: $4 Fix to Door Handle Micro Switch Woes

04-04-13, 08:33 PM
Here's how you can replace those pesky switches:

Follow the handle removal steps in this thread: http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2012/228338-drivers-door-micro-switch-replacement-how.html

If you determine it is the microswitches, order a bunch of these (2/door, and get some spares): http://canada.newark.com/honeywell-s-c/zd30s20a01/submin-basic-switch-pin-plgr-spdt/dp/86R9335?Ntt=86r9335

Remove the microswitch harness from the handle. With a fine screwdriver, remove the potting the bottom of the switches. Draw a diagram of how the wiring looks, and switches are placed in the holder. Once you have removed enough potting, the switches can be pushed out of the holder by pushing up on the bottom (wire side of the switches). Unsolder the wires from the switches (you made the diagram, right?)

Here is a pic with the holder, switches removed, with new switch.

Insert the new switches into the housing. They will only fit in one direction, and their body should be flush with the housing when in completely:


Now, solder the wires accoring to your diagram.


Lastly put potting compound on the connections. Do not use silicone as some kinds can damage the connections due to acid released during the cure. My low tech potting compound was a hot glue stick (it seems to work fine). It may be beneficial to first place the switch harness back into the handle assembly, to check how the wires exiting the switch housing relate to the handle body before potting (otherwise the wires may not clear the handle body).

Installation is reverse to removal, make sure to read the note about this in the removal instructions posted at the start of this thread. Grease all plastic to plastic interfaces, it makes reassembly easier.

Enjoy your work!

04-01-15, 08:03 AM
Dear Sir.

Thank you very much for your great work. I had this trouble too. Your instuction save a lot of my time and about $90 for the new part from Cadillac. Thank you again.

04-07-15, 05:37 PM
Yeah, thanks for this. I'm chasing down this issue now to. Both front doors, 05 sts, a real pleasure. They were intermittent with the weather, now neither have functioned for a few days. I'm concerned because it seems like neither antenna is working since the back doors don't unlock when I pull the front handles.

04-18-15, 10:54 AM
I did some research last night and came up with a switch that already has the wires attached. All you need to do is splice them in.


Switch Snap Action N.O./N.C.
SPDT Pin Plunger PC Pins 3A
125VAC 1.27N Screw Mount


05-04-15, 02:47 PM
^^^Looks like theres a minimum amount you have to order for these^^^

05-04-15, 04:51 PM
Not so. I ordered a half dozen from Newark USA with no problem.

05-04-15, 05:45 PM
Newark USA?

05-04-15, 05:53 PM

05-04-15, 06:07 PM
How did you order these, it still wont let me because of the minimum is 1000 lol

05-04-15, 07:07 PM
I'm looking at switches in an envelope.
The tag says:
MFR# ZD30S20A01
SKU: 86R9335
QTY: 6

WWW.newark.com (http://WWW.newark.com)

I've been ordering from Newark for years and have never been jerked around on minimum qtys.


Go to WWW.Newark.com (http://WWW.Newark.com)

Right at the top of the page is a search box where you enter keyword/part#

Type in: 86R9335

You'll go right to a page where they show they have 551 in stock at $1.57 each.
I don't know what else I can tell you.


05-05-15, 04:05 PM
https://octopart.com/zd30sa01ea-honeywell-12338811 will sell small quantities as well but there is a minimum order surcharge if you don't buy enough stuff. Is newark the same?



what are some other uses for these micro switches? These millions of switches aren't all going into Cadillac front doors....

05-05-15, 05:13 PM
This is a generic item that has hundreds of applications. Ice machines, coffee pots, canning machinery, robots, you name it.

05-09-15, 04:38 PM
Holy crap, I actually was able to order 6 of them, AWESOME!!!