A 2010 Mercedes-Benz E300 sedan with M272 engine. The vehicle Parktronic system function failure. After the vehicle is started, hanging R block, front and rear radar screen all no display, front and rear monitor buzzer does not beep, reversing lights work properly.
Diagnosis: Connect MB Star C3 use the latest Xentry software to fast diagnose the car, the test results show that the PTS system fault information storage: D12B00, with the front Parktronic system warning indicator communication failure. Into fault code, click "test" to enter guide test menu, the system will guide test between PTS control module and the front PTS warning indicator line connection, will guide test the front PTS warning indicator power supply. Tested front warning monitor supply no voltage input when reverse gear turned on. Dismantling the lines between PTS control module located right front foot well and COMAND control module, found both sides of the wires non-conductive, and warning the monitor connection color and circuit diagram shown is not the same, that feel very puzzled. Could the lines connection be wrong?
Revisit the vehicle initial detection unit find, in addition to PTS control module has the current fault code can not be cleared, there also AAC air conditioning control module exist the current fault information of interior temperature sensor communication failure. Assumed the two parts of plugs are the same, and line plug backwards. Try holding the attitude, dismantling and check the two parts control lines, and confirm the assumption situation is the actual existing problems. No wonder, because this car is just the transfer from second-hand car market. when the actual repair this failure is almost zero. After the line is reset, PTS and air conditioning function returned to normal.
For PTS system repair, have the following experience for your reference:
If there is a component failure in PTS system(such as radar sensors, warning indicator), then the whole system will stop working;
The front license plate frame installation position not good or non-standard installation will cause PTS system false alarms;
PTS system under working conditions, touch or ear close to radar probes can feel or hear fluctuations;
For vehicles equipped with parking guide function or blind spot monitoring functions and other special features, the radar sensor model of the bumper middle and both sides is not same, can not be mixed, order with EPC number as the standard.
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