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I have a 996 4S MY 04 with PSE factory installed. One year ago, I had disconnected the speedometer A signal and this worked perfect so far!

Under some conditions, I need to manually turn to quiet mode sometimes. However, the flaps close for some seconds and turn back to loud mode again. First, I thought, this is a vacuum problem. But when the flaps move back to loud, also the dashboard LED is off. If I would have a vacuum leak, the LED would remain on.

So, in my opinion, this can only be a electrical problem, probably either the switch or the relay. How can I figure out, what exactly the problem is?

What happens inside the relay? How can I test it without the switch?

Thanks, Gert

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But isn´t it more likely a relay problem, since the switch LED goes off, when the flaps open! That means for me, that the solenoid is not even energized!

Beside the speedcontrol, I guess the Relay works like an ELTAKO relay! With each 12V impulse from the switch it energizes / deenergizes the terminals to the LED A4 and to the valve A5.

Or am I completely wrong?

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