sensor HONDA ACCORD SEDAN 2020 (in English) Service Manual

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uuHonda Sensing ®u Adaptive Cruise Control (ACC) with Low Speed Follow*
Driving
■Automatic cancellation
The beeper sounds and a message appears on the driver information interface when
ACC with Low Speed Follow is automatically canceled. Any of these conditions may
cause the ACC with Low Speed Fo llow to automatically cancel:
• Bad weather (rain, fog, snow, etc.)
• When the radar sensor at the lower part of the front bumper gets dirty.
• The vehicle ahead of yo u cannot be detected.
• An abnormal tire condition is detected, or the tires are skidding.
• Driving on a mountainous road, or driving off road for extended periods.
• Abrupt steering wheel movement.
• When the ABS, VSA ® or CMBS
TM is activated.
• When the ABS or VSA ® system indicator comes on.
• When the vehicle is stopped on a very steep slope.
• When you manually apply the parking brake.
• When the detected vehicle within the AC C with Low Speed Follow range is too
close to your vehicle.
• The camera behind the rearview mirror, or the area around the camera, including
the windshield, gets dirty.
• When the Maximum Load Limit is exceeded.
• When passing through an enclosed space, such as tunnel.
In the following cases, a bu zzer sounds, ACC with Low Speed Follow is deactivated,
and the Cruise Cancelled: Slope Too Steep. Watch Downhill Speed message
appears in the driver information interface.
• The vehicle has repeatedly applied the brakes to maintain the set speed (for
example, you are descending a long slope).
1 Automatic cancellation
Even though ACC with Low Speed Follow has been
automatically canceled, you can still resume the prior
set speed. Wait until the condition that caused ACC
with Low Speed Follow to cancel improves, then
press the SET/– button.

539
uuHonda Sensing ®u Adaptive Cruise Control (ACC)*
Continued
Driving
Adaptive Cruise Control (ACC)*
Helps maintain a constant vehicle speed and a set following interval behind a vehicle
detected ahead of yours, without you having to keep your foot on the brake or the
accelerator.1Adaptive Cruise Control (ACC)*
Important Reminder
As with any system, there are limits to ACC. Use the
brake pedal whenever necessary, and always keep a
safe interval betw een your vehicle and other vehicles.
3WARNING
Improper use of ACC can lead to a crash.
Use ACC only when driving on
expressways or freeways in good
weather conditions.
3WARNING
ACC has limited braking capability.
When your vehicle speed drops below
25 mph (40 km/h), ACC will
automatically cancel and no longer will
apply your ve hicle’s brakes.
Always be prepared to apply the brake
pedal when conditions require.
When to use
■Vehicle speed for adaptive cruise control: Desired speed in a range above
roughly 25 mph (40 km/h) ~.
■Gear position for ACC: In ( 2 or higher position. The radar sensor is at the
lower part of the front
bumper.
The camera is
located behind the
rearview mirror.
* Not available on all models

uuHonda Sensing ®u Adaptive Cruise Control (ACC)*
544
Driving
The system may automatically shut off and the ACC indicator will come on under
certain conditions. Some examples of th ese conditions are listed below. Other
conditions may reduce some of the ACC functions.
■Environmental conditions
• Driving in bad weather (rain, fog, snow, etc.).
■Roadway conditions
• Driving on a snowy or wet roadway (obs cured lane marking, vehicle tracks,
reflected lights, road spray, high contrast).
■Vehicle conditions
• The outside of the windshie ld is blocked by dirt, mud, leaves, wet snow, etc.
• An abnormal tire or wheel condition (Wrong sized, varied size or construction,
improperly inflated, comp act spare tire, etc.).
• The camera temperature gets too high.
• The parking brake is applied.
• When the radar sensor cover is dirty.
• When the front of the vehicle tilts up due to heavy cargo in the trunk or rear seats.
• When tire chains
* are installed.
■ACC Conditions and Limitations1ACC Conditions and Limitations
For directions on the prop er handling of the radar
sensor, refer to the following page. 2 Radar Sensor P. 574
You can read about handling information for the
camera equipped with this system. 2 Front Sensor Camera P. 572
Always keep the radar sensor cover clean.
Never use chemical solvents or polishing powder for
cleaning the sensor cover. Clean it with water or a
mild detergent.
Do not put a sticker on the radar sensor cover or
replace the radar sensor cover.
If you need the radar sensor to be repaired, or
removed, or the radar se nsor cover is strongly
impacted, turn off the system by pressing the MAIN
button and take your vehicle to a dealer.
Have your vehicle checked by a dealer if you find any
unusual behavior of the system (e.g., the warning
message appears too frequently).
If the front of the vehicle is impacted in any of the
following situations, the ra dar sensor may not work
properly. Have your vehi cle checked by a dealer:
•The vehicle mounted onto a bump, curb, chock,
embankment, etc.
•You drive the vehicle where the water is deep.•Your vehicle has a frontal collision.
* Not available on all models

545
uuHonda Sensing ®u Adaptive Cruise Control (ACC)*
Continued
Driving
■Detection limitations
• A vehicle suddenly crosses in front of you.
• The interval between your vehicle and the vehicle ahead of you is too short.
• A vehicle cuts in front of you at a slow speed, and it brakes suddenly.
• When you accelerate rapidly and approach the vehicle ahead of you at high
speed.
• The vehicle ahead of you is a motorcycle, bicycle, mobility scooter, or other small
vehicle.
• When there are animals in front of your vehicle.
• When you drive on a curved or winding or undulating road that makes it difficult
for the sensor to properly detect a vehicle in front of you.
• The speed difference between your vehi cle and a vehicle in front of you is
significantly large.
• An oncoming vehicle suddenly comes in front of you.
• Your vehicle abruptly crosses over in front of an oncoming vehicle.

Continued551
uuHonda Sensing ®u Adaptive Cruise Control (ACC)*
Driving
■Automatic cancellation
The beeper sounds and a message appears on the driver information interface when
ACC is automatically cancel ed. Any of these conditions may cause the ACC to
automatically cancel:
• Bad weather (rain, fog, snow, etc.)
• When the radar sensor at the lower part of the front bumper gets dirty.
• The vehicle ahead of yo u cannot be detected.
• An abnormal tire condition is detected, or the tires are skidding.
• Driving on a mountainous road, or driving off road for extended periods.
• Abrupt steering wheel movement.
• When the ABS, VSA ® or CMBS
TM is activated.
• When the ABS or VSA ® system indicator comes on.
• When you manually apply the parking brake.
• When the detected vehicle within the AC C range is too close to your vehicle.
• The camera behind the rearview mirror, or the area around the camera, including
the windshield, gets dirty.
• When the Maximum Load Limit is exceeded.
• When passing through an enclosed space, such as tunnel.
• Ignoring shift down indication shown in the tachometer display will cancel the
ACC after about 10 seconds.
• The engine speed goes into the tachometer’s red zone.
• The engine speed goes to below 1,000 rpm.
• You shift into neutral temporarily when shifting into a higher or lower gear.
In the following cases, a buzzer sounds, ACC is deactivated, and the Cruise
Cancelled: Slope Too Steep . Watch Downhill Speed message appears in the
driver information interface.
• The vehicle has repeatedly applied the brakes to maintain the set speed (for
example, you are descending a long slope).
1 Automatic cancellation
Even though ACC has been automatically canceled,
you can still resume the prior set speed.
Wait until the condition that caused ACC to cancel
improves, then press the SET/– button.

554
uuHonda Sensing ®u Lane Keeping Assist System (LKAS)
Driving
Lane Keeping Assist System (LKAS)
Provides steering input to help keep the vehicle in the middle of a detected lane and
provides tactile and visual alerts if the ve hicle is detected drifting out of its lane.1Lane Keeping Assist System (LKAS)
Important Safety Reminders
The LKAS is for your convenience only. It is not a
substitute for your vehicle control. The system does
not work if you take y our hands off the steering
wheel or fail to steer the vehicle.
2 Driver Information Interface Warning and
Information Messages P. 105
Do not place objects on the instrument panel.
Objects may reflect on th e windshield and prevent
correct detection of the traffic lanes.
The LKAS only alerts you when lane drift is detected
without a turn signal in use. The LKAS may not detect
all lane markings or lane departures; accuracy will
vary based on weather, speed, and lane marker
condition.
It is always your responsibility to safely operate the
vehicle and avoid collisions.
The LKAS is convenient when it is used on freeways.
The LKAS may not work properly or may work
improperly under the certain conditions:
2 LKAS Conditions and Limitations P. 559
You can read about handling information for the
camera equipped with this system. 2 Front Sensor Camera P. 572
When you operate the turn signals to chan ge lanes, the system is suspended, and
resumes after the signals are off.
If you make a lane change without operating the turn signals, the LKAS alerts
activate, and torque is applied to the steering.
■Front Sensor Camera
Monitors the lane
lines.■Tactile and visual alerts
Rapid vibrations on the steering
wheel and a warning display alert
you that the vehicle is drifting out of
a detected lane.
■Steering input assist
The system applies torque to the steering to keep the vehicle between the left and
right lane lines. The applied torque become s stronger as the vehicle gets closer to
either of the lane lines.

562
uuHonda Sensing ®u Road Departure Mitigation (RDM) System
Driving
Road Departure Mitigation (RDM) System
Alerts and helps to assist you when the system determines a possibility of your
vehicle unintentionally crossing over dete cted lane markings and/or leaving the
roadway altogether.
The front camera behind the rearview mirror
monitors left and right lane markings (in white
or yellow). If your vehicle is getting too close
to detected lane markings without a turn
signal activated, the system, in addition to a
visual alert, applies steering torque and alerts
you with rapid vibrations on the steering
wheel, to help you remain within the detected
lane.
2 Customized Features P. 372, 383
As a visual alert, the Lane Departure
message appears on the driver information
interface.
If the system determines that its steering i nput is insufficient to keep your vehicle on
the roadway, it may apply braking. u Braking is applied only when the lane markings are solid continuous lines.
The system cancels assisting operations wh en you turn the steering wheel to avoid
crossing over detected lane markings.
If the system operates several times without detecting driver response, the system
beeps to alert you.
■How the System Works
1 Road Departure Mitigation (RDM) System
Important Safety Reminder
Like all assistance systems, the RDM system has
limitations.
Over-reliance on the RDM system may result in a
collision. It is always your responsibility to keep the
vehicle within your driving lane.
The RDM system only alerts you when lane drift is
detected without a turn signal in use. The RDM
system may not detect all la ne markings or lane or
roadway departures; accu racy will vary based on
weather, speed and lane marker condition. It is
always your responsibilit y to safely operate the
vehicle and avoid collisions.
You can read about handling information for the
camera equipped with this system. 2 Front Sensor Camera P. 572
The RDM system may not wo rk properly or may work
improperly under the certain conditions: 2 RDM Conditions and Limitations P. 564
There are times when you may not notice RDM
functions due to your opera tion of the vehicle, or
road surface conditions.
In the following case, a beeper sounds, a message
related to the ACC with Low Speed Follow
*/ACC*
appears on the driver information interface, and the
braking function controlled by the RDM system is
canceled.
•The vehicle has repeatedly applied the brakes to
maintain the set speed (for example, you are
descending a long slope).
* Not available on all models

572
uuHonda Sensing ®u Front Sensor Camera
Driving
Front Sensor Camera
The camera, used in system s such as LKAS, RDM, ACC*, ACC with Low Speed
Follow*, CMBSTM and traffic sign recognition system, is designed to detect an object
that triggers any of the systems to operate its functions.
This camera is located behind the rearview
mirror.
To help reduce the likelihood that high interior
temperatures will cause the camera’s sensing
system to shut off, when parking, find a shady
area or face the front of the vehicle away from
the sun. If you use a reflective sun shade, do
not allow it to cover the camera housing.
Covering the camera can concentrate heat on
it.
■Camera Location and Handling Tips
1 Front Sensor Camera
Never apply a film or attach any objects to the
windshield, the hood, or th e front grille that could
obstruct the camera’s fiel d of vision and cause the
system to operate abnormally.
Scratches, nicks, and othe r damage to the windshield
within the camera’s fiel d of vision can cause the
system to operate abnormall y. If this occurs, we
recommend that you replac e the windshield with a
genuine Honda replacem ent windshield. Making
even minor repairs within th e camera’s field of vision
or installing an aftermarket replacement windshield
may also cause the system to operate abnormally.
After replacing the winds hield, have a dealer
recalibrate the camera. Pr oper calibration of the
camera is necessary for the system to operate
properly.
Do not place an object on the top of the instrument
panel. It may reflect onto the windshield and prevent
the system from detecting lane lines properly.
Front Sensor
Camera
* Not available on all models

573
uuHonda Sensing ®u Front Sensor Camera
Driving
1Front Sensor Camera
If the Some Driver Assist Systems Cannot
Operate: Camera Temperature Too High message
appears:
•Use the climate control system to cool down the
interior and, if necessary, also use defroster mode
with the airflow directed towards the camera.
•Start driving the vehicle to lower the windshield
temperature, which cool s down the area around
the camera.
If the Some Driver Assist Systems Cannot
Operate: Clean Front Windshield message
appears:
•Park your vehicle in a sa fe place, and clean the
windshield. If the message does not disappear after
you have cleaned the windshield and driven for a
while, have your vehicle checked by a dealer.

574
uuHonda Sensing ®u Radar Sensor
Driving
Radar Sensor
The radar sensor is at the lower part of the
front bumper.
• Do not change the position of the radar
sensor or any of the surrounding parts.
• Do not apply paint, stickers, or attach non-
genuine accessories to the front part of the
radar sensor or the surrounding area. Be
particularly careful that any custom license
plate frame or other accessory does not
block any part of the radar beam path (see
adjacent illustration).1Radar Sensor
Avoid strong impacts to the radar sensor cover.
For the CMBS
TM to work properly:
•Always keep the radar sensor cover clean.•Never use chemical solvents or polishing powder
for cleaning the sensor cove r. Clean it with water
or a mild detergent.
•Do not put a sticker on th e radar sensor cover or
replace the radar sensor cover.
If you need the radar sensor to be repaired, or
removed, or the radar se nsor cover is strongly
impacted, turn off the syst em by using the safety
support switch and take y our vehicle to a dealer.
2 CMBS
TM On and Off P. 516
If the vehicle is involved in any of the following
situations, the radar sensor may not work properly.
Have your vehicle checked by a dealer:
•Your vehicle is involved in a frontal collision.•Your vehicle drives th rough deep water or is
submerged in deep water.
•Your vehicle strongly strikes a bump, curb, chock,
or embankment that coul d jar the radar sensor.
Radar
Sensor
Do not apply paint, stickers, or
attach accessories to the front
part of the radar sensor or the
surrounding area.