2021 HONDA ACCORD SEDAN battery

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uuWhen Driving uStarting the Engine
Driving
3. Press the ENGINE START/STOP button
without depressing the accelerator pedal.
All models1 Starting the Engine
Bring the remote close to the ENGINE START/STOP
button if the battery in the remote is weak.
2 If the Remote Battery is Weak P. 606
The engine may not start if the remote is subjected to
strong radio waves.
Do not hold the ENGINE START/STOP button to
start the engine.
If the engine does not start, wait at least 30 seconds
before starting the engine again.

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uuWhen Driving uStarting the Engine
Driving
■To stop the engine1Remote Engine Start*
The engine may not start by the remote engine start
if:
•You have disabled a remo te engine start setting
using the audio/information screen.
•The power mode is not in VEHICLE OFF.
•The transmission is in a position other than ( P.
•The hood is open, or any door or the trunk is
unlocked.
•You have already used the remote twice to start
the engine.
•The battery charge is too low.
•Another registered remo te is in the vehicle.
•There is any antenna failure.•The door is unlocked with the built-in key.
•The engine oil pressure is low.
•The engine coolant temper ature is extremely high.•The telematics unit* malfunctions.
•The security system alarm is not set.Press and hold the
button for one second.
Go within the range,
and try again.
The exterior lights flash once if the engine stops successfully.
The exterior lights will not flash when the remote is out of
the smart entry system range.
The engine will not stop.
* Not available on all models

uuWhen Driving uStarting the Engine
418
Driving
1Remote Engine Start*
The engine may stop whil e it is running if:•You do not start the vehicl e within 10 minutes of
starting the engine with the remote.
•The engine is stopped by using the remote.•The security system alarm is activated.•The door is unlocked with the built-in key.•The hood is open.•The engine coolant temper ature is extremely high.•The battery is low.•The engine oil pressure is low.•The malfunction indicator la mp comes on if there is
a problem with the emissions control systems.
•You press the ENGINE START/STOP button
without depressing the brake pedal.
•The transmission is in a position other than ( P.
•You press the shift lever release button.
While the engine is running, the vehicle will
automatically preconditi on inside the vehicle.
When it is warm outside:
•The climate control system is activated in auto
mode.
When it is cold outside:
•The defroster is activated at a moderately warm
temperature.
•The rear defogger and door mirror heaters are
activated.
•The seat heaters* and heated steering wheel* are
activated. 2 Heated Steering Wheel
* P. 236
2 Front Seat Heaters* P. 237
2 Front Seat Heaters and Seat Ventilation*
P. 238
Automatic transmission models
Continuously variable transmission models
* Not available on all models

437
uuWhen Driving uAuto Idle Stop*
Continued
Driving
Auto Idle Stop*
To help maximize fuel economy, the engine automatically stops when the vehicle
comes to a stop, depending on environmental and vehicle operating conditions. The
indicator (green) comes on at this time.
The environmental and vehicle conditions that
impact Auto Idle Stop system operation are
varied.
2Auto Idle Stop Activates When: P. 439
The engine then restarts once the vehicle is
about to move again, and the indicator
(green) goes off.
2The Engine Automatically Restarts When:
P. 441
If the driver’s door is opened while the
indicator (green) come s on, a buzzer sounds
to notify you that the Auto Idle Stop function
is in operation.
1 Auto Idle Stop*
The 12-volt battery insta lled in this vehicle is
specifically designed for a m odel with Auto Idle Stop.
Using a 12-volt battery other than this specified type
may shorten the 12-volt ba ttery life, and prevent
Auto Idle Stop from activati ng. If you need to replace
the 12-volt battery, make sure to select the specified
type. Ask a dealer for more details.
The duration of the Au to Idle Stop operation:
•Increase in the ECON mode, compared to when the
ECON mode is off, with climate control in use.
2 ECON Mode P. 436
Auto Idle Stop
Indicator (Green)
* Not available on all models

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uuWhen Driving uAuto Idle Stop*
Driving
The vehicle stops with the shift position in (D and the brake pedal depressed.
When you shift into
(P quickly with depressing the brake pedal, the Auto Idle Stop
continues to operate, even if the brake pedal is released. u If you move the shift lever slowly, the engine may automatically restarts.
■Auto Idle Stop does not activate when:
• The Auto Idle Stop OFF button is pressed.
• The driver’s seat belt is not fastened.
• The engine coolant temperature is low or high.
• The engine is started with the hood open.
u Turn off the engine. Close the hood before you restart the engine to activate
Auto Idle Stop.
• The battery charge is low.
• The internal temperature of the battery is 41°F (5°C) or less.
• The transmission fluid temperature is low or high.
• The transmission is in a position other than
(D.
• The vehicle comes to a stop again before the vehicle speed reaches 3 mph (5 km/h)
after the engine starts.
• Stopped on a steep incline.
• is on (indicator on).
• The climate control system is in use, and the temperature is set to Hi or Lo .
• The climate control system is in use, and the outside temperature is below -4°F
(-20°C) or over 104°F (40°C).
■Auto Idle Stop Activates When:1 Auto Idle Stop Activates When:
Do not open the hood while the Auto Idle Stop
function is activated.
If the hood is opened, the engine will not restart
automatically.
In this case, restart the engine with the ENGINE
START/STOP button.
2 Starting the Engine P. 414
When ACC with Low Speed Follow is in operation,
the vehicle stops without de pressing the brake pedal
and Auto Idle Stop may activate.
In such cases, the engine may restart if you change
the shift position other than
( D.
Pressing the ENGINE START/STOP button causes
the engine to no longer restar ts automatically. Follow
the standard procedure to start the engine.
2 Starting the Engine P. 414

441
uuWhen Driving uAuto Idle Stop*
Driving
• The brake pedal is released (without the automatic brake hold system activated).
• The accelerator pedal is depressed (with th e automatic brake hold system activated).
2Automatic Brake Hold P. 515
■The engine restarts even if the brake pedal is depressed*1 when:
• The Auto Idle Stop OFF button is pressed.
• A steering wheel is operated.
• The transmission is put into
(R, (S*, and (L*, or when it is set from (N to (D.
u If you put the tra nsmission into
(P after the Auto Idle Stop activates, the Auto
Idle Stop continues to operate. In this case, the engine restarts when you move
the shift lever other than
(P. When operating the shift lever, the brake pedal
must be firmly depressed.
• The pressure on the brake pedal is reduced and the vehicle starts moving while
stopped on an incline.
• The brake pedal is released slightly during a stop.
• The battery charge becomes low.
• The accelerator pedal is depressed.
• The driver’s seat belt is unlatched.
• is on (indicator on).
• The climate control system is in use, and the difference between the set
temperature and actual interior temperature becomes significant.
• The climate control system is being used to dehumidify the interior.
• The vehicle ahead of you starts again when your vehicle stops automatically with
ACC with Low Speed Follow.
Briefly keeps the brake applied after releasin g the brake pedal to restart the engine.
This can keep your vehicle from unexpe ctedly moving while on an incline.
■The Engine Automatically Restarts When:
■Starting Assist Brake Function
1The Engine Automatically Restarts When:
If you are using an electroni c device during Auto Idle
Stop, the device may tempor arily be turned off when
the engine restarts.
1 The engine restarts even if the brake pedal is depressed*1 when:
*1: With the automatic brak e hold system activated,
you can release the brake pedal while Auto Idle Stop
is in operation.
If the automatic brake hold system has been turned
off, or if there is a problem with the system, the
engine will restart automatically when you release
the brake pedal.
2 Automatic Brake Hold P. 515
* Not available on all models

443
uuWhen Driving uVehicle Stability AssistTM (VSA ®), aka Electronic Stability Control (ESC), System
Continued
Driving
Vehicle Stability AssistTM (VSA ®), aka Electronic
Stability Control (ESC), System
VSA ® helps stabilize the vehicle during cornering if the vehicle turns more or less
than what was intended. It also assists in maintaining traction on slippery surfaces.
It does so by regulating engine ou tput and selectively applying the brakes.
When VSA ® activates, you may notice that the
engine does not respond to the accelerator.
You may also notice some noise from the
hydraulic brake system. You will also see the
indicator blink.
■VSA ® Operation
1 Vehicle Stability AssistTM (VSA® ), aka Electronic Stability Control
(ESC), System
The VSA ® may not function properl y if tire type and
size are mixed. Make sure to use the same size and
type of tire, and the air pressures as specified.
When the VSA ® system indicator comes on and stays
on while driving, there ma y be a problem with the
system. While this may not interfere with normal
driving, have your vehi cle checked by a dealer
immediately.
VSA ® cannot enhance stability in all driving situations
and does not control the entire braking system. You
still need to drive and corner at speeds appropriate
for the conditions and always leave a sufficient
margin of safety.
The main function of the VSA ® system is generally
known as Electronic Stability Control (ESC). The
system also includes a traction control function.
The Vehicle Stability Assist
TM (VSA ®) system, Vehicle
Stability AssistTM (VSA ®) OFF, adaptive cruise control
(ACC) with Low Speed Follow, safety support and
low tire pressure/TPMS indicators may come on in
amber along with a message in the driver information
interface when you set the power mode to ON after
reconnecting the battery.
Drive a short distance at more than 12 mph (20 km/h).
Each indicator should go off. If any do not, have your
vehicle checked by a dealer.
VSA ® System
Indicator

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uuWhen Driving uTire Pressure Monitoring System (TPMS)
Driving
1Tire Pressure Monitoring System (TPMS)
The low tire pressure/TPMS indicator may come on
under the following conditions:
•A compact spare tire is used.
•There is a heavier and une ven load on the tires,
such as when towing a trailer*, than the condition
at calibration.
•Tire chains* are used.
The Vehicle Stability Assist
TM (VSA ®) system, Vehicle
Stability AssistTM (VSA ®) OFF, adaptive cruise control
(ACC) with Low Speed Follow, safety support and
low tire pressure/TPMS indicators may come on in
amber along with a message in the driver information
interface when you set the power mode to ON after
reconnecting the battery.
Drive a short distance at more than 12 mph (20 km/h).
Each indicator should go off. If any do not, have your
vehicle checked by a dealer.
* Not available on all models