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Switch in windscreen frame latch

Switch in windscreen frame latch

To ensure that the soft top is secured to the windscreen frame when the car is being driven and released when being operated, there are two reed switches that detect whether the soft top is mechanically locked to the windscreen frame or not.

The switches consist of a reed switch and a permanent magnet on each side. The reed switches are located in the latch fittings in the windscreen frame. The permanent magnets are located by the lock hooks on the first bow and their magnetic fields affect the switches when the first bow is locked to the windscreen frame.



Pin 3 on the left switch is connected to control module pin 34 and pin 2 is connected to grounding point G36. Pin 3 on the right switch is connected to control module pin 19 and pin 2 is connected to grounding point G36.

When the ignition is turned to the ON position, the control module outputs B+ via a 1 kOhm resistor to the switches from pins 34 and 19, and when the soft top locks the permanent magnets activate the switches which then close and the control module inputs are grounded.

Diagnostics

If the soft top is locked to the windscreen frame and an attempt is made to operate the roof, the control module sends bus messages “Sound” and “Text information”, whereby SID sounds an acoustic signal at the same time as it displays “CHECK SOFT TOP LATCHES”.

If the soft top is not locked and the car is driven at speeds exceeding 10 km/h, the control module sends bus messages “Sound” and “Text information”, whereby SID sounds an acoustic signal at the same time as it displays “CHECK SOFT TOP LATCHES”.