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  #1  
Old 03-24-2011, 11:06 PM
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Very Odd Alarm System Problem

Hi Everyone,

Have a '02 WJ Overland with the EVS security system (dealer-installed). Today, when I was out and about, I happened to unlock the vehicle as normal with my remote keyless entry transmitter. To my shock and surprise, the alarm went off when I hit the unlock button on the transmitter. The only way to shut off the alarm at that point was to press the override button that was neatly tucked away in the vehicle.

What could have caused this to happen? What do I need to check? I've had the alarm system in my Jeep for 2 years and never had an issue.

Thanks in advance for the help!
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- 2007 Dodge Grand Caravan SXT
- 1972 Dodge Challenger
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  #2  
Old 03-25-2011, 12:41 PM
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Re: Very Odd Alarm System Problem

It is normal for the alarm system to sound 3 times when unlocking after the alarm was triggered and timed out. Did it continue to sound?
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Old 03-27-2011, 11:29 PM
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Re: Very Odd Alarm System Problem

Yes, it goes off like someone was actually trying to break into it, and this is after I hit the unlock button on my key fob like normal so I can get in to it...didn't hit the panic button or anything like that by accident. I have to press the override button once I get inside to shut it off. Very embarrassing out in the parking lot, especially when I have to reach down low for the override, like I'm trying to hot-wire it or something.

And no, it wasn't triggered previously. I locked it, let it arm like normal, reach for my key fob, press the unlock button, and the alarm goes off as it unlocks.

In a nutshell, the system works perfectly fine except when I try to unlock it...my key fob, wife's key fob, new batteries in each, it makes no difference...alarm goes off.

Quote:
Originally Posted by Frango100 View Post
It is normal for the alarm system to sound 3 times when unlocking after the alarm was triggered and timed out. Did it continue to sound?
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Old 03-28-2011, 06:57 AM
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Re: Very Odd Alarm System Problem

So it will continue to sound until you press the override button, or will it stop by itself after some time?
What will happen if you unlock the door using your key instead of the key fob?
If the result with the key is the same, then there is a change that the door cylinder lock switch is faulty. This one should arm/disarm the system. This switch is mounted on the back side of the key lock cylinder. Here follows a test of this switch:

DIAGNOSIS AND TESTING - DOOR CYLINDER
LOCK SWITCH
Refer to the appropriate wiring information. The
wiring information includes wiring diagrams, proper
wire and connector repair procedures, further details
on wire harness routing and retention, as well as
pin-out and location views for the various wire harness
connectors, splices and grounds.
(1) Disconnect the door cylinder lock switch pigtail
wire connector from the door wire harness connector.
(2) Using a ohmmeter, check the switch resistance
checks between the two terminals in the door cylinder
lock switch pigtail wire connector. Actuate the
switch by rotating the key in the door lock cylinder
to test for the proper resistance values in each of the
two switch positions, as shown in the Door Cylinder
Lock Switch Test table.
DOOR CYLINDER LOCK SWITCH TEST
Switch Position Resistance
Lock (Clockwise) 473 Ohms (10%)
Unlock (Counterclockwise) 1.994 Kilohms (10%)
(3) If a door cylinder lock switch fails either of the

resistance tests, replace the faulty switch.
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  #5  
Old 03-28-2011, 07:38 PM
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Re: Very Odd Alarm System Problem

Thanks for the information. I'll take a look at the lock cylinder system.

I haven't let the alarm go off long enough to see what happens after a while.

The same thing happens when I use the key instead of my key fob.

I'll let you know what i find out later this week.

Quote:
Originally Posted by Frango100 View Post
So it will continue to sound until you press the override button, or will it stop by itself after some time?
What will happen if you unlock the door using your key instead of the key fob?
If the result with the key is the same, then there is a change that the door cylinder lock switch is faulty. This one should arm/disarm the system. This switch is mounted on the back side of the key lock cylinder. Here follows a test of this switch:

DIAGNOSIS AND TESTING - DOOR CYLINDER
LOCK SWITCH
Refer to the appropriate wiring information. The
wiring information includes wiring diagrams, proper
wire and connector repair procedures, further details
on wire harness routing and retention, as well as
pin-out and location views for the various wire harness
connectors, splices and grounds.
(1) Disconnect the door cylinder lock switch pigtail
wire connector from the door wire harness connector.
(2) Using a ohmmeter, check the switch resistance
checks between the two terminals in the door cylinder
lock switch pigtail wire connector. Actuate the
switch by rotating the key in the door lock cylinder
to test for the proper resistance values in each of the
two switch positions, as shown in the Door Cylinder
Lock Switch Test table.
DOOR CYLINDER LOCK SWITCH TEST
Switch Position Resistance
Lock (Clockwise) 473 Ohms (10%)
Unlock (Counterclockwise) 1.994 Kilohms (10%)
(3) If a door cylinder lock switch fails either of the

resistance tests, replace the faulty switch.
__________________
Rojohn Soriano
- 2002 Jeep Grand Cherokee Overland
- 2007 Dodge Grand Caravan SXT
- 1972 Dodge Challenger
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  #6  
Old 04-12-2011, 01:08 PM
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Re: Very Odd Alarm System Problem

Hi Rojohn, did you solve your problem?
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