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As a side note, for those of you with Yukon XLs, Subs and Denali XLs, the third row seat overhead light does not have on/off reading light switches. This can be easily upgraded by ordering the second row light with switches from http://www.gmpartsdirect.com/. The part #s are 15765710 for the Tan interior, 15044370 for Shale and 15765711 for Pewter. The light runs about $21.00 plus shipping.
To install, turn off the overhead dome lamps at the dash. The old lamp is easily removed by using a small screwdriver to open the lens of the existing lamp (look for the small notch to pry the lens open). This will enable the light to simply be pulled down from the ceiling. Disconnect the wire plug from the old lamp.
Next take a pair of strong scissors and simply cut the ceiling along the lines impressed into the ceiling by the original lamp (the old lamp is smaller than the new lamp). Plug the wire connector into the new lamp and test the lamp briefly by turning on the overhead lamp switch at the dash. Reinsert the new lamp into the larger opening with the lens open. Once the lens has been closed, the new lamp with switches will be locked into place.
Its an inexpensive upgrade that will enable your third row passengers to do some reading or coloring on any long trips at night. Unfortunately, you can't perform the same upgrade on the cargo area lamp unless you run a ground wire from the third row lamp and change the wire connector to incorporate this extra ground wire.
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