Mercedes-Benz C300 Headrest Reset: Method Steps

For many Mercedes-Benz C300 models, especially older C-Class models such as the W204 generation, “headrest reset” usually refers to resetting the NECK-PRO active front head restraints after they have been triggered. NECK-PRO is a Mercedes-Benz safety system designed to help reduce neck injury in certain rear-end collisions. When triggered, the front head restraints move forward and upward to better support the driver’s and front passenger’s head and neck. Mercedes-Benz states that after NECK-PRO has been triggered, the head restraints must be reset; otherwise, the additional protection may not be available in another rear-end collision.

1. Standard NECK-PRO Headrest Reset Procedure

This procedure applies to the standard NECK-PRO head restraint design used on some Mercedes-Benz C-Class/C300 models.

Park the car safely, switch off the engine, and make sure the front seats are not moving. Stand beside the front seat and support the head restraint cushion firmly with both hands.

Step-by-step reset:

1. Tilt the top of the NECK-PRO head restraint cushion forward.
   Pull or tilt the upper part of the cushion forward first.
2. Push the head restraint cushion downward as far as it will go.
   This may require a lot of force. Mercedes-Benz notes that resetting NECK-PRO head restraints can require significant strength.
3. Push the cushion firmly backward until it locks into place.
   You should feel or hear the cushion engage. The head restraint should no longer remain pushed forward.
4. Repeat the same procedure on the other front head restraint.
   If one head restraint has been triggered, Mercedes-Benz instructs that the procedure should be repeated for the second NECK-PRO head restraint as well.

After resetting, check that both front head restraints are securely engaged and can be adjusted normally.

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2. NECK-PRO Luxury Headrest Reset Procedure

Some C300 models may have NECK-PRO luxury head restraints, which use a different reset method. According to the Mercedes-Benz C-Class operator’s manual, this version uses a resetting tool stored in the vehicle document wallet.

Step-by-step reset:

1. Remove the resetting tool from the vehicle document wallet.
2. Slide the tool into the guide between the NECK-PRO luxury head restraint and the rear cover of the head restraint.
3. Push the tool downward until the deployment mechanism engages.
4. Remove the tool.
5. Firmly press the head restraint cushion backward until it locks.
6. Repeat the same procedure for the second front head restraint.
7. Put the resetting tool back into the vehicle document wallet.

If the tool is missing, the head restraint does not lock, or the mechanism feels jammed, the safest choice is to have the work done by a qualified Mercedes-Benz repair facility.

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3. Normal Headrest Adjustment Is Different From NECK-PRO Reset

A normal headrest adjustment is not the same thing as a NECK-PRO reset. On later C-Class/C300 models, the head restraint may simply need to be adjusted for height or distance from the head.

For normal manual adjustment, Mercedes-Benz describes raising the head restraint by pulling it upward, lowering it by pressing the release catch and pushing it downward, and adjusting the fore-and-aft position by pulling the head restraint forward or pressing the release catch while pushing it back. The manual also states that the head restraint should be as close as possible to the occupant’s head.

For models with electric seats, the head restraint height may be adjusted using the seat adjustment switch. The 2018 C-Class manual shows the head restraint height as part of the electric seat adjustment controls.

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4. Correct Final Position

After resetting or adjusting the headrest, the center of the head restraint should support the back of the occupant’s head at about eye level. Mercedes-Benz warns that incorrectly installed or incorrectly adjusted head restraints may not provide the intended protection and can increase the risk of head or neck injury in an accident or during hard braking.

A good final check is:

The headrest should be locked securely.
The cushion should not remain stuck forward.
The height should match the occupant’s head level.
The headrest should be close to the back of the head.
There should be no warning light or SRS/airbag fault related to the seat system.

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5. When You Should Not Force the Reset

Do not force the headrest if it will not move, will not lock, is uneven, makes abnormal noises, or if the car has an SRS/airbag warning light. Also avoid forcing it if the vehicle was recently involved in a collision. Mercedes-Benz specifically advises using a qualified specialist workshop, such as an authorized Mercedes-Benz Center, if resetting is difficult.

In simple terms: if it feels stuck, broken, or unsafe, stop and have it inspected.