Parking Assist - Malfunction and Fault Scenarios

Mercedes Benz C 250 4MATIC (204.085) (CAN) V6-2.5L (272.911) Technical Service Bulletin # S-54_65-252 Date: 120207

Parking Assist - Malfunction and Fault Scenarios

Date: February 7, 2012

Order No.: S-B-54.65/252

Group: 54

SUBJECT:

MY-All, Models 163, 164, 166, 170, 171, 172, 197, 202, 203, 204, 207, 208, 209, 210, 211, 212, 215, 216, 218, 219, 220, 221, 230, 231, 240, 245,

251, 463 with Code 220 Parktronic system (PTS); Code 230 Advanced Parking Guidance; Code 235 Active Park Assist

2010 Mercedes Benz C 250 4MATIC (204.085) (CAN) V6-2.5L (272.911) Page 42

Parktronic Malfunctions and Faults

This is an overview of Parktronic malfunction and fault scenarios, respectively.

Malfunction Scenario 1

Malfunctions are indicated with double red (4 LEDs) warning elements and no warning tone (Figure 1).

An entry is not saved in fault memory.

Malfunctions can be triggered by external ultrasonic signals:

^ Compressed air

^ Drier blower for a washer system

^ Rail vehicles

^ Brake squeal on vehicle or a nearby vehicle

Or through:

^ Soiling of sensors with ice or snow

^ License plate brackets

Fault Scenario 2

Faults are indicated in the Parktronic warning elements with double red (4 LEDs) with warning tone (Figure 1) (see arrows).

An entry is saved in fault memory.

The sensor function is automatically checked while driving at between 22-37 mph. If a fault occurs when driving, then this is issued at a speed less

than 9 mph with double red lights and warning tone.

The following applies to both scenarios:

If a malfunction or a fault is present for more than 2 seconds, the display in the warning elements goes out and the PARKTRONIC OFF button in the

UCP lights up in red.

Diagnosis

2010 Mercedes Benz C 250 4MATIC (204.085) (CAN) V6-2.5L (272.911) Page 43

To fix issues that cannot be clearly located via fault codes in fault memory, check for correct and central installation (Figure 3) (C) or for any

damage caused by stone chipping (Figure 2) (A) (B).

The decoupling ring must be centered and custom fit when installed (Figure 3) (C) and Figure 4 (C). Refer also to S-B-54.651251 Parktronic Sensor