Pics/Question for 91+ valet switch + harness question

[Corvette95]

Does anyone have a picture or currently working on any 91+ car with access to the valet switch and harness? I am starting to stash a few parts away for a project later this year. I want to know if a 91+ valet switch and pigtail can be modified to work on a 90. I plan on pulling the dash out when the weather cools off and replacing dash harness due to one of my Bose drain is broken at the CDM and causing a super low hum at idle speeds and the radio on but no volume turned up. So, yes, no one would ever notice , yes you can't hear it with any audio volume on (radio/cd playing etc), but it bugs me so going to fix it and I was thinking about swapping the valet switch (I have all the LT5 bezels I need) for a 91+ and wondered if A "would a 91+ valet switch could be pinned to work on a 1990 dash harness or B would a 91 dash harness work on my 90 with the different valet key switch. Lastly, if anyone knows, I don't think GM ever made a or offered a separate dash harness just for the 90-93 CDM? I know the rear Bose harness was available with its own part# . Thanks (Also)- anyone here have a 91+ valet switch and key for sale?

[-=Jeff=-]

Originally Posted by Corvette95

A would a 91+ valet switch could be pinned to work on a 1990 dash harness
B would a 91 dash harness work on my 90 with the different valet key switch.

A. You would not be able to pin it correctly.. using an Arduino, Raspberry Pi Pico, you could create code to emulate the function of the 1990 switch buy using a relay or Opto-isolator


B No, not that simple, Power key on the 91-95 is wired to the ECM differently than the 1990

[GOLDCYLON]

Originally Posted by -=Jeff=-

A. You would not be able to pin it correctly.. using an Arduino, Raspberry Pi Pico, you could create code to emulate the function of the 1990 switch buy using a relay or Opto-isolator


B No, not that simple, Power key on the 91-95 is wired to the ECM differently than the 1990

What -=JEFF=- said,,... plus the 91-95 had a separate power module that is attached to the back side of the Radio Surround bezel. The 90 is only a simple key switch and a totally different set up.

[Corvette95]

Thanks for the replies. I know about the valet switch module behind the bezel. That is why I thought I could swap harnesses - I have the switch . I am really looking for a NOS 90 dash harness if anyone here has one. Thanks again!