I found the source of the ticking sound coming from the glovebox area of my '90 DeVille. I could reel the relay pulsing when it "ticks". The ticking sound corresponds to the clock, HVAC, and Fuel Data Center lights flashing off and on.
This relay has a mini-wiring diagram on it; circuits 30, 85, 87a, 87, and 86.
Can anyone identify these circuits? Is this relay a dealer-only item? Expensive to replace?
Thanks in advance.
Matt

That is supposed to say: I can FEEL the relay (pulsate with my finger) when it "ticks".