2023 GMC Sierra Denali 3500 HD Seats and Seat Belt 

The 2023 GMC Sierra Denali 3500 HD seats and seat belt systems work together to make the inside of the car both comfortable and safe. This shows that the brand cares about the comfort and safety of both drivers and passengers. The Sierra Denali 3500 HD’s seats are carefully made to be both luxurious and useful. They have quality leather upholstery, intricate stitching, and an ergonomic design. Not only are these seats soft, but they also have adjustable support, so you can ride in comfort and without getting tired, whether you’re going on a long trip or going over rough terrain. Modern seat belt systems, with advanced safety features like pre-tensioners and force limiters, are intended to securely restrain passengers during sudden stops or collisions while minimizing the risk of injury – they go well with the great seats. Cutting-edge seat belt technology and plush seats in the 2023 GMC Sierra Denali 3500 HD make sure that every drive is both comfortable and stress-free. This makes it a standout choice in the heavy-duty truck market.

Head Restraints

The vehicle’s front seats have adjustable head restraints in the outboard seating positions.

Warning
With head restraints that are not installed and adjusted properly, there is a greater chance that occupants will suffer a neck/spinal injury in a crash. Do not drive until the head restraints for all occupants are installed and adjusted properly.
If your vehicle has rear head restraints that fold down, always return them to the full upright position whenever an occupant is seated in the seat.

Adjust the head restraint so that the top of the restraint is at the same height as the top of the occupant’s head. This position reduces the chance of a neck injury in a crash.

Front Seats
The vehicle’s front seats have adjustable head restraints in the outboard seating positions

The height of the head restraint can be adjusted.

To raise or lower the head restraint, press the button located on the side of the head restraint, and pull up or push the head restraint down, and release the button. Pull and push on the head restraint after the button is released to make sure that it is locked in place. The front seat outboard head restraints are not removable.

To raise or lower the head restraint, press the button on the side of the head restraint and pull up or push the head restraint down and release the button.
Pull and push on the head restraint after the button is released to make sure that it is locked in place.
The front seat outboard head restraints are not removable.

Rear Head Restraints
The vehicle’s rear seat has head restraints in the outboard seating positions that cannot be adjusted.

The head restraint can be folded forward to allow for better visibility when the rear seat is unoccupied. To fold the head restraint, press the button on the side of the head restraint.
When an occupant is in the seat, always return the head restraint to the upright position until it locks into place. Push and pull on the head restraint to make sure that
it is locked.

If you are installing a child restraint in the rear seat, see Lower Anchors and Tethers for Children (LATCH System) .

Center Headrest
The vehicle’s rear seat may be equipped with a headrest in the center seating position that cannot be adjusted.
If you are installing a child restraint in the rear seat, see Lower Anchors and Tethers for Children (LATCH System) .

Front Seats

Seat Adjustment
Warning
You can lose control of the vehicle if you try to adjust the driver’s seat while the vehicle is moving. Adjust the driver seat only when the vehicle is not moving.

Warning
The power seats will work with the vehicle off. Children could operate the power seats and be injured. Never leave children alone in the vehicle.

To adjust a manual seat:

1. Lift the handle under the seat to unlock it.
2. Move the seat forward or rearward to adjust the seat position.
3. Release the handle to stop the seat from moving.

Reclining Seatbacks

To recline the seatback:

• Tilt the top of the control rearward to recline.
• Tilt the top of the control forward to raise.

Warning
Sitting in a reclined position when the vehicle is in motion can be dangerous.
Even when buckled up, the seat belts cannot do their job.The shoulder belt will not be against
your body. Instead, it will be in front of you. In a crash, you could go into it, receiving neck or other injuries.
The lap belt could go up over your abdomen. The belt forces would be there, not at your pelvic bones. This could cause serious internal injuries.

For proper protection when the vehicle is in motion, have the seatback upright.

Then sit well back in the seat and wear the seat belt properly. Do not have a seatback reclined if the vehicle is moving.

Lumbar Adjustment

Memory Seats

Overview
If equipped, the memory seat feature allows drivers to save their unique driving positions and a shared exit position. See “Saving Seating Positions” later in this section. The saved positions can be recalled manually by all drivers, see “Manually Recalling Seating Positions” later in this section, and drivers with remote key 1 and 2 can also recall them automatically. See “Auto Seat Entry  Memory Recall” or “Auto Seat Exit Memory Recall” later in this section. To enable automatic recalls, turn on Seat Entry Memory and/or Seat Exit Memory. See “Enabling Automatic Recalls” later in this section. The memory recalls may be canceled at any time during the recall. See “Cancel Memory Seating Recalls” later in this section.

Identifying Driver Number
The vehicle identifies the current driver by their remote key number 1–8. The current remote key number may be identified by the Driver Information Center (DIC) welcome message, “You are driver x for memory recalls.” This message is displayed the first few times the vehicle is turned on when a different remote key is used. For Seat Entry Memory to work properly, save positions to the 1 or 2 memory buttons matching the driver number of this welcome message. To aid in identifying remote key IDs, it is recommended to only carry one remote key when entering the vehicle. Perform the following if the welcome message is not displayed:

1. Move all keys and remote keys away from the vehicle.
2. Start the vehicle with another remote key. A DIC welcome message should be displayed indicating the driver number of the other remote key. Turn the vehicle off and remove the other key or remote key from the vehicle.
3. Start the vehicle with the initial key or remote key. The DIC welcome message should display the driver number of the initial remote key.

Saving Seating Positions
Read these instructions completely before saving memory positions.

To save preferred driving positions to 1 and 2:

1. Turn the vehicle on or to accessory mode. A DIC welcome message may indicate the driver number of the current remote key. See “Identifying Driver Number” previously in this section.
2. Adjust all available memory features to the desired driving position.
3. Press and release SET; a beep will sound.
4. Immediately upon releasing SET, press and hold the memory button 1 or 2 matching the current Driver’s remote key number until two beeps sound. If too much time passes between releasing SET and pressing 1 or 2, the two beeps will not sound indicating memory position were not saved. Repeat Steps 3 and 4 to try again.
5. Repeat Steps 1–4 for the other remote key 1 or 2 using the other 1 or 2 memory button.

It is recommended to save the preferred driving positions to both 1 and 2 if you are the only driver. To save the common exit seating position tothat is used by all drivers for Manually Recalling Seating Positions and Auto Seat Exit Memory Recall features, repeat Steps 1– 4 using the exit button.
Manually Recalling Seating Positions Press and hold 1, 2, or button until the recall is complete, to recall the positions previously saved to that button.
Manual Memory recall movement for 1, 2 orbuttons may be initiated and will complete to the saved memory position if the vehicle is in or out of P (Park).

Enabling Automatic Recalls

• Seat Entry Memory moves the driver seat to the selected 1 or 2 position when the vehicle is started. Select Settings > Vehicle
  > Seating Position > Seat Entry Memory > ON or OFF. See “Auto Seat Entry Memory Recall” later in this section.
• Seat Exit Memory moves the driver seat to the preferred exit position of the B button when the vehicle is turned off and the door is opened. Select Settings > Vehicle > Seating Position > Seat Exit Memory > ON or OFF. See “Auto Seat Exit Memory Recall” later in this section.

Auto Seat Entry Memory Recall
Seat Entry Memory will automatically begin movement to the seating positions of the 1 or 2 button corresponding to the driver’s remote key number 1 or 2 detected by the vehicle when:

• The vehicle is turned ON.
• Seating positions have been previously saved to the same 1 or 2 button. See “Saving Seating Positions” previously in this section.
• Seat Entry Memory is enabled. See “Enabling Automatic Recalls” previously in this section.
• The vehicle is in P (Park).

Seat Entry Memory Recall will continue if the vehicle is shifted out of P (Park) prior to reaching the saved memory position. If the saved memory seat position does not automatically recall, verify the recall is enabled. See “Enabling Automatic Recalls” previously in this section. If the memory seat recalls to the wrong position, the driver’s remote key number 1 or 2 may not match the memory button number positions they were saved to. Try the other remote key or try saving the positions to the other 1 or 2 memory button. See “Saving Seating Positions” previously in this section. Automatic Seat Entry Memory recalls are only available for driver’s remote key numbers 1 and 2. Remote keys 3–8 will not
provide Seat Entry Memory recalls.

Auto Seat Exit Memory Recall
Seat Exit Memory will begin movement to the seating position of the button when:

• The vehicle is turned off and the driver door is open or opened within a short time.
• A seating position has been previously been saved to the B memory button. See “Saving Seating Positions” previously in this section.
• Seat Exit Memory is enabled. See “Enabling Automatic Recalls” previously in this section.
• The vehicle is in P (Park). Seat Exit Memory recall will continue if the vehicle is shifted out of P (Park) prior to reaching the saved memory position. Seat Exit Memory is not linked to the driver’s remote key. The seating position saved to Bis used for all drivers.

Cancel Memory Seating Recalls

• During any memory recall:
  Press a power seat control
  Press SET memory button
• During Manual memory recall:
  Release 1, 2, or B memory button
• During Auto Seat Entry Memory Recall:
  Turn vehicle off
  Press SET, 1, 2, or B memory buttons
• During Auto Seat Exit Memory Recall:
  Press SET, 1, 2, or B memory buttons

Obstructions
If something has blocked the seat while recalling a memory position, the recall may stop. Remove the obstruction and try the recall again. If the memory position still does not recall, see your dealer.

Heated and Ventilated Front Seats

Warning
If temperature change or pain to the skin cannot be felt, the seat heater may cause burns. To reduce the risk of burns, use care when using the seat heater, especially for long periods of time. Do not place anything on the seat that insulates against heat, such as a blanket, cushion, cover, or similar item. This may cause the seat heater to overheat. An overheated seat heater may cause a burn or may damage the seat.
Heated and Ventilated Seat Buttons Shown, Heated Seat Buttons Similar

If equipped, the buttons are near the climate controls on the center stack. To operate, the engine must be running.

• Press if available, to heat the driver or passenger seatback only.
• Press to heat the driver or passenger cushion and seatback.
• Press, if available, to ventilate the driver or passenger seat. A ventilated seat has a fan that pulls or pushes air through the seat. The air is not cooled.
• When a heated seat is turned on, the indicator on the button turns red. When a ventilated seat is turned on, the indicator on button turns blue.
• Press the button once for the highest setting. With each press of the button, the seat will change to the next lower setting, and then to the off setting. The indicator lights next to the buttons indicate three for the highest setting and one for the lowest.
• If the front heated seats are on high, the level may automatically be lowered after approximately 30 minutes.
• The passenger seat may take longer to heat up.

Auto Heated and Ventilated Seats
If the vehicle is equipped with auto-heated or ventilated seats, and the engine is running, this feature will automatically activate the heated or ventilated seats at the level required by the vehicle’s interior temperature. The active high, medium, low, or off-heated or ventilated seat level will be indicated by the manual heated and ventilated seat buttons on the center stack. Use the manual heated and ventilated seat buttons on the center stack to turn auto-heated or ventilated seats off. If the passenger seat is unoccupied, the auto-heated or ventilated seat feature will not activate that seat. To enable or disable auto-heated or ventilated seats, select Settings > Vehicle > Climate and Air Quality > Auto Cooled or Auto Heated Seats > ON or OFF. If equipped with a heated steering wheel, the auto-heated steering wheel activation will follow the heated seat auto-activation and the heated wheel indicator will follow the state of the steering wheel heat.\J HN

Remote Start Heated and Ventilated Seats
During a remote start, the heated or ventilated seats, if equipped, can be turned on automatically. When it is cold outside, the heated seats will turn on followed by the heated steering wheel, if equipped. When it is hot outside, the ventilated seats turn on. The heated or ventilated seats are canceled when the ignition is turned on. Press the heated or ventilated seat button to use the heated or ventilated seats after the vehicle is started. The heated or ventilated seat indicator lights do not turn on during a remote start.
The temperature performance of an unoccupied seat may be reduced. This is normal. To enable or disable remote start heated or ventilated seats, select Settings > Vehicle > Remote Lock, Unlock, and Start > Remote Start Auto Heat Seats or Remote Start Auto Cool Seats > ON or OFF. See Remote Vehicle Start.

Rear Seats

Rear Seat Reminder

If equipped, the message REAR SEAT REMINDER LOOK IN REAR SEAT displays under certain conditions indicating there may be an item or passenger in the rear seat. Check before exiting the vehicle. This feature will activate when a second-row door is opened while the vehicle is on or up to 10 minutes before the vehicle is turned on. There will be an alert when the vehicle is turned off. The alert does not directly detect objects in the rear seat; instead, under certain conditions, it detects when a rear door is opened and closed, indicating that there may be something in the rear seat.
The feature is active only once each time the vehicle is turned on and off, and will require reactivation by opening and closing the second-row doors. There may be an alert even when there is nothing in the rear seat; for example, if a child entered the vehicle through the rear door and left the vehicle without the vehicle being shut off.

The feature can be turned on or off.

Folding the Rear Seat Cushion
Either side of the rear seat cushion can be folded up for added cargo space.

Caution
Folding a rear seat with the seat belts still fastened may cause damage to the seat or the seat belts. Always unbuckle the seat belts and return them to their normal stowed position before folding arear seat.
Make sure that nothing is on the seat cushion.

To fold the seat, slowly pull the seat cushion up.
To return the seat to the normal seating position, slowly pull the seat cushion down.

Warning
A seat belt that is improperly routed, not properly attached, or twisted will not provide the protection needed in a crash.
The person wearing the belt could be seriously injured. After raising the rear seatback, always check to be sure that the seat belts are properly routed and attached, and are not twisted.

Heated Rear Seats
Warning
If you cannot feel temperature change or pain to the skin, the seat heater may cause burns. See the Warning under Heated and Ventilated Front Seats.

If available, the buttons are on the rear of the center console. To operate, the engine must be running.
Press M or L to heat the left or right outboard seat cushion. An indicator on the climate control display appears when this feature is on.

To adjust the seat position:

1. Remove objects on the floor in front of or on the second-row seat, or in the seat tracks on the floor.
2. Lift the lever below the seat cushion and slide the seat forward or backward.
3. Push and pull on the seatback to ensure the seat is locked in place.

Entering and Exiting the Third Row

Warning
Using the third row seating position while the second row is folded, or folded and tumbled, could cause injury in a sudden stop or crash. Be sure to return the seat to the passenger seating position. Push and pull on the seat to make sure it is locked into place.

Warning
If the seatback and floor latches are not locked, the seat could move forward in a sudden stop or crash and injure the occupant. Always push and pull on the seatbacks to be sure the seatback and floor latches are locked.

Caution
Folding a rear seat with the seat belts still fastened may cause damage to the seat or the seat belts. Always unbuckle the seat belts and return them to their normal stowed position before folding a rear seat.

Seat Belts

This section describes how to use seat belts properly, and some things not to do.

Warning
Do not let anyone ride where a seat belt cannot be worn properly. In a crash, if you or your passenger(s) are not wearing seat belts, injuries can be much worse than if you are wearing seat belts. You can be seriously injured or killed by hitting things inside the vehicle harder or by being ejected from the vehicle. In addition, anyone who is not buckled up can strike other passengers in the vehicle.
It is extremely dangerous to ride in a cargo area, inside or outside of a vehicle. In a collision, passengers riding in these areas are more likely to be seriously injured or killed. Do not allow passengers to ride in any area of the vehicle that is not equipped with seats and seat belts.
Always wear a seat belt, and check that all passenger(s) are restrained properly too.

This vehicle has indicators as a reminder to buckle the seat belts. See Seat Belt Reminders.

Why Seat Belts Work

When riding in a vehicle, you travel as fast as the vehicle does. If the vehicle stops suddenly, you keep going until something stops you. It could be the windshield, the instrument panel, or the seat belts!
When you wear a seat belt, you and the vehicle slow down together. There is more time to stop because you stop over a longer distance and, when worn properly, your strongest bones take the forces from the seat belts. That is why wearing seat belts makes such good sense.

Questions and Answers About Seat Belts
Q: Will I be trapped in the vehicle after a crash if I am wearing a seat belt?
A: You could be — whether you are wearing a seat belt or not. Your chance of being conscious during and after a crash, so you can unbuckle and get out, is much greater if you are belted.
Q: If my vehicle has airbags, why should I have to wear seat belts?
A: Airbags are supplemental systems only.
They work with seat belts — not instead of them. Whether or not an airbag is provided, all occupants still have to buckle up to get the most protection.
Also, in nearly all states and in all Canadian provinces, the law requires wearing seat belts.

Buckle To Drive
If equipped, this feature delays the vehicle from shifting out of P (Park) when the driver seat belt is not buckled. The Buckle to Drive feature must be turned ON in the infotainment system to work. To turn the Buckle to Drive feature on or off, select Settings > Vehicle > Buckle to Drive. See Teen Driver 0 182, if equipped.
If the vehicle is on and the brake pedal is pressed with the vehicle in P (Park) but the driver seat belt is not buckled, a message displays in the Driver Information Center (DIC) and the vehicle will be delayed from shifting out of P (Park). Buckle the driver seat belt to clear the message and shift out of P (Park). Shifting from P (Park) will be delayed once for each time the vehicle is started.
For some fleet vehicles, the feature is always ON and cannot be turned OFF in the infotainment system. The vehicle will be delayed from shifting from P (Park) each time the driver attempts to do so while the driver seat belt is not buckled. Turning the vehicle off then on will not change this condition.
On some models, Buckle to Drive may also delay shifting out of P (Park) if a front passenger seat belt is unbuckled. A message is displayed in the DIC. Buckle the front passenger seat belt to shift out of P (Park).
This feature may delay the vehicle from shifting out of P (Park) if an object, such as a briefcase, handbag, grocery bag, laptop, or other electronic device, is on the front passenger seat. If this happens, remove the object from the seat or buckle the seat belt to shift out of P (Park).
If the driver, or on some vehicles, the present front passenger remains unbuckled, the DIC message will turn off after several seconds and the vehicle can be shifted out of P (Park). See “Seat Belts” and “Child Restraints” in the Index for information about the importance of proper restraint use.
If the driver seat belt or the front passenger seat belt is unbuckled when driving, the seat belt reminder chime and light(s) will come on. See Seat Belt Reminders . This feature may not function properly if the airbag readiness light is on. See Airbag Readiness Light .

How to Wear Seat Belts Properly
Follow these rules for everyone’s protection.
There are additional things to know about seat belts and children, including smaller children and infants. If a child will be riding in the vehicle, see Older Children or Infants and Young Children. Review and follow the rules for children in addition to the following rules.

It is very important for all occupants to buckle up. Statistics show that unbelted people are hurt more often in crashes than those who are wearing seat belts.
There are important things to know about wearing a seat belt properly.

• Sit up straight and always keep your feet on the floor in front of you (if possible).
• Wear the lap part of the belt low and snug on the hips, just touching the thighs. In a crash, this applies force to the strong pelvic bones and you would be less likely to slide under the lap belt.
  If you slid under it, the belt would apply force on your abdomen. This could cause serious or even fatal injuries.
• Wear the shoulder belt over the shoulder and across the chest. These parts of the body are best able to take belt restraining forces. The shoulder belt locks if there is a sudden stop or crash.

Warning
You can be seriously injured, or even killed, by not wearing your seat belt properly.

Never allow the lap or shoulder belt to become loose or twisted

Never wear the shoulder belt under both arms or behind your back.

Always use the correct buckle for your seating position.

Never route the lap or shoulder belt over an armrest.

Warning
The seat belt can be pinched if it is routed under plastic trim on the seat, such as trim around the rear seatback folding handle or side airbag. In a crash, pinched seat belts might not provide adequate protection. Never allow seat belts to be routed under plastic trim pieces.

Warning
You can be seriously injured or killed if the shoulder belt is worn behind your back, under your legs, or wrapped around your neck. The shoulder belt can tighten but cannot be loosened if it is locked. The shoulder belt locks when it is pulled all the way out of the retractor. It unlocks when the shoulder belt is allowed to go all the way back into the retractor, but it cannot do this if it is wrapped around you. You may have to cut the seat belt if it is locked and tightened around you.

Lap-Shoulder Belt
All seating positions in the vehicle have a lap-shoulder belt.
The following instructions explain how to wear a lap-shoulder belt properly.

1. Adjust the seat, if the seat is adjustable, so you can sit up straight. To see how, see “Seats” in the Index.
   
2. Pick up the latch plate and pull the belt across you. Do not let it get twisted.
   The lap-shoulder belt may lock if you pull the belt across you very quickly. If this happens, let the belt go back slightly to unlock it. Then pull the belt across you more slowly.
   If the shoulder portion of a passenger belt is pulled out all the way, the child restraint locking feature may be engaged. See Child Restraint Systems. If this occurs, let the belt go back all the way and start again. If the locking feature stays engaged after letting the belt go back to the stowed position on the seat, move the seat rearward or recline the seat until the shoulder belt retractor lock releases.
   Engaging the child restraint locking feature in the front outboard seating position may affect the passenger sensing system. See Passenger Sensing System.
3. If the webbing locks in the latch plate before it reaches the buckle, tilt the latch plate flat to unlock.
   
4. Push the latch plate into the buckle until it clicks.
   Pull up on the latch plate to make sure it is secure.
   If the belt is not long enough, see Seat Belt Extender 0 52.
   Position the release button on the buckle so that the seat belt could be quickly unbuckled if necessary.
5. If equipped with a shoulder belt height adjuster, move it to the height that is right for you. See “Shoulder Belt Height Adjuster” in this section for instructions on use and important safety information.
   
6. To make the lap part tight, pull up on the shoulder belt.

To unlatch the belt, push the button on the buckle. The belt should return to its stowed position.
Always stow the seat belt slowly. If the seat belt webbing returns quickly to the shower position, the retractor may lock and cannot be pulled out. If this happens, pull the seat belt straight out firmly to unlock the webbing, and then release it. If the webbing is still locked in the retractor, see your dealer.
Before a door is closed, be sure the seat belt is out of the way. If a door is slammed against a seat belt, damage can occur to both the seat belt and the vehicle.

Shoulder Belt Height Adjuster
The vehicle has a shoulder belt height adjuster for the driver and front outboard passenger positions.

Adjust the height so the shoulder portion of the belt is on the shoulder and not falling off of it. The belt should be close to, but not contacting, the neck. Improper shoulder belt height adjustment could reduce the effectiveness of the seat belt in a crash.

Push the release button to move the height adjuster to the desired position.
After the adjuster is set to the desired position, try to move it down without pushing the release button to make sure it has locked into position.

Seat Belt Pretensioners
This vehicle has seat belt pretensioners for the front outboard occupants. Although the seat belt pretensioners cannot be seen, they are part of the seat belt assembly. They can help tighten the seat belts during the early stages of a moderate to severe frontal, near frontal, or rear crash if the threshold conditions for pretensioner activation are met.

Seat belt pretensioners can also help tighten the seat belts in a side crash or rollover event.
Pretensioners work only once. If the pretensioners activate in a crash, the pretensioners and probably other parts of the vehicle’s seat belt system will need to be replaced. See Replacing Seat Belt System Parts after a Crash.

Do not sit on the outboard seat belt while entering or exiting the vehicle or at any time while sitting in the seat. Sitting on the seat belt can damage the webbing and hardware.

Rear Seat Belt Comfort Guides
Rear seat belt comfort guides may provide added seat belt comfort for older children who have outgrown booster seats and for some adults. When installed on a shoulder belt, the comfort guide positions the shoulder belt away from the neck and head.

Comfort guides are available through your dealer for the rear outboard seating positions. Instructions are included with the comfort guides.

FAQs