Hi, A friend of mine has just purchased the woodstock DAB 54 headunit. On installing it, the Fiat Marea steering wheel interface kit he bought was working, but as soon as the headunit was fitted in place it stopped working. We checked for any obvious damage to the cables but all looks fine. He is unsure if the switch settings on the interface box are correct as the unit is not mentioned in the documentation even though it is compatible with the unit. We did try all settings described in the guide. Any help to rectify this problem would be greatly received. Thanks.