Self-test, function - GF54.65-P-2000GZ

MODEL 164.1/8 with CODE (220) Parktronic system (PTS) up to Model Year 2008 

Function 

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

The following are checked:

• PTS control unit
• PTS warning indicator, driver side instrument panel (A44/1)
• Rear dome lamp PTS warning indicator (A44/3)
• Front PTS ultrasonic sensors
• Rear PTS ultrasonic sensors
• 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.

The PTS control unit performs further self-tests at regular intervals. In this process the Parktronic system (PTS) distinguishes between a malfunction and a fault.

Malfunction 

If a warning indicator receives no valid signals within t = 0.5 seconds of the ignition being switched on, the two red LEDs of the relevant warning indicator light up and a warning tone sounds. After t = 20 s the warning display is switched off.

A malfunction can be caused by a defect in a component of the Parktronic system (PTS) or a short-term interference from outside (e.g. an induction loop at traffic lights).

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 speed falls below 16 km/h and a warning tone also sounds for approx. 2 seconds.

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.

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