Trying to program it and you have to ground a wire in the computer module ccr? where is that located on a 1990 reatta

Question edited for clarity.

They all work to a similar theme. The Buick LeSabre will be close enough.

https://www.google.com/search?q=1990+Buick+Reatta.+How+to+replace+a+power+door+lock+actuator

1990 Buick Reatta Door Lock Actuator - VDO AC89312

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Feb 4, 2021 - Replacing the Door Lock Actuator on your 1990 Buick Reatta? The VDO AC89312 is a genuine replacement, with the fit of an Original Equipment ...
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This part is also sometimes called Buick Reatta Power Door Actuator. We stock door lock ... Replacement Door Lock Actuator - for 1990 Buick Reatta - 839-008 ...

Is your security light on? and the car not start? You have what is called a VATSS lockout system. There are two small wires that run from the ignition lock cylinder to the bottom of the steering column. They are notorious for getting worn right at the top from the lock cylinder turning every time you start the car. You have two choices, you can replace the lock cylinder or you can bypass the system. To replace the cylinder, you will need a competent mechanic and a lock smith or order a new part from the dealership. To bypass the system, I would recommend an audio store that installs remote start systems.

Does the AC have a charge in it, that would be the common reason for no AC in this year. Temperature control module?? no such part.

I doubt it,, but I'll do some checking for you,, most master cylinders and boosters are on the firewall on the drivers side, under the hood,,

Check & inspect bulbs and sockets on the right side front and rear. Also check the bulb and socket you just replaced.

1990 Buick REATTA Recall ID from NHTSA: 90V164000 Auto Recall Date: 09/06/1990
Vehicle Component: POWER TRAIN:AUTOMATIC TRANSMISSION:LEVER AND LINKAGE:FLOOR SHIFT
Estimated Vehicles Affected: 63964
1990 BUICK REATTA Defect Summary:
TRANSAXLE SHIFT CONTROL CABLE MAY DISENGAGE FROM THE FROM THE FLOOR SHIFT CONTROL WITH LOSS OF GEAR INDICATOR REFERENCE AND SHIFT SELECTOR OPERATION.
Defect Consequence:
DRIVER WOULD NOT BE ABLE TO DETERMINE ACTUAL GEARPOSITION THE TRANSAXLE IS IN, WHICH COULD RESULT IN UNEXPECTED VEHICLE MOVEMENTAND AN ACCIDENT WITHOUT PRIOR WARNING.
Remedy:
INSTALL A TRANSAXLE SHIFT CONTROL CABLE RETAINING CLIP TO PREVENT CABLE DISENGAGEMENT.
Notes: GENERAL MOTORS CORP., 1990 Buick REATTA Recall ID from NHTSA: 91V158000 Auto Recall Date: 09/13/1991
Vehicle Component: SERVICE BRAKES, HYDRAULIC:SWITCHES:BRAKE WARNING
Estimated Vehicles Affected: 18904
1990 BUICK REATTA Defect Summary:
BRAKE INDICATOR LIGHT MAY NOT LIGHT WHEN IGNITION IS IN THE "ON" POSITION, THE PARKING BRAKE IS APPLIED, AND THE SHIFT SELECTOR IS IN THE PARK OR NEUTRAL GEAR RANGE.
Defect Consequence:
VEHICLES WOULD NOT MEET THE REQUIREMENTS OF FMVSS 101AND 105.
Remedy:
REPLACE THE PROM IN THE BODY COMPUTER MODULE TO PREVENT THIS CONDITION FROM OCCURRING.
Notes: GENERAL MOTORS CORP., 1990 Buick REATTA Recall ID from NHTSA: 90V031000 Auto Recall Date: 02/12/1990
Vehicle Component: AIR BAGS:FRONTAL:SENSOR/CONTROL MODULE
Estimated Vehicles Affected: 857
1990 BUICK REATTA Defect Summary:
THE FORWARD SENSOR FOR THE AIR BAG MAY HAVE BEEN INCORRECTLY CONSTRUCTED WITH PART OF THE WIRING HARNESS TO THE SENSOR REVERSED.
Defect Consequence:
THE REVERSAL OF THE WIRES COULD CAUSE DELAY IN THE DEPLOYMENT OF THE AIR BAG AND INCREASE THE SEVERITY OF THE OF INJURY TO AN UNBELTED DRIVER IN AN ACCIDENT.
Remedy:
REPLACE FORWARD DISCRIMINATING SENSOR AS NECESSARY.
Notes: GENERAL MOTORS CORP.

you pcv valve should be located on the top or around the intake on top of the engine. It is covered by a little pcv valve rubber hose...it is easy to identify because it is similar to a radiator hose but a lot smaller...no where near the size of a radiator hose...but when located, the pcv valve just pulls out and to check for it being bad, shake it and it should sound like something loose inside the pcv valve (thats a good pcv valve) but what they look like, they should be a silver looking color with a small little neck on it

It may be a bad pressure switch or refrigerant temp sensor.

First, I should say that this is probably not the normal reason a horn does not operate...but, if it helps one person remedy the "non-functional horn" it will be worth the time it takes to write about it. Even though I am not a mechanic with lots of "mechanical terms", I hope I will be able to write up this "FIX" in a way that is understandable.....So here goes:
Neither horn button on my 1990 Reatta would work...power was traced to the steering wheel, but for some unknown reason there was no power getting to the button assembly. VERY IMPORTANT: We disconnected the battery and removed the Airbag Fuse and ONLY THEN did we pull the center ABS airbag module from the steering wheel..still connected to the steering wheel though.....
(Please read directions regarding Removal of the Airbag Package/Module found on the Reatta Club website, before doing this...as the directions also include a step that says to disconnect the "YELLOW" WIRE that connects to the airbag and is found under the dash...but we could not find the yellow wire and continued cautiously without disconnecting it...but I am not saying this is the proper or safe thing to do!!!!) .....then the button assemblies were easily changed (following Reatta website instructions) and still no sound. Again, the battery and fuse were disconnected and the ABS module was removed and THIS TIME, with a flashlight, we looked into the hole...in the steering wheel, where the horn harness spring wire goes... and saw that the white plastic encasement, in the lower section of the hole, had been broken and a small peice of the plastic lay across the metal in the bottom of the hole. This peice of plastic was keeping the end of the harness spring from making contact with the metal at the bottom of the hole. I wrapped tape, sticky side out, around a thin "eyeglass" screwdriver, inserted it into the hole and retrieved it out of the hole..(vaccumn clearner would probably work as well)....thus leaving the metal inside, free of obstruction. Steering ABS airbag module was then replaced in steering wheel, along with the horn harness section lowered into the hole. Battery and fuse were again connected and the car was cranked....VOILA! ...the horn buttons sounded LOUD and clear! It was a beautiful sound!!! :) As said above, this is an unusual situation, but might be something to check before replacing parts....hope it helps someone. Debbie