Group:
My ’01 S60 2.4T has had the alarm system gone nuts for a year now.
It has only the basic alarm system and no trip computer.

Symptoms:
After locking it, the parking/turn signal lights flash repeatedly starting anywhere from 5 minutes to several hours later. The message says alarm system triggered.

The flashing lights condition is accompanied by a very, very weak sound from the siren. The panic button still works and blows the vehicle horn, or at least I think it is the vehicle horn.

Lately it all starts immediately after locking the car.

The LED seems to work OK.

The parking lights flash once as they should upon locking.
However, today I opened the hood and dropped it the last six inches as suggested by an old post. Now the lights do NOT flash upon locking! They did before I opened the hood.

A few hours later they recovered.

The remotes have always seemed to work OK, no erratic operation.
They both work the same.

The remotes are stored at night on a hook in the kitchen so no motion is going on. I have looked out and seen the lights flashing several hours after the car was locked. I can come out of a grocery store and find the message on the screen, after the light flashing is all done.

I did a search and found several suggestions, including the hood slam and erratic remotes.
None of the other posts seemed useful.

I have disconnected the battery several times for 20 minutes due to a gas cap CE light. So resetting the ECU has not helped. There are no codes stored.

The car has only 50K on it and is out of warranty so don’t want to get involved with a dealer. I would like to just disable the siren (which is weak) at least. But I cannot find it. Where is it?

Better is to disable the alarm system entirely. I find no fuse that says anything about the alarm system. Is there a relay that I can pull to disable the alarm system?

Anyone got any suggestions for what else to try, or where the siren/alarm horn is located?

Thanks in advance,

-- S’ V’

The alarm horn for the 850/70 is on the firewall at the center of the engine bay.

There is a lock sensor on the driver's side hood latch. Make sure the wires are not disconnected and the hood latches properly. I always grab the hood and try to pull up on both sides after closing the hood, burned too many times with a partially closed hood.

Also check to make sure the trunk is completely closed.

You could check the remotes for dirt in the switch area by taking them apart. The two sides are just pressure fitted together.

Klaus

--
I still miss my 164 and my 854T. Just driving a V70R :)

Klaus:
Thanks for the response.
The S60 is not like an 850.
Siren cannot be located.
Hood closes flush and cannot be tugged on when closed.
Your V70 should be similar w/r to the siren and hood.

-- S' V', wondering what the system will do next

S60 siren is located under the r.f. wheel fender liner, foreward of the wheel opening. You will have to drill out the blind rivets to access. The hood sensor is oon the drivers side hood lock. An open or short or intermittent contact in any of the doors or hood/trunk can cause the symptoms you describe.

Thanks, Bob.
Is there a relay I can pull, or another way to disable the wiring to the siren?

Wonder why they hid the thing so well.

S' V'