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2005-2010 Mustang GT Tech Forum

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Unread 03-30-2011   #1 (permalink)
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Default 2005 Mustang GT Alarm goes off randomly

Hello,

I have an 2005 Mustang GT with active anti theft system.

In February i washed my car and a few days later, i recognized that i have water on the driverside and on the other side.
This problem i solved by replacing the seal at the doors. no everything is dry.

But since this time my alarm goes off randomly. mostly without setting up an message on the instruments ( only one time there was "Security event approched" ).

I checked the SJB , but there is no problem with it, it is dry and has never seen water.

Now i want to deactivate the alarm totaly, but i dont know how.
I talked to heat performance but they can only deactivate the PATS with a tune, not the AATS.

Has anyone an idea, how to deactivate the alarm completly?

I live in germany and the ford dealers just tell me, they could not deactivate it.

Nice greetz from germany.
Benjamin
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Unread 03-30-2011   #2 (permalink)
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Are the windows open when this happens?
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Unread 03-30-2011   #3 (permalink)
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No, they are closed.

I think there are two possible reasons for the problem.
a) one sensor is damaged ( door, trunk, hood ) but than it should display a message on the dash
b) the alarm box is damaged . this is what i think because no message on the dash, so it seems to be an reasonless panic-alarm..
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Unread 03-30-2011   #4 (permalink)
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Possible. I'd maybe take a shot at giving the motion sensors a gentle wipe down. Not sure if anything's on them at all, but it'd only take a minute to do so why not.
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Unread 03-30-2011   #5 (permalink)
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The motion-sensors works .

i locked the doors this midday by pushing the close buttons on the door and than closed the doors.. after 30 minutes my mustang cried again..
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Unread 03-30-2011   #6 (permalink)
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Do you have a coupe or a convertible?

The perimeter security system functionality is contained in the SJB. It is possible that got wet in the past and you were not aware of that happening. There could possibly be corrosion forming on the contacts of the SJB wire connectors. There are connectors on both the front an rear of the SJB. That is one place to start looking.

Is the perimeter security system arming correctly? Do the turn signal lamps flash once when you arm the system? How many times does the horn beep when you arm it?

The system can be armed with the interior motion detectors and tilt sensor disabled by locking the drivers door with the key, instead of using the remote keyless entry fob. This will tell you if the problem is related to the motion / tilt sensors. If the alarm does not falsely trigger when arming the system in this manner, but does when armed with the fob, your problem is most likely with those sensors.

Also, it is possible that corrosion may have developed in the door switches / door switch connectors. Are the interior lights off with all the doors closed? Do they come on when each door is opened?

The SJB has it's own set of DTCs. These DTC will not necessary cause the check engine light to illuminate. They are retrievable using the dealer scan tool (WDS/PDS/IDS). Did your dealer check for codes in the SJB? Here are some possible related codes:

Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index

DTC Description Source Action
B1519 Hood Switch Circuit Failure SJB GO to Pinpoint Test E .
B1833 Drivers Unlock Disarm Switch Circuit Short to Ground SJB GO to Pinpoint Test A .
B200A VSM Inclination Failure SJB GO to Pinpoint Test G .
B200B VSM Ultrasonic Failure SJB GO to Pinpoint Test G .
B200C VSM Module Failure SJB GO to Pinpoint Test G .
B2569 Liftgate Disarm Switch Circuit Short to Ground SJB GO to Pinpoint Test F .
U2033 VSM Communication Link Failure SJB GO to Pinpoint Test G .
All Other DTCs SJB REFER to Section 419-10 .


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Unread 03-30-2011   #7 (permalink)
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Usually when false alarms are triggered and no codes are received with IDS, I can check the previous eight alarm events in the datalogging section. This narrows down the search greatly. If you dont want to take it to the dealer and are sure SJB is OK, the hood switch is often the culprit...
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Unread 03-30-2011   #8 (permalink)
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Quote:
Originally Posted by Stevie D View Post
Usually when false alarms are triggered and no codes are received with IDS, I can check the previous eight alarm events in the datalogging section. This narrows down the search greatly. If you dont want to take it to the dealer and are sure SJB is OK, the hood switch is often the culprit...
That's a great point. Are you referring to the following PIDs?

AL_EVT1
AL_EVT2
AL_EVT3
AL_EVT4

I only see 4, not 8?

Which one is the most recent, AL_EVT1?

There is also:

D_DR_SW (Closed / Ajar)
HOOD_SW (Closed / Ajar)

No P_DR_SW and TRUNK_SW though?
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Unread 03-30-2011   #9 (permalink)
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Also, if the hood switch is bad, will the system not arm and sound two beeps of the horn instead of just one?
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Unread 03-31-2011   #10 (permalink)
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Hello thanks for the answers,

i got an coupe.
All the alarm-system is in the sjb ?
I had checked the sjb completly with an car-electrician. It has never seen water.
Although the plug contacts seems to be okay. We checked them and there are no corission on them.

I thing the alarm system is arming correctly. The only think that makes me thinking is, when i push the close button two times, it chiprs two times, so i think there could be something wrong with the door-switches.
How could i check them? Will there be a DTC which i can read out with an normal diagnostic-system or an SCT X3?

Will all the mentioned DTCs be readable with the SCT X3?

The alarm goes off after some time on each possible way of closing. So i think it could be a damaged door switch.

I am in germany, so no dealer here, wants to check an american car! they are affraid to to something wrong. the weekend after this an ford dealer, 90 miles a way , would look after my mustang, but so long i have to deactivate the alarm, so that i can park it near my house.

Today i will check if i can get some DTCs with the big diagnostic system we have at work, but it is not a special ford diagnostic.

Thanks so far, for your hints.
But nobody knows how to deactivate it shortly or?
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Unread 03-31-2011   #11 (permalink)
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In Addition:

5 Minutes ago i checked with my SCT X3 if i can read out any DTC, but there seems to be no DTC or the X3 can't read out, the DTC can only read out the DTCs from the motor-ecu and not from the SJB.

That i dont know.
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Unread 03-31-2011   #12 (permalink)
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The perimeter security functionality is in the SJB.

Did you remove the SJB and check the connectors on the back side of the box? The only way to access them is by removing the SJB. You just need to remove the single nut at the bottom of the SJB.

Your alarm system is not arming correctly if the horn is sounding two chirps. It should only sound one chirp and the turn signals should flash once if it is arming correctly. It sounds like you have a problem with one of the switches or wiring somewhere.

I'd suggest you start with the hood switch as Stevie D suggested. This switch provides continuity to ground when the hood is closed and the switch is depressed. The black wire on the switch should have continuity to ground and the violet with orange stripe wire connects to the SJB. You can check for continuity across the switch terminals when it is depressed and check for continuity to ground on the black wire with a meter. You should also make sure the switch is actually getting depressed when the hood is closed and the switch bracket is not bent down.

You can try shorting the violet with orange stripe wire to ground to see if that stops the problem. You can unfold an uncoated metal paper clip and insert it into the connector pin to test the ground and short the violet with orange stripe wire.

There is also a switch in the truck with is different from the trunk light switch. I believe this is a tilt switch located behind the latch panel.

You will not be able to read SJB DTC codes with the SCT X3. The Ford WDS/IDS/PDS scan tools can definitely read them. I believe the OTC Genisys with the correct options may also be able to read them. Not sure about the Snap On scan tool.

You could try disconnecting the battery when you park the car if the alarm sounding is bothering you or your neighbors until the problem is fixed.

-Stangstta

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Unread 03-31-2011   #13 (permalink)
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Thats really not so good, that the perimeter security is in the sjb, so i can not disconnect it.

Is there away to deactivate is via ODB?

Yes i know, that there is something wrong, when it chirps two times, but without an ford-diagnostic system i can not approve what is wrong.

Next saturday i will go to an ford-dealer who thing he could read out the SJB DTC, but if you are right and it is an damaged switch at the door or hood ( i think it will be a door switch or perhaps both, because of the water ) it will take a long time to get the switch from the usa to germany. So i have to find a way, to get the ***** alarm-system deactivated!
Do you have any idea?

But i will also try to check the hood switch next monday or perhaps tomorrow when it will not rain again.
I hope i get this managed.

I have an trunk light? i have never noticed this. I will look for the switch in the trunk and also will try to test it.

I think most of the ford dealer in europe have to have an ford diagnostic to check the sjb dtc. Perhaps i will get the dealer next to me, to try if he could get any DTC.

So you are sure that the normal OEM alarm system has no reset/programming button? I read about this mysterious button in several threads, but no one could say where it was located exactly.

Nice greets and thanks again from germany
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Unread 03-31-2011   #14 (permalink)
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Quote:
Originally Posted by Student4Gold View Post
Is there away to deactivate is via ODB?

Not that I am aware of. Did you ever try locking the vehicle just using the driver's door key lock as I previously suggested?


Quote:
Originally Posted by Student4Gold View Post
Yes i know, that there is something wrong, when it chirps two times, but without an ford-diagnostic system i can not approve what is wrong.

This is not true. I told you a fairly easy way to diagnose the hood switch. You could easily bypass it by unplugging the connector and inserting a paper clip to short the connector terminals together if the switch is defective.


Quote:
Originally Posted by Student4Gold View Post
Next saturday i will go to an ford-dealer who thing he could read out the SJB DTC, but if you are right and it is an damaged switch at the door or hood ( i think it will be a door switch or perhaps both, because of the water ) it will take a long time to get the switch from the usa to germany. So i have to find a way, to get the ***** alarm-system deactivated!
Do you have any idea?.

As I stated, you could try locking the car with the driver's door keylock and key and do not use the key fob. You could also disconnect the battery.


Quote:
Originally Posted by Student4Gold View Post
I have an trunk light? i have never noticed this. I will look for the switch in the trunk and also will try to test it.
Yes, if you never noticed it, then the bulb may be blown out. This is common from slamming the trunk closed. As I stated previously, the switch that controls the trunk light is not the same switch for the security system.


Quote:
Originally Posted by Student4Gold View Post
I think most of the ford dealer in europe have to have an ford diagnostic to check the sjb dtc. Perhaps i will get the dealer next to me, to try if he could get any DTC.

If they have the Ford IDS, or even the WDS scan tools, they can access the codes and diagnose the system.


Quote:
Originally Posted by Student4Gold View Post
So you are sure that the normal OEM alarm system has no reset/programming button? I read about this mysterious button in several threads, but no one could say where it was located exactly.

I have read similar threads about this secret switch, but I am not aware of any. There is no mention of such a switch in the Ford Factory Service Manual or on the Ford Factory wiring diagrams either. The only mention of an Inhibit Switch is the one on the driver's door key lock.

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Unread 03-31-2011   #15 (permalink)
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Yep, just don't lock it using the key fob or the door switch and the alarm's not on.
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