92 (88-94?) sunroof relay

[Psych0matt]

So I’ve owned my GTP for 15 years and for at least 10 of those years the sunroof has always been kinda iffy, but only on one side of the button press. I confirmed years ago that it wasn’t a button issue (and have just the other day reconfirmed), so the next step was the relay. It thought I did some decent research and ordered GM part number 21038764, which was labeled for a Saturn but also came up with many other GM makes because GM. When I went to install it, I realized the body is identical, and the insides seem to be almost identical (minus a few resistors and what appears to be a voltage regulator or something, I don’t know), but the wiring is different. I’m wondering if anyone more knowledgeable than me can confirm of the electronics are in fact the same and if I can repin the plugs and slap it in, or if there’s something different and I can’t. Alternately, if anyone knows the correct part number that would also be helpful

 

picturws attached 

 

old has the resistors. When comparing plugs, left is original, right is new one 

[Psych0matt]

Pics since they wouldn’t upload here 

https://imgur.com/a/0TaF7Mj

Link from Nate for diagram

https://charm.li/Pontiac/1992/Grand Prix V6-204 3.4L DOHC/Repair and Diagnosis/Diagrams/Electrical Diagrams/Sunroof %2F Moonroof/

Edited Sunday at 03:03 PM by Psych0matt

[Psych0matt]

It looks like the end plug is wired the same (looks like power?) but has a different connector, and the second to last one as well and has the same connector, so the main difference is on the original the first plug (that goes to the stop switch) has three wires, but on the new it only has 2, with the third wire going to the second plug instead; both of those having different connectors as well. I’d bet this would function the same if repinned/spliced to the correct connectors. Some are different sizes so I don’t think I can just reuse the end connectors without splicing 

Edited Sunday at 03:10 PM by Psych0matt

[Psych0matt]

Here’s the diagram for the Saturn part number I ordered. Posting here so I can compare it later (currently at work in the John haha)

 

https://charm.li/Saturn/1995/Sedan L4-1.9L SOHC VIN 8/Repair and Diagnosis/Diagrams/Electrical Diagrams/Sunroof %2F Moonroof/

[Schurkey]

HOW does the relay know which side of the button you're using?

[55trucker]

2 hours ago, Schurkey said:

HOW does the relay know which side of the button you're using?

The sunroof switch is a rocker switch, depending on which side of the switch one presses (front side or rear side) the switch closes the circuit to either the forward relay or the back relay. The direction of sunroof movement remains in play until the end of stroke as long as one has the switch pressed. If the sunroof glass has been opened & one presses the front side of the rocker switch the glass moves forward to the closed position, one releases the switch at the point the glass is closed to keep the glass closed, if one continues to hold down the front side of the switch the glass will open up to the vent position. The same control function takes place when retracting the glass to full open, when the glass goes to full open the glass stops moving, the load comes up on the motor circuit, no voltage is flowing, so both relays go open, this same action applies when the vent goes to fully open.