Hello Gilly:

The presenter only malfunctions on the drivers side. I know that the reverse lights don't work because I can back up to a window or another car and see the reflection; the indicator on the dash does not indicate a bulb failure.

When the presenter works, the reverse lights work. When the presenter does not work, the reverse lights don't either.

The dome light always works when the door is opened, so I know its not that switch.

Thanks for your interest.

Lee, if we work it out, no charge for the knowledge.