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I'm trying to diagnose an alarm double beep issue and a "gone crazy" central locking switch. Part of the troubleshooting steps involve testing the switch, which is supposed to have 5Ω between two of its terminals when the switch is activated, and ∞ when not activated. Assuming I've read the writing diagram correctly to get the pin numbers of the switch, this does not seem to be the case. The local dealer does not have a replacement switch in stock, and I was thinking of trying one of the other switches with a built-in LED (like the PSM one) instead. So my question is are all of the switches with the built-in LED electrically the same? Obviously, I can test the function of the PSM switch using a multimeter to verify, but thought I'd ask here first.

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The answer seems to be no when I check with a multimeter. Also the switches themselves have different numbering (not the part number, which is obviously different): 01 50 1 for the central locking switch and 01 51 1 for the PSM switch.


On my central locking switch, I get the following when the switch is not actuated:

Pins 1 & 4: open circuit.

Pins 2 & 4: open circuit


With the switch actuated, I get:

Pins 1 & 4: 0 Ohms

Pins 2 & 4: open circuit


I've double checked that I'm measuring the correct terminal numbers - they are marked on the switch itself in tiny numbers.

Edited by David Sayed
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