued
Controls
Security System
Immobilizer System
The immobilizer system prevents a key that has not been pre-registered from 
starting the engine. Each key  contains electronic transmitters th

Page 194 of 787

HONDA ODYSSEY 2021  Owners Manual (in English) uuSecurity System uSecurity System Alarm
192
Controls
■To deactivate the security system alarm
Unlock the vehicle using remote  transmitter or smart entry system*, or set the power 
mode to ON. The

Page 557 of 787

HONDA ODYSSEY 2021  Owners Manual (in English) Continued555
uuWhen Driving uStarting the Engine
Driving
■To stop the engine1Remote Engine Start with Vehicle Feedback*
•Another registered remo te is in the vehicle.•There is any antenna failur

Page 712 of 787

HONDA ODYSSEY 2021  Owners Manual (in English) 710
Maintenance
Remote Transmitter Care
Replacing the Button Battery
If the indicator does not come on when the button is pressed, replace the battery.
1.Remove the built-in key.
2. Remove the upper h
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