Welcome to JustAnswer, I'm Neal and I am here to assist you. Please feel free to ask follow up questions, it is part of the process.
Here is the location of the convenience center and the location in the convenience center.
Probably more than you need, let me know how it goes.
In the second diagram in the lower right is that a fuse and not a relay?
I see so many I can't remember them all and there is not one here right now with that same box.
I am seeking the location of the power lovk relay in an 88 chevy silverado
Should be a Flat Type GM Relay above the Gas Pedal or on the Support above Brake PedalIt will have ORANGE, GRAY, BLACK, TAN & a couple of other wiresIt does NOT look like a conventional Square Relay
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There were "two" methods used:Relay & Direct Switch, (that reversed the voltage & ground)
If there is no Relay in the position I posted, then you need to "back probe" the ORANGE / BLACK wire from the Driver Door Switch to the Convience Center "PWR LK"Then from "PWR LK" to the ORANGE / WHITE wire to the "ACC / BATT" Fuse in the Fuse Panel
The Door Switch "Reverses" the Voltage + & Ground -
At the Door Lock Actuator "two" wires
When the Switch is moved to the UNLOCK Position there will be Voltage +, on one wire & Ground - on the other wireWhen the Switch is moved to the LOCK Position, the wire that had 12 Volts + is now Ground -The wire that had Ground - is now 12 Volts +