Trailer Maneuvering Stabilization, Basic Function - GF54.65-P-1008A

Model All (4xWD) 

With Code 553 (Trailer Assist) 

Model All (CAR) 

With Code 553 (Trailer Assist) 

Overview 

This document contains information on:

• General 
• Function requirements 
• Function 
  • Determining articulation angle 
  • Articulation angle protection 
  • Straight towing maneuver 
  • Display screen 
  • Camera perspectives when trailer maneuvering stabilization is active 

General 

Trailer maneuvering stabilization supports the driver river during reversing maneuvers with a trailer. The trailer maneuvering stabilization is operated using the multimedia system.

Function requirements 

• Engine running or drive train operational.
• Parking Assist switched on.
• Trailer detected.
• Reverse gear engaged.
• Incline less than 15%.

Function 

Trailer maneuvering stabilization is taught-in by briefly driving the vehicle combination (vehicle and trailer) forward and, while doing so, angle measurement is reset to zero.

The drawbar length of the trailer is then calculated during cornering.

The parking system control unit takes over control of the trailer maneuvering stabilization function.

The parking system control unit receives the necessary information for this from the following components:

• The engine management control unit sends information about the running engine.
• The trailer recognition control unit provides information about an existing trailer.
• The supplemental restraint system control unit indicates the speed, turn rate and lateral acceleration.
• The Electronic Stability Program control unit also forwards the wheel speed.
• The camera for the rear 360° camera provides picture data.
• The steering column tube module control unit provides information about the hands-on detection.
• The head unit operates the trailer maneuvering stabilization.

Depending on the model, the parking system control unit outputs the picture data via the touchscreen or the head unit/instrument cluster display cluster. As soon as necessary, the parking system control unit regulates the vehicle speed via the Electronic Stability Program control unit. Depending on the equipment installed, the function is supported via the electrical power steering control unit or via the rear axle steering control unit.

Determining articulation angle 

Depending on the model series and model year, the actual articulation angle is determined as follows:

• Through a rotating magnetic ring of the turning angle sensor in the ball head of the trailer coupling,
• or through visual recognition by the reversing camera.

The nominal articulation angle of the vehicle combination (nominal lane (11)) is entered by the driver manually using the multimedia system.

Trailer maneuvering stabilization controls the vehicle combination through targeted steering movements to match the nominal articulation angle entered by the driver.

Here, the speed of the vehicle combination is reduced or limited to 7 km/h (articulation angle ≤ 5°) or 5 km/h (articulation angle > 5°).

If the driver grasps the steering wheel, the vehicle combination is brake to a standstill.

Articulation angle protection 

If the articulation angle is too large the articulation angle protection is initiated. The vehicle combination is automatically braked to a standstill, when the articulation angle between the towing vehicle and the trailer is too large.

Straight towing maneuver 

When the straight towing maneuver function is activated using the multimedia system, the vehicle is regulated such that the trailer's current direction is maintained.

The trailer maneuvering stabilization automatically calculates the articulation angle and aligns the vehicle combination to match the trailer's current direction.

When reversing, the trailer swings out briefly before returning to the required line. The vehicle is aligned to be straight relative to the trailer. The trailer direction is maintained.

Example illustration of specified track 

Courtesy of MERCEDES-BENZ USA

Display screen 

The depiction in the central display is realized by the 360 degree camera system. The cameras record the required field of view. The driver is shown the trailer's current and specified articulation angle. The displays support the driver when maneuvering.

Various angles of vision (e.g. top view with view of trailer or top view with image from reversing camera) are shown.

Camera perspectives when trailer maneuvering stabilization is active 

Exemplary illustration of top view with reversing camera image 

Courtesy of MERCEDES-BENZ USA

Exemplary illustration of top view with reversing camera image 

Courtesy of MERCEDES-BENZ USA

	Function schematics
	Trailer maneuvering stabilization, function schematic	Model 167	PE54.65-P-2507-97A
		Model 213 as of model year 2021	PE54.65-P-2507-97B
		Models 206, 214, 223, 253, 254, 257, 294, 295, 296, 297	PE54.65-P-2507-97C
	Additional basic functions
	Torque coordination, basic function		GF07.10-P-1060A
	Direction of travel selection, basic function	Electric vehicles	GF08.00-P-1002A
	Gearshift system, basic function	All models with transmission 725.0/1	GF27.60-P-1002B
	Steering, basic function		GF46.35-P-9900A
	360 degree camera picture display, basic function	All models (cars) with code 501 (360° camera)	GF54.65-P-1004A
	Trailer recognition control unit, basic function		GF31.19-P-9890A
	Head unit/instrument cluster displays, basic function		GF54.30-P-2005A
	Instrument cluster control unit, basic function		GF54.30-P-9891A
	Parking system control unit, basic function	All models (cars) with code 235 (Active Parking Assist)	GF54.65-P-9890A
	Head unit control unit, basic function	All models (cars) except 545 (Connect 5 (NTG6))	GF82.85-P-9891A