oUnfortunately major disassembly of the dash is required to get at this relay. Attached is the page from the Electrical Systems Manual showing the replacement procedure (26 steps). This piece does not lend itself to testing by substitution! The last time this came up in the forum, we were able to walk the owner through enough in-place tests to prove the relay was good.
GM apparently mounted the relay by itself in an inaccessible spot to deter theft.
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