[wizzr]

Can you say, "hen's teeth"?

 

[soren703]

It might be helpful if you explain the need for the RDM? Who diagnosed the need for the RDM or problems you are having? Did you check with the salvage guys?

 

[2004-YELA]

I am still trying to determine the actual cause for the failure. All seems to point to RDM.
Recap:
Windows, top, A/C, trunk lid release DO NOT Work.
Door Locks, T/C DO WORK from center console.
This what I have done.
All Fuses and Relays test good, in both fuse boxes.
disconnected battery cable at engine fuse box and left it off for 2 days, and then reconnected, no change in issues.
Purchased TECH2 scanner, scanned vehicle and no codes were stored in the system.
Tried to operate windows up/down from scanner, no movement took place.
Next step planned is to access the RDM and check connection.

Any and all help from you all who know this car inside and out would be greatly apricated.
Thank You Soooooooooooooo much.

 

[Autoprof]

With your tech 2, you will find access to RDM data by going first to Body Control module (select body from pic 1) then scroll down the menu that pops up to find RDM (sorry no pics stored for this). Select that and check for codes in RDM first.

The tech 2 will not scan all modules and give you the codes in each module.
But before you start looking for codes in each module. You can check all modules to see if they have any codes using the tech 2
From screen in pic 1. Select diagnostic circuit check.
From that screen in pic 2 select DTC check.

It will then tell which modules have a code, but you will have to go to each module to access and read the code. Pics 3 and 4. You have to scroll down to see all modules. There a couple of modules that have codes stored in this truck. I would then go to back and select Body, then select SIR. To check for supplemental inflatable restraint module codes. The same for the list of modules shown on the line above it. From select body, select BCM.

NOTE: I believe these were from a school truck I took pictures of screen shots for a presentation not from my SSR. Either way, the selections will look similar.

Additionally, Diagnostic Circuit Check -- then Class 2 Power Check. Provides the ability to see if modules on class to network are seeing correct ignition switch signal.

 

[2004-YELA]

thank you I will reply with my tech2 pics

 

[Stlhotrod]

Having pulled several RDMs, I would bet the connections are not a problem unless some one had worked on it. There are 4 harness that plug into it and each one has clips that hold them in. Even trying to get them out you have to wiggle them a little to get them out.

I know you said you had the positive battery cable disconnected but did you try the hard reset? Removing both battery cables from the battery and holding them together to reboot the computers? I am not sure if it will help or not but when I was talking with Mike some time ago he had it solve one trucks problem. So it might be worth checking out.

 

[2004-YELA]

No I did not hold them together, I will try that this week end and let you know

 

[nj6969]

@2004-YELA, In your post #4 you said you "disconnected the battery cable at engine fuse box". Just to be clear. the "hard reset" @Stlhotrod mentioned above, is done AT the battery. Disconnect both cables, positive and negative, from the battery, and hold them together with a clamp, or vise grips. I'm not sure about how long, but 15 minutes should be long enough. Hope it helps.

Nick

 

[2004-YELA]

thanks, well do

 

[snomuncher]

The Tech 2 Class 2 Diagnostics menus lead to multiple screens indicating status of the RDM. I connected a Tech 2 to my SSR with a working RDM and was able to see status of the RDM itself (“Active”) as well as other RDM data inputs and outputs. There are too many screens to reproduce here but I would recommend that you follow the suggestion made by @Autoprof and see what RDM information displays on the screens of your Tech 2 under the System Diagnostics menus to further determine its status. I would assume that a non-functional RDM would not report all of the data that is available. I’ve included below a few screenshots from my Tech 2 FYI.

 

[2004-YELA]

I will post my test results this week end
thanks

 

[2004-YELA]

ok here are my test results
please note that during these test reading I did try to operate roof and windows and the test results do not change.
also when the tech2 ask if I wanted to up or down the driver window, I tried both and neither worked.
I do not know what the * means at line items. I am guessing it means no results.

Please let know what you think.

 

[snomuncher]

Thanks for the follow-up. The two DTCs listed are related to the braking system and traction control so are not part of an RDM issue. How do your Tech 2 readings for the Roof and Door Module F1- Data Display menus compare with those I posted? Are those the results you are seeing that display with an asterisk (I don't see any in your photos)? And what does your tool report for the roof system status? Those results are likely stored in and reported by a functional RDM.

 

[Autoprof]

Agree totally with @snomuncher
Codes shown will not cause an issue with RDM operation
When looking at data from RDM pay particular attention to
"Ignition Battery Voltage" -- The description is not very accurate. This is actually the 12 volt reference used for the power window motors and roof sensors. It normally will set a low voltage code in the history of RDM. BUT I have now diagnosed one myself that the code did not always return although problem was still there and helped with other member that had similar issue. Both did turn out to be a faulty RDM. But the same thing could be caused by a shorted sensor or sensor wiring. If that voltage is too low it will cause the DRM to shut down but still communicate. If this is case the test for it is fairly easy and I will send the steps to you.
Picture one shows the tech 2on a functioning RDM, the voltmeter is connector to the wire to the 12v sensor reference voltage wire -- NOTE near battery voltage.
Picture two shows the same on a non-functioning RDM.

Your DTC check screen shows there is a trouble code in the RDM - Double check that the screen you displayed and the codes are in the RDM. They seem like they may be in the ABS module, which also showed it had codes present.

Is your TECH 2 a genuine GM tech 2 or a knock off ?

 

[2004-YELA]

After taking your-all's advise, I found the following codes; U 1088, B1077, and U1128. All of these were in the history storage. The U1128 is due to having an after market radio. This radio was in the car when I purchased it and the roof and all had been working fine for about 2 years. As I am sure you can see, I have no experience with using the tech2. I ordered the Tech2 from amazon, it came from China. Attached are the screens taken today trying to follow your kind advise and guidance. They are shown in order taken. I will send the pics in a second post

 

[2004-YELA]

second page of pics

 

[2004-YELA]

page 3 of pics

 

[2004-YELA]

page 4 and last page
Please let me know what you think
I did not understand where to connect the voltmeter

 

[snomuncher]

Conversation sent- a few initial comments and questions..