Mercedes-Benz S-class W140 - Repair manual and operation

2.6.5. Parktronic (PTS) system

PTS provides the driver with information on car distance to an obstacle. At the movement the forward course activates only front sensors.

At the movement are controlled by a backing both back, and a zone lobby.

The system joins automatically when turning a key in the ignition lock in situation 2 and remains active until the speed of the movement of the car does not exceed value in 15 km/h, - shutdown of system is also made automatically.

Repeated activation of PTS happens at reduction in the rate of the movement of the car below a boundary of 15 km/h.
There is a possibility of compulsory shutdown of PTS by means of the switch installed on vertical section of the console (see the Section Governing bodies and the equipment of salon).

Serviceability of functioning of the Parktronic system to a great extent depends on extent of pollution of the ultrasonic sensors installed on forward and back bumpers. Hindrances can bring ultrasound sources (including squeal of pneumatic brakes of trucks).

The forward zone is controlled by six ultrasonic sensors which are built in in an overlay of a front bumper (two in the middle and on two on corners), back - four sensors in a rear bumper. Range of operation of sensors makes 100 cm for the central forward sensors, 60 cm for angular forward sensors, 120 cm for the central back sensors and 80 cm for external back sensors.

The minimum admissible distance between the sensor and an obstacle makes 15 cm for angular sensors and 20 cm for central, the sensitivity threshold is broken further. You watch purity of a surface of bumpers.

Light PTS indicators

1 — the Indicator on the dashboard 2 — the Indicator in assembly of the back lamp 3 — the Frame 4 — Segments

The 3-second acoustic signal warns about dangerous approach to an obstacle during the parking of the driver, besides, special light indicators are provided on the dashboard and in assembly of the back saloon lamp. Indicators are divided into 6 yellow and 2 red segments which completeness of activation corresponds to distance to the next obstacle.

At connection of an electrical wiring of the trailer to the turnbuckle socket (at the corresponding complete set of the car) the system is automatically disconnected.

In case of violation of serviceability of functioning of PTS red segments of all light indicators of system are activated and the 3-second acoustic signal is given, - check purity of surfaces of bumpers. In case of need drive away the car on Mercedes-Benz car repair shop for performance of necessary recovery repair of system.