Question About Driver's Door Latch Module Operation Re: Window Indexing - Chevy SSR Forum
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post #1 of 18 (permalink) Old 04-05-2019, 01:17 AM Thread Starter
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Question Question About Driver's Door Latch Module Operation Re: Window Indexing

Hi everyone...

On my driver's door when you open the exterior door handle, the window will NOT go down no matter how hard you pull the door handle...UNTIL the door actually starts to open. Then, the window will index down every time without fail. It has been like this since new.

The passenger door, the second you move the door handle the window indexes down whether the door is opening or not.

The problem that this causes on the driver's door is that the window always catches on the rubber for a split second when you open the door. It isn't just a time delay. It will NOT index no matter what you do until you actually move the door itself, and the window ALWAYS drops the very instant the door itself starts to move. However, even if you open the door handle as hard as you can (without opening the door), you can stand there and hold it for over a minute and the window will NOT index. If you move the door outward just a few millimeters, the window will index!

I've even tested it by holding the door handle open as far as possible, absolutely not changing pressure, and having someone else pry the door open...the window only indexed the second the door moved, so it isn't a change of pressure on the door handle. And, it works like this all the time...it never changes behavior as if a switch was dirty.

I don't know how this can be...I don't think there is an inertia sensor in the module, and again no matter how hard I pull the door handle (without opening the door) the window will NOT go down.

How is this module supposed to work? I thought the indexing was only tied to the opening of the door handle itself and not the door...but on my truck this seems like it isn't the case.

Any ideas? I don't want the neverending catching on the rubber when opening the door to mess up my finally well-adjusted window.

Thanks!
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post #2 of 18 (permalink) Old 04-05-2019, 02:22 AM
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I’ll say this, the condition you are describing is the same as when the latch becomes internally corroded and doesn’t properly sense the handle movement. I had one latch transition from occasionally not indexing when opening, to all the time not indexing until the door moved slightly. At that point to shut the door and have the window inside the seal, i had to almost shut the door and let it index down, then quickly shut it. After replacing the latch with a rebuilt one, all good.

Here’s a link to a good discussion with relevant info:
https://www.ssrfanatic.com/forum/f5/...-locks-245607/

I’d check the top wire connector on the latch and checkout Dicktator's library.

The other possibility is a broken wire not making contact until the door moves. The “since new” part is troubling and makes me consider this more than I would normally. Dicktator told me the broken wire happened on his truck.

Reach out to @Dicktator or @Mike in AZ , if they don’t comment here.

- Robert
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post #3 of 18 (permalink) Old 04-05-2019, 01:46 PM Thread Starter
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Quote:
Originally Posted by TXNSSR View Post
The other possibility is a broken wire not making contact until the door moves.
So there IS something that senses when the door actually moves to index the window?

Again, I can hold that handle perfectly still, wide open, with absolutely no change in tension for over a minute. The window won't move. Then, I have someone pull open the door slightly from the metal part of the door...the instant the door moves any tiny bit, the window indexes.

How does the latch know the door is opening in that way?
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post #4 of 18 (permalink) Old 04-05-2019, 02:24 PM
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Quote:
Originally Posted by ggoat!!! View Post
So there IS something that senses when the door actually moves to index the window?
No, there is not. When you pull on the handle the latch mechanism sends a signal to the RDM which lowers the window. The signal goes to the RDM through the top connector on the latch mechanism. Probably there's a bad connection in that connector or in the wire that makes contact when you move the door. Go to Dicktator's write up for details.

Often wrong...... but never in doubt.
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post #5 of 18 (permalink) Old 04-05-2019, 02:39 PM Thread Starter
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Oh OK...but I still don't see how not physically moving the latch at all but having someone else open the door makes the window index.
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post #6 of 18 (permalink) Old 04-05-2019, 02:50 PM
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Quote:
Originally Posted by ggoat!!! View Post
So there IS something that senses when the door actually moves to index the window?

Again, I can hold that handle perfectly still, wide open, with absolutely no change in tension for over a minute. The window won't move. Then, I have someone pull open the door slightly from the metal part of the door...the instant the door moves any tiny bit, the window indexes.

How does the latch know the door is opening in that way?
Yes, the door lock senses the position of the handle, when it gets to a certain position it tells the RDM to drop the window. I wrote a "how to" article a few years ago on it. And yes, Dick and I repair them, most likely some corrosion internally, see the link for pictures and information I provided for the forum ........

https://www.ssrfanatic.com/forum/f5/...repair-157210/

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post #7 of 18 (permalink) Old 04-05-2019, 02:51 PM
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You are moving the latch when you pull the handle, otherwise your buddy wouldn't be able to open the door, would he?
But the signal to lower the window isn't getting to the RDM until you move the door, so it has to be a bad connection at the connector on the latch mechanism or in the wire. When you move the door the trouble spot makes contact and it works.

Often wrong...... but never in doubt.
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post #8 of 18 (permalink) Old 04-05-2019, 02:55 PM Thread Starter
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Quote:
Originally Posted by xoxoxoBruce View Post
You are moving the latch when you pull the handle, otherwise your buddy wouldn't be able to open the door, would he?
But the signal to lower the window isn't getting to the RDM until you move the door, so it has to be a bad connection at the connector on the latch mechanism or in the wire. When you move the door the trouble spot makes contact and it works.
I understand that. But...

I pull the handle. Nothing happens. I hold it absolutely still for over 1 minute. Nothing happens. I don't move the handle at all, hold it absolutely still. The latch is still open. Then I have someone move the door 1 mm with no movement from me on the handle. The window will index.
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post #9 of 18 (permalink) Old 04-05-2019, 02:58 PM
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When you pull the handle nothing happens BECAUSE YOU HAVE A BAD CONNECTION IN THE WIRING!

Often wrong...... but never in doubt.
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post #10 of 18 (permalink) Old 04-05-2019, 03:30 PM
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Quote:
Originally Posted by ggoat!!! View Post
So there IS something that senses when the door actually moves to index the window?

Again, I can hold that handle perfectly still, wide open, with absolutely no change in tension for over a minute. The window won't move. Then, I have someone pull open the door slightly from the metal part of the door...the instant the door moves any tiny bit, the window indexes.

How does the latch know the door is opening in that way?
ggoat!!!, My '06, 28,000 miles, I've had 5 years, never in the rain, washed once, by hand, kept in the shop, does the same thing since I bought it. Pull the handle, inside or outside, latch releases, pops open just a hair, from seal pressure maybe, but no index!! Bump with elbow or move just a hair from the outside and it indexes. I haven't done anything to resolve it just do what works. After reading all of this today my thought is, maybe, the Pawl/latch is releasing enough to open the door, BUT NOT quite enough to activate the switch. Maybe the latch or a linkage rod is dry/sticky enough to not complete it travel. Try spraying the latch good like was posted somewhere about "Maintenance/Preventive" step. I have not done it YET, but I really don't think its a broken wire. That said I have been wrong before.

NICK


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post #11 of 18 (permalink) Old 04-05-2019, 03:35 PM
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Pictures.

Door Latch/Lock Module has three connectors and electric motor.

Water gets in, of course you oil/spray door handle with Silicone every three to six months. RIGHT??

The third picture is contact for "detent" window.

As said, RDM should be called Roof Door (Window) Module.

Mike and I repair them all the time and sometimes it is broken wire in harness, why, every time you open the door, only to drive, it "bends" the small gauge wire that goes thru door until it breaks. How do I know, it happened to me.

The last picture is how it looks NEW!

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post #12 of 18 (permalink) Old 04-10-2019, 06:32 PM
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@ggoat!!! , updating my post #10, I finally did spray Silicon all around the door latch pawl and inside and around the out side Door handle levers . it DID seem to help. @Dicktator or someone posted pictures of WHERE to spray, from outside the door, to help prevent moisture getting into the module. I did not see it in the Library. Maybe it could be added?

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post #13 of 18 (permalink) Old 04-10-2019, 07:16 PM
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"pictures of WHERE to spray, from outside the door, to help prevent moisture getting into the module."

Agree Nick. Photos would be helpful information in placing the silicon spray nozzle/straw into the door correctly, to spray the mechanism. Anyone??
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post #14 of 18 (permalink) Old 04-10-2019, 10:13 PM Thread Starter
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I took mine apart tonight. I cleaned every single thing with an entire can of contact cleaner...even though I couldn't see any corrosion whatsoever.

Didn't make a damn bit of difference. The window ONLY goes down the absolute nanosecond that the door moves a quarter millimeter.

I'm done messing with it. For now.
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post #15 of 18 (permalink) Old 04-11-2019, 12:59 AM
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Originally Posted by VI Ken View Post
"pictures of WHERE to spray, from outside the door, to help prevent moisture getting into the module."

Agree Nick. Photos would be helpful information in placing the silicon spray nozzle/straw into the door correctly, to spray the mechanism. Anyone??
Here you go, Ken.
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post #16 of 18 (permalink) Old 04-11-2019, 08:23 AM
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Quote:
Originally Posted by xoxoxoBruce View Post
As usual, ask and you will receive!!! Thanks from me and Ken. Ah ha Missed between the glass and outer door skin.

Nick
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post #17 of 18 (permalink) Old 04-11-2019, 09:30 AM
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Thanx xoxoxoBruce. Off to find the spray can ...

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post #18 of 18 (permalink) Old 04-11-2019, 09:51 AM
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Have you tried reindexing the windows. Might help,might not,but only takes a few minutes to do.


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