Parking Assist Control Module: Description and Operation

GF54.65-P-5000GZ Parktronic System (PTS) Control Unit, Component Description
- with CODE (220) Parktronic system (PTS)






Location
The PTS control unit is located below the driver seat.

Task
- The PTS control unit takes over the Voltage supply of the sensors and warning elements.
- Evaluation of echo journey times
- Bidirectional data transfer from and to the warning elements
- Dimming of warning elements
- The PTS control unit takes over the actuation of the following sensors:
- Outer left front PTS ultrasonic sensor (B8/1)
- Center left front PTS ultrasonic sensor (B8/2)
- Inner left front PTS ultrasonic sensor (B8/3)
- Inner right front PTS ultrasonic sensor (B8/4)
- Center right front PTS ultrasonic sensor (B8/5)
- Outer right front PTS ultrasonic sensor (B8/6)
- Outer right rear PTS ultrasonic sensor (B8/7)
- Inner right rear PTS ultrasonic sensor (B8/8)
- Inner left rear PTS ultrasonic sensor (B8/9)
- Outer left rear PTS ultrasonic sensor (B8/10)

Function
The PTS control unit is the central unit of the Parktronic system.
The PTS control unit calculates the distance between the vehicle and obstacle from the runtime of the echos and actuates the warning indicators.

The PTS control unit carries out a self-test after the ignition (circuit 15 ON). The control unit, the sensors plus all the lines to the sensors, the warning elements, as well as the lines to the warning elements. After the self-test all the warning indicators are actuated fully for approx. t = 1 s.

Function requirements:
- Circuit 15 ON
- If the speed drops below v = 40 km/h (Parktronic system is supplied with voltage) or drops below the lower limit speed vu = 16 km/h (Parktronic system activated)

Discrete inputs and outputs
- PTS ultrasonic sensors
- PTS warning indicator, driver side instrument panel (A44/1)
- Rear dome lamp PTS warning indicator (A44/3)

For exchange of data the PTS control unit is connected to the Controller Area Network-bus class B (interior) (CAN-B)

Inputs via CAN-B
- Intelligent servo module for DIRECT SELECT reverse gear signal (A80)
- Terminal status from EIS [EZS] control unit (N73)
- Vehicle speed from instrument cluster (A1)
- Day/night detection by rain/light sensor (B38/2) via overhead control panel control unit (N70)
- Signal of parking brake indicator switch (S12) from front SAM control unit (N10)
- Signal on manual deactivation of the Parktronic system (PTS) from PTS OFF switch (N72/1s8) in the upper control panel control unit (N72/1) on vehicles except code 228 Stationary heater, with code 430 Offroad package.
- Signal on manual deactivation of the Parktronic system (PTS) via the menu on the 1st level of the instrument cluster (ON/OFF) on vehicles with code 228 Stationary heater, except code 430 Offroad package.

Outputs via CAN-B
- Signal for muting the audio components on the COMAND operating, display and controller unit (A40/3).