I fear I have a bad headlight switch on my '92 S4. The headlights go on fine, but the high beams do not go on in the flash position. WD-40 didn't help. What is involved in replacing the switch--is it just the switch or the whole unit fitting between the steering wheel and the dash (steering column)? TIA for any help. Andrew '92 S4 '90 80Q '85.5 944