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"Alarm System Service Required" and sunroof/moonroof stops working

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"Alarm System Service Required" and sunroof/moonroof stops working

  #1  
Old 08-30-2013, 08:28 AM
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Default "Alarm System Service Required" and sunroof/moonroof stops working

A few weeks ago, the error message "Alarm System Service Required" came up on my 2005 XC90 2.5T. At the same time, the sunroof (moonroof) stopped working.

Fortunately, there are a number of threads on this topic:
* https://volvoforums.com/forum/volvo-...ck-open-31433/
* 2001 S80 T6 Siren Module Replacement/Repair - Matthew's Volvo Site
* Alarm Service, Alarm Triggered, Sunroof Not Working - Howard's Volvo Maintenance

Thought I'd add my own experience. As others have found, the car alarm module is upstream of the sunroof motor circuit. When the NiMH battery in the siren unit fails, that "Service Required" message will flash and the sunroof motor will lose power.

The quick fix for this XC90 -- YMMV -- was to pull the fuse that controls the alarm system. In my case, that was the #26 10-A fuse located under the steering wheel (easy access, but requires a Torx screwdriver). See page 160 of the Owner's Manual and attached image.

If this works, the service message will go away, and the sunroof motor will be energized.

The permanent solution is to replace the failed siren unit. It is installed forward of the passenger (right-side) front wheel well, accessed by partly removing the plastic fender skirt.

The local dealer quoted me about $300 for the siren. Instead, I ordered part #9499758 from Volvo Parts Webstore, discounted to $232. I also ordered 8 rivets (P/N 979878, $1/ea) for re-attaching the fender skirt; ended up using five.

The procedure is a revision of the one posted at Matthew's Volvo Site, linked above. That's for a 2001 S80, but very similar to my '05 XC90.

Tools & Supplies

Torx T-25 screwdriver to access fuse box
Drill and +/- 3/16" bit
10 mm socket/wrench
5 to 8 Volvo rivets (above) or 3/16" X 1/4" pop rivets
Rivet gun
6 mm x 1.0 hex bolt, ~1 cm long. Replaces anti-tamper mounting bolt
And typical items from your toolbox

Procedure

De-energize the alarm system. Do this by disconnecting its fuse (described above) or by disconnecting the car's battery.

Jack up and block the passenger's side (right) front wheel. Remove the wheel.

Remove the two nuts (10 mm heads) and drill out the aluminum rivets holding the fender liner to the fender. It may not be necessary to remove the liner entirely; see attached image.

Look up into the front part of the wheel well to see the siren inside its mounting bracket (red arrows in attached images).

Remove the anti-tamper mounting bolt. I used a pair of small Vice Grips (see image).

With the siren removed, use a slotted screwdriver to depress the locking tab on the wire connector, then slide the connector out.

Replace the old siren with the new one.

Test the repair: Replace the #26 fuse or re-connect the car battery. Turn on the ignition. Clear the error messages (button at tip of stalk). Check to see that sunroof works. Roll down driver's window and lock car with remote, activating alarm system. Wait 5 minutes, till alarm is active (alarm-system red LED beneath windshield is flashing 1x/10 sec). Reach in window, unlock door, open door -- that should trigger the siren. De-activate alarm with key and again clear messages.

Replace fender skirt, using rivets.

Replace wheel.
 
Attached Thumbnails "Alarm System Service Required" and sunroof/moonroof stops working-driversfusebox2.jpg   "Alarm System Service Required" and sunroof/moonroof stops working-wheelwell2.jpg   "Alarm System Service Required" and sunroof/moonroof stops working-wheelwellcloseup2.jpg   "Alarm System Service Required" and sunroof/moonroof stops working-visegrip2.jpg  
  #2  
Old 08-30-2013, 08:33 AM
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Default Trackbacks

Adding trackbacks to previous VolvoForums posts on this topic ("Alarm System Service Required" and sunroof/moonroof stops working).
 
  #3  
Old 02-07-2014, 04:26 PM
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Does the computer need to be updated to recognize the new siren.
 
  #4  
Old 02-27-2014, 04:05 PM
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I bought a used 2006 XC90 V8 which displayed the error message "Alarm System Service Required" everytime its engine was turned on when the doors had been locked before entering the car(I reset the message everytime). The sunroof worked properly when I bought the car and did not show any problem until three years later, when it stopped working entirely, stuck in the closed position. I had not bothered to have the "Alarm System Service Required" message problem fixed before but the sunroof malfunction really bothered me. So, I tried removing the fuse as suggested by AMac and, in my car, it did NOT fix the sunroof problem. The dealer said that I need to replace the "sunroof control module" and, if I wanted to take care of the "Alarm System Service Required" message, I have to replace the anti-theft siren. They are talking about $500 in parts plus labor.
 
  #5  
Old 02-28-2014, 02:48 PM
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Originally Posted by mafb View Post
I bought a used 2006 XC90 V8 which displayed the error message "Alarm System Service Required" everytime its engine was turned on when the doors had been locked before entering the car(I reset the message everytime). The sunroof worked properly when I bought the car and did not show any problem until three years later, when it stopped working entirely, stuck in the closed position. I had not bothered to have the "Alarm System Service Required" message problem fixed before but the sunroof malfunction really bothered me. So, I tried removing the fuse as suggested by AMac and, in my car, it did NOT fix the sunroof problem. The dealer said that I need to replace the "sunroof control module" and, if I wanted to take care of the "Alarm System Service Required" message, I have to replace the anti-theft siren. They are talking about $500 in parts plus labor.
I would say it's the alarm module inside the RF wheel well behind the right front headlight. Fairly easy to DIY.
 
  #6  
Old 03-21-2014, 02:15 PM
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Follow on the posts about the "Alarm System Service Required" and the sunroof malfunction: first I had the sunroof control module replaced by the dealer and it did not work initially. The dealer mechanic had to isolate the alarm siren wiring which was interfering with the sunroof control module. After that it was necessary to download a piece of software into the XC90īs computer. This fixed the sunroof problem, but not the "Alarm System Service Required" message. Next I had the anti-theft siren replaced by the dealer, (the siren is located where CedarBear explained above). However, I would not venture to DIY because it was necessary again to download another piece of software into the XC90īs computer. Finally got rid of the message and the anti-theft siren is fully operational! I wouldnīt advise to DIY unless you have the hardware to download the software necessary to make these parts interact with each other. It looks like it was designed so that the dealers can make more money!
 
  #7  
Old 03-22-2014, 08:58 AM
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Originally Posted by mafb View Post
Follow on the posts about the "Alarm System Service Required" and the sunroof malfunction: first I had the sunroof control module replaced by the dealer and it did not work initially. The dealer mechanic had to isolate the alarm siren wiring which was interfering with the sunroof control module. After that it was necessary to download a piece of software into the XC90īs computer. This fixed the sunroof problem, but not the "Alarm System Service Required" message. Next I had the anti-theft siren replaced by the dealer, (the siren is located where CedarBear explained above). However, I would not venture to DIY because it was necessary again to download another piece of software into the XC90īs computer. Finally got rid of the message and the anti-theft siren is fully operational! I wouldnīt advise to DIY unless you have the hardware to download the software necessary to make these parts interact with each other. It looks like it was designed so that the dealers can make more money!


Correct. With DIY, sunroof will work again, but dealer software is required to get rid of 'Alarm System Service Required' message.
 
  #8  
Old 10-22-2014, 07:17 AM
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Arrow 2001 S80 alarm siren module

I replace the alarm siren module on my S 80 and now I am unable to start the car. I have tried to reset the computer by locking and unlocking the car 3 times and also disconnecting the car battery and nothing works. I hope I do not have to tow the car to a Volvo dealer and have them reset my computer.
thanks
 
  #9  
Old 08-13-2016, 04:50 PM
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Location: NY
Posts: 42
Default Sunroof Failure

Interesting thread, but in my case, yes, the alarm siren doesn't work, but no service warning ever came on? Removed and checked #26 fuse and still no sunroof, so is there other places to look for problem? So has anyone replaced module or switch, but both operations do not work. Usually is switch goes bad, one or the other operation would fail, so any suggestions.

Thanks,
 

Last edited by FREE-PPV; 08-16-2016 at 09:29 AM.
  #10  
Old 11-07-2017, 06:04 PM
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Hello Volvo Forum, I am new to forums and hope that I am posting my message in the right place and will get a helpful response.
I have a 2005 Volvo XC90 that has a "Alarm system needs servicing" message.
I have replaced the Alarm module under the passenger side fender with a factory new module, but the message still comes on. The dealer said that replacing the module should have solved the problem and nothing needs resetting, but it could be something else. The sun roof works and all fuses check good. What else can I check to solve this problem?
 
  #11  
Old 11-08-2017, 07:46 PM
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Join Date: Aug 2016
Location: NY
Posts: 42
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Did you happen to verify if alarm system worked prior to replacing module? I have found that wet CEM module can cause many false warnings, one being alarm needs servicing. Does the alarm work, did you try it? May sound silly, but many have wasted money replacing things Volvo computer message says is wrong, a real money maker for Volvo. lol
 
  #12  
Old 04-04-2019, 11:56 PM
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Join Date: Apr 2019
Posts: 1
Default Moonroof issue solved

I have a 2005 xc90 T6 that I recently purchased used a little over a month ago. The moonroof wasn't working but appeared to be closed all the way. I could hear air blowing through it while driving. I just assumed it was a bad seal and\or maybe the fuse or motor went out. I also had the "alarm system service required" notification on the dash. I didn't think much of it since I've had several cars before the a "check engine" light on and had no issues with. I up until yesterday hadn't bothered much to look into either issue considering my car wasn't having any issues running or driving. Well, my car was filthy from road grime and mud from winter so I decided to take it through the carwash. I was sitting there as it started just enjoying it when all of a sudden my moonroof started gushing water and I'm soaked. Thank goodness it wasn't one where you are locked into a track. Not knowing what to do and how to stop it I put it into gear and fled out of the carwash. I was in a panic. Turns out the wind I was hearing was the moonroof open just a tiny bit. So I went and bought a set of fuses thinking that replacing the moonroof one was the problem. Sadly, that didn't fix it. So I did some research and stumbled across forum after forum linking the moonroof failure to the faulty alarm system. Looking for ways to fix it I initially found 2 options first was to replace the alarm module which would have been a nightmare to get to. Option 2 was to take it to a dealer to have the alarm system permanently shut down. I don't live anywhere close to a Volvo dealership so that wasn't an option. I looked at one more thread and saw I could remove the fuse for the alarm system and it might possibly fix it. So when I pulled the fuse I noticed it had blown. I put a fresh fuse in there and magically my moonroof worked and my warning message was gone!!! I was dreading having to replace the motor but that wasn't needed. I'm so happy it was a quick and easy fix. I love my XC90 and would hate to shell out hundreds of dollars to possibly get it fixed. On a side note I discovered that that car has 4 fuse panels!! My husband told me he was proud of me for looking into the issue and resolving it myself. He had planned to look into it This weekend.
 
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