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If you plan on doing this work your self let me know. but you may have a bad connection or the connection isnt tight or a shorted wire. here is a pin out.
Instrument Lighting Fault symptoms Instrument lighting not working.Diagnostic help
Check the wiring harness Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic tool during the test.
Its in back of the I P cluster.
Its a job. here is a pdf
2003 Jetta left rear window blue plastic part of the