Ikeep losing functions on my Cadillac STS 2005 only after winter storage. I lost interior entry lights, climate control and outside temperature gauge all at the same time. Now I also lost my clock.

40

Asked by littlepooh Dec 08, 2017 at 09:35 AM about the 2005 Cadillac STS V6 RWD

Question type: Maintenance & Repair

I keep losing functions on my Cadillac STS 2005 only after winter storage. I lost
interior entry lights, climate control and outside temperature gauge all at the
same time. Now I also lost my clock. If I disconnect my negative battery cable
they all come back on, but they go back off after car is run for a while. any
ideas??

12 Answers

254,455

Did it loose battery power while in storage? if so that may have caused a program glitch in the BCM, and if that is the case the only place too get the programming reflashed is the dealer.

40

Yes, the external battery was dead enough so that the car would not start, but the internal battery that cadillacs have still allowed security and horn and other functions to still work. I have since then put in a new battery and the functions came back on, but only briefly. As you run the car awhile, the 3 same functions again disappear, and now a new function, the clock has also disappeared. If you remove the negative cable from the new battery for several minutes, the functions again come back, but then disappear after the car warms up. Odd to me that they come and go. Also, while driving the car, the functions come on for a bit and then go off. Could it merely be a bad relay from charging the old battery with a battery charger before I replaced the battery with a new one?

2 people found this helpful.
254,455

I'm still suspect a programming glitch, once they happen they won't go away and could get progressively worse as time goes on.

1 people found this helpful.
40

Thx for your answers. Why would these features come on and off though???

254,455

That's odd Car Gurus kicked back my response for your last question. try it again. The BCM controls some relays for some of the systems you have mentioned but not all, others are direct grounding or power cycling. If you had the right scan tool you could see those systems and circuits working or not, that's why the dealer is the only place to have this checked out and fixed. Normally I'd say find a good independent shop and save some bucks but they don't have the specialized test equipment needed for this type of problem.

40

Thx for your answers. Why would these features come on and off though??? Should I at least start by switching out some of the relays in the fuse panel with a new one to see if it makes a difference? I know my Cad dealer will charge me $150 just to test this issue.

1 people found this helpful.
254,455

If your comfortable with trying that first, also look for any corrosion inside the connectors you may need a small light to look down inside. Is it damp in your climate, if so you may also want to check and clean the main and auxiliary ground connections, and the sensor grounds while your at it. I just remembered an issue I had with my Caddi, there was a dash ground on the passenger side that you could access by removing the glove box assembly, that was loose on ime and cause wierd stuff with the radio and the climate control, cleaned and tightened it up and the problem went away, I think I forgot about it cause it was too easy of a fix.

2 people found this helpful.
30

If you have navigation system in you STS the Not being able to set the clock is a known problem but nobody wants to step up and fix it. Look at the Cadillac forums for additional information.

3 people found this helpful.
10

Had mine in for ECM replacement. dealer did not disconnect battery but when I picked it up the clock was gone and I could not set it. Three days in the shop and several calls with GM technical support the dealer was told there is at this time no fix, except for replacing the entire radio/gps unit. My son did some research and found out that GM is aware of this "glitch" and it is related to an internal software problem. (Y2K hack?) Apparently the clock shuts down after so many hours of actual vehicle run time. My thought was if you replace the unit with a used or even new unit off of the shelf, it will eventually die if it has the bad programming built into it also. Until GM acknowledges the problem and steps up with a fix, I think we are all out of luck.

1 people found this helpful.

I am currently having the exact same problem with my 2005 STS V8. Littlepooh, any confirmed fix?

40

Electronic control module ECM Very expensive from dealer. I bought mine online.

1 people found this helpful.

The last thing that I heard for 2005 Cadillac STS is that the clock should come back around August 20th, 2020. I have no further information or explanations as to why this date will fix the clock. I bought a wristwatch for $25

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