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Old 04-01-2015, 06:42 PM   #1
bjak
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Default 04 Doors randomly locking/unlocking, alarm going off while driving, horn beeping...

So for the last few weeks the locks on my 04 Saturn Ion have been going BERZERK while I drive. It's like every time I get in the car, the locks decide to start locking and unlocking at rapid fire. Accelerating and decelerating seem to make it worse.

After particularly bad spells of the locks going crazy, I hear a slight ticking noise (similar to the sound of the turning signal) from near the steering column, followed by the car alarm going off (often while I'm driving). The alarm will stop after it completes its "cycle", but then will start up again when I start the car. The only way to get it to stop is to keep driving with the alarm going.

I've checked the door jamb switches and they are all in working order. I replaced the driver side front switch to be safe.

Some possibly pertinent info:
- There is a non-functional after market automatic starter installed
- Ignition switch was recently replaced after GM recall
- Roads in my area are salted in the winter
- No leaks that I can see
- Battery and alternator are both new (~2 years)

Help would be appreciated! My mechanic can't seem to offer me any explanation.

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Old 04-01-2015, 10:14 PM   #2
2006 ion2
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2007 ION-2 Sedan
Default Re: 04 Doors randomly locking/unlocking, alarm going off while driving, horn beeping.

This is almost always plugged sunroof drains causing water to run down the a pillar into the door switch or wiring.

...
2007 Saturn Ion 2
2003 Chevrolet venture lt

trifecta dealer for the U.P. and WI. There is no two door ion. Proudly driving one of the last saturns produced before gm killed the brand.

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Old 04-02-2015, 04:12 PM   #3
bjak
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Default Re: 04 Doors randomly locking/unlocking, alarm going off while driving, horn beeping.

No sunroof, so that can't be it.

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Old 04-02-2015, 05:20 PM   #4
2006 ion2
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Default Re: 04 Doors randomly locking/unlocking, alarm going off while driving, horn beeping.

Then a bad connection or corroded door switch?

...
2007 Saturn Ion 2
2003 Chevrolet venture lt

trifecta dealer for the U.P. and WI. There is no two door ion. Proudly driving one of the last saturns produced before gm killed the brand.

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Old 04-03-2015, 12:54 AM   #5
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Default Re: 04 Doors randomly locking/unlocking, alarm going off while driving, horn beeping.

1-To be absolutely sure the aftermarket remote start system isn't interfering with your problems, either disable it completely by removing its fuse (most likely an inline fuse to the remote start module), find whoever installed it to uninstall it or disable it completely or remove the entire system yourself. No one can guarantee any aftermarket remote start won't interfere or cause problems.

2-This may be bcm related since door locks are operated by bcm, factory alarm and Passlock theft deterrent are operated by bcm as well as many other functions the engine computer doesn't control. One way to isolate the random door locks cycling; either disconnect each door lock switch or remove the BCM PWR 15A fuse - this supplies power to the door lock system. See if door locks cycle with either switches or fuse removed. This doesn't rule put the bcm causing problems but can help point which way to proceed with more troubleshooting.

3-The factory alarm is bcm operated and one way to deactivate it is to use the remote to UNLOCK doors and not use the remote temporarily. Remote keyless entry is bcm operated. By not using the remote and using the key to lock and unlock doors, you're isolating this problem by eliminating use of the bcm for nothing important and attempting to see if the bcm is acting erratically on its own to; randomly cycle the alarm and cycle the door locks.

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