Hi,
I attached a pic below of the map lamp wiring. If you notice, there are two grounds indicated, one for the left and one for the right. Rhwew also appears to be only one power supply, a light blue wire.
Using a test lamp, check the light blue wire on the right side that supplies power. See if power is available for the lamp.
If there is power, the opposite side of the connector should be ground. See if we have continuity to ground via that wire.
Here is a link you may find helpful as well:
https://www.2carpros.com/articles/how-to-check-wiring
Let me know. Also, there will be a white wire as well. From what I can tell, it appears to be an additional ground tied into the rear map lamps. See if it has power or ground and let me know what you find. See pic 2 for lamp switch positions.
Joe
See pic below.
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Wednesday, March 1st, 2023 AT 7:53 PM