Environment Monitoring, Basic Function - GF54.65-P-1000A

Model All (4xWD) 

With Code 235 (Active Parking Assist) 

Model All (CAR) 

With Code 220 (PARKTRONIC system (PTS)) 

Model All (CAR) 

With Code 235 (Active Parking Assist) 

Example illustration of environment monitoring 

Courtesy of MERCEDES-BENZ USA

Overview 

This document contains information on:

• General 
• Function requirements 
• Function 
  • Display with detected obstacle 
  • Functional restrictions 

General 

The environment monitoring system scans the area around the vehicle with the aid of distance sensors in the front and rear bumpers.

Environment monitoring is automatically switched on at "ignition on". It can be switched off and on manually.

Function requirements 

• Circuit 15 ON.
• Vehicle speed 0 to 18 km/h or 16 to 0 km/h (calculated using wheel speed).
• Backward movement of vehicle (defined via the wheel rotation direction) - environment monitoring while reversing.
• Distance of half of the vehicle's length (defined by the wheel rotation direction) - passive side guard environment monitoring.
• No trailer detected (vehicles with trailer hitch) - environment monitoring while reversing.

Function 

Environment monitoring is based on the ultrasound measurement method. The distance sensors transmit ultrasonic waves. The ultrasonic waves reflected by an obstacle are received again by the distance sensors.

When reversing, the areas in front of and behind the vehicle are monitored.

During forward travel, the area in front of the vehicle is monitored. Side obstacles are detected when the vehicle is driving past if they were detected first by the side sensors in the front and rear bumpers. Ambient monitoring is in measuring mode at speeds below 10 km/h.

When objects are detected within the detection range of the distance sensors (A), the driver is warned by the respective warning segments in the multimedia display illuminating and, at close range, a warning tone.

The vehicle must cover at least the distance of half its length for side display. The side warning is only issued if the steering movement is toward the obstacle.

When the speed exceeds the limit speed of 12 km/h, the environment monitoring system switches back to standby mode.

If a trailer is detected (on vehicles with a trailer hitch, the electrical connection is established between the vehicle and the trailer), the environment monitoring function is deactivated for the rear.

Example illustration of multimedia display 

Courtesy of MERCEDES-BENZ USA

Display with detected obstacle 

If Active Parking Assist is not switched on and an obstacle is detected in the vehicle's path, a pop-up window (14) appears in the multimedia display at speeds up to 10 km/h.

The system can display an obstacle at the sides on the multimedia display (passive side guard). The area at the side of the vehicle between the effective areas of the sensors is determined using a computer model. The system must have fully detected the obstacle at selector lever position D, R or N.

Functional restrictions 

The environment monitoring system does not recognize the following obstacles:

• Obstacles below the detection range, e.g. animals or objects
• Obstacles above the detection range, e.g. protruding load, overhangs or loading ramps of trucks

	Function schematics
	Monitor surroundings, function schematic	Model 465 with code 235 (Active Parking Assist)	PE54.65-P-2500-97E
		Model 118 up to model year 2023 with code 235 (Active Parking Assist) Model 167, 243, 293 with code 235 (Active Parking Assist) Model 177, 247 up to model year 2022 with code 235 (Active Parking Assist) Model 213, 238, 257, 290 as of model year 2021 with code 235 (Active Parking Assist) Model 213, 238, 257 as of model year 2021 with code 220 (PARKTRONIC system (PTS))	PE54.65-P-2500-97A
		Model 223, 297	PE54.65-P-2500-97B
		Model 192, 206, 214, 232, 236, 254, 294, 295, 296	PE54.65-P-2500-97C
		Model 118 as of model year 2023 with code 235 (Active Parking Assist) Model 177, 247 as of model year 2022 with code 235 (Active Parking Assist)	PE54.65-P-2500-97D
	Additional basic functions
	Parking system control unit, basic function	All models (GW, cars)	GF54.65-P-9890A
	Distance sensor, basic function	All models (GW, cars)	GF54.65-P-2001A