My rear dome light didn't work because of a broken wire somewhere past the left taillight, a fallen apart switch in the lock and the connector fallen off the switch.
Did you put a voltmeter on both connectors at the rear window? The relay is a good possibility, but just measuring will learn what is actually wrong.
Did you put a voltmeter on both connectors at the rear window? The relay is a good possibility, but just measuring will learn what is actually wrong.