Self-test, function

Function

The PTS control unit (N62) performs a self-test when the ignition
is switched on (circuit 15 ON).

It tests:

 PTS control unit (N62)

 Center instrument panel PTS warning indicator (A44/4)

 Rear PTS warning indicator (A44/3)

 Front bumper PTS sensor unit (A42)

 Rear bumper PTS sensor unit (A43)

 All the wiring

After the self-test, both warning indicators are actuated for approx. 1 s at 60% brightness, i.e. all the LEDs light up. If there are no malfunctions or faults, this is indicated by the lighting of the standby bar in the middle of the warning indicators; the background illumination is adjusted according to the ambient brightness.

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The PTS control unit performs further self-tests at regular intervals.

The Parktronic system (PTS) distinguishes between a malfunction and a fault.

Malfunction

If a malfunction occurs during operation, it is indicated by the lighting of both red LEDs in the warning indicator concerned.There is no warning tone.

A malfunction may be caused by a defect in one of the components of the Parktronic system (PTS) or by short-term interference from outside (e.g. from a pneumatic drill on a construction site, a steam jet cleaner or an induction loop at traffic signals).

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Fault

If a self-test during normal driving continues to detect a fault, the red LEDs of the relevant warning indicator are actuated the next time the vehicle drops below 16 km/h, and a warning tone is also emitted for approx. 2 s.

After a further 20 s the Parktronic system (PTS) shuts down and the fault is stored in the fault memory of the PTS control unit.