Help with the alarm system on a 855 t5 from 1995

Oblivious · Jun 20th, 2019, 17:31

Hello, a couple months back I bought an 850 from 1995, which came with a switch to turn off the alarm.
Today I went to turn it on, and it immediately went off, beeping and flashing the hazard lights.

What can cause this?
How can I fix it?

The alarm is a 3542744, it even has Volvo written on it.

Shinsplintz 101 · Jun 20th, 2019, 20:33

Pull the relay from under the steering wheel (drop the trim & it’s tucked up under ) get a known good working spare ( matching numbers) & try that.

There are a fair few problems that could cause the alarm to go faulty- but the relay is a good place to start.

Good luck!

Morgan

scutyde · Jul 3rd, 2019, 14:06

That is the control box for the ultrasound sensors which should be located up on the A pillar near the roof. Look like microphones.

You could unplug them from the relay (210 211) . The plug is on top of the relay a green one. That way the alarm still works but only monitors the doors, hood, trunk/tailgate and if someone tryies to jump start the car.

Keep in mind that this Guard Alarm system can only be activated or deactivated by the remote and not by key. Means if you locked the car by remote and open it by key the alarm will go off and deactivate the starter motor.

Jun 20th, 2019, 17:31	#1
Oblivious New Member Last Online: Jan 14th, 2020 23:08 Join Date: Jun 2019 Location: Oeiras	Help with the alarm system on a 855 t5 from 1995 Hello, a couple months back I bought an 850 from 1995, which came with a switch to turn off the alarm. Today I went to turn it on, and it immediately went off, beeping and flashing the hazard lights. What can cause this? How can I fix it? The alarm is a 3542744, it even has Volvo written on it.

Jul 3rd, 2019, 14:06	#3
scutyde Retrofit master Last Online: Mar 28th, 2022 10:14 Join Date: Mar 2010 Location: Berlin	That is the control box for the ultrasound sensors which should be located up on the A pillar near the roof. Look like microphones. You could unplug them from the relay (210 211) . The plug is on top of the relay a green one. That way the alarm still works but only monitors the doors, hood, trunk/tailgate and if someone tryies to jump start the car. Keep in mind that this Guard Alarm system can only be activated or deactivated by the remote and not by key. Means if you locked the car by remote and open it by key the alarm will go off and deactivate the starter motor. __________________ Volvo 850 2.5 20V MY95 Pictures Here what I retroffited so far List

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Jun 20th, 2019, 20:33	#2
Shinsplintz 101 Senior Member Last Online: Apr 12th, 2024 22:08 Join Date: Jan 2011 Location: Baldock View Photos By: Shinsplintz 101	Pull the relay from under the steering wheel (drop the trim & it’s tucked up under ) get a known good working spare ( matching numbers) & try that. There are a fair few problems that could cause the alarm to go faulty- but the relay is a good place to start. Good luck! Morgan

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