imagineero
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I've bought a 2009 A3 cabrio that has been in storage for a few years and has very low mileage (a little over 10,000). The car has an issue related to the steering module. The steering module part number is 8P0 953 549 F. When the car is turned on, everything works fine. But if you start the car, after 6 seconds most of the functions related to the steering wheel stop working - indicators, hi/lo beam control, wipers, MFC for radio etc. None of these will work. If you turn the ignition off and back on again, they all work just fine. They will work indefinitely, so long as you don't start the engine. As soon as you start the engine, 6 seconds and they all stop working.
So I took it to a mechanic who tested it and told me that he is getting a fault for over voltage at the steering module and that this is causing the problem. He suggested replacing the entire steering column for thousands. I tried replacing the BCM with a known working BCM and it made no difference. The next step would probably be replacing the steering module with a known working unit. Voltage while running at idle is 14.3V which seems just fine. So I have a few questions;
So I took it to a mechanic who tested it and told me that he is getting a fault for over voltage at the steering module and that this is causing the problem. He suggested replacing the entire steering column for thousands. I tried replacing the BCM with a known working BCM and it made no difference. The next step would probably be replacing the steering module with a known working unit. Voltage while running at idle is 14.3V which seems just fine. So I have a few questions;
- Is there any way of testing the steering module?
- Anyone have a pinout or a schematic available?
- Is the over voltage likely to be an internal fault of the steering module, or too much voltage coming in to the unit from somewhere?
- If I replace the steering module, do I also need to replace the slip ring? can they be separated?