Just an additional note on this topic. A friend had a similar problem that turned out to be unrelated to the dash electronics. It seems that the seatbelt warning light is on the same fuse. The fault was eventually tracked down to a bare wire near the seat connection. It was occasionally touching the seat rail and shorting out.

This will not be the OP's problem as his fuse is blowing when he turns the switch for the heater fan to high.

Peter

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