Thanks, Bob, for resurrecting this old, but interesting thread!
If an internal auditor doesn't engage with top management in the planning phase of the audit, what value is being lost? It's common, isn't it, for the internal audit program not to be on top managements' radar screen. As a result, what happens? No support for findings, no escalation for actions, no budget for the improvements found.
I learned (a few years ago) while riding around Detroit, listening to Dr. Joy Brown (a qualified clinical Psycologist and engineer) that if you want someone to behave different, especially if what they do offends/annoys you, that you have to be prepared to do something different as well.
I hear all kinds of internal auditors complain about 'management doesn't help, support or get involved in the audit'. My response - what did you do to involve them? And I don't mean inviting them to the opening and closing meetings, either!!
Your audits have to address things that are on their radar screens. What's topical, keeping them awake at night. Not because "ISO-says-so" and doing calibration in December because you CB auditor bought off your audit plan isn't a great reason to schedule an audit.
So the answer to the OP (back all those years ago)? You'd better engage management early in the planning process and keep them involved throughout the audit - by making it looks for the results they want/need to see.. They have no more idea what to expect from audits than you did going into auditor training, so help them out!!