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Braingears
Expert
Date registered: Apr 2006
Location: St Petersburg, FL
Vehicle(s): G320 & ML320
Posts: 1450
| Disable Alarm
My alarm goes off for no reason at all. The StarDiag does not see it, this I cannot find the faulty switch. The horn does not have a battery attacked, and thus is not the issue. Is there a way to disable the alarm system while allowing this key button lock to still work? |
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ychung
Veteran
Date registered: Aug 2015
Location: SO CAL
Vehicle(s): 2004 G500, 2014 ML350, 2008 S550
Posts: 196
| RE: Disable Alarm
Can't you just disconnect the plug that's connected the alarm siren? |
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Braingears
Expert
Date registered: Apr 2006
Location: St Petersburg, FL
Vehicle(s): G320 & ML320
Posts: 1450
| RE: Disable Alarm
ychung - 1/1/2018 6:06 PM Can't you just disconnect the plug that's connected the alarm siren? The lights would still flash... |
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| RE: Disable Alarm
Is this the one you just did a transplant in? Including the ECU and other electronics? |
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paulunm
Veteran
Date registered: Jan 2015
Location: Los Angeles
Vehicle(s): 2000 G500
Posts: 124
| Re: Disable Alarm
You might try adjusting the hood sensor bracket on the firewall. |
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BlueG
Elite Veteran
Date registered: Aug 2009
Location: DC
Vehicle(s): 2003 G500
Posts: 714
| Re: Disable Alarm
You should have 5 door switches and a hood switch. Even if you're not replacing them you may try cleaning contacts or the like just to see if that fixes it. |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| RE: Disable Alarm
There was a run of bad door/hood switches that had crumbly plastic parts on the inside. I had to replace all of mine as they failed one by one. If the dome light isn't on when the alarm gets tripped then you can assume that the switch that triggered the alarm is the under-hood switch. It sits on a bracket that can be bent upwards to ensure contact. You can also pull the connector off of the switch without any other side effects.
Edited by AlanMcR 1/2/2018 2:47 PM
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Braingears
Expert
Date registered: Apr 2006
Location: St Petersburg, FL
Vehicle(s): G320 & ML320
Posts: 1450
| RE: Disable Alarm
I've disconnected the hood sensor in order to test and rule it out. I haven't attempted to swap all of the doors yet. I was attempting to target the problem location in the unit. This problem has existing before any of the engine changes were made, and have still persisted afterwards. |
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colsG55
Veteran
Date registered: Aug 2013
Location: Dubai
Vehicle(s): G55 Classic 2000, TD5 110, 200 Series Land Cruiser
Posts: 209
| Re: Disable Alarm
Mine was going off randomly so I ended up cutting the wire to the siren. |
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Braingears
Expert
Date registered: Apr 2006
Location: St Petersburg, FL
Vehicle(s): G320 & ML320
Posts: 1450
| RE: Disable Alarm
Which controller box is responsible for the alarm? Is it common with any other car or truck? |
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paulunm
Veteran
Date registered: Jan 2015
Location: Los Angeles
Vehicle(s): 2000 G500
Posts: 124
| Re: Disable Alarm
Any progress? I am still having very intermittent alarm sounding, replaced the sensor, then unplugged- still sounds- seems to happen when the truck is hot. |
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| RE: Disable Alarm
Braingears - 1/3/2018 8:18 PM
Which controller box is responsible for the alarm? Is it common with any other car or truck?
K40 Relay located in the electronics box under the hood in front of the passenger. |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| RE: Disable Alarm
DUTCH - 2/4/2018 4:56 PM Braingears - 1/3/2018 8:18 PM Which controller box is responsible for the alarm? Is it common with any other car or truck? K40 Relay located in the electronics box under the hood in front of the passenger. The K40 includes the horn relay, but that isn't the same horn that is used for the alarm. That one is hidden under the brake booster (on mine).
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Braingears
Expert
Date registered: Apr 2006
Location: St Petersburg, FL
Vehicle(s): G320 & ML320
Posts: 1450
| RE: Disable Alarm
Has anyone attempted to unplug it? How does it interact with the rest of the systems? |
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| RE: Disable Alarm
Braingears - 2/6/2018 3:17 AM
Has anyone attempted to unplug it? How does it interact with the rest of the systems?
Unplug what? |
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 465
| Re: Disable Alarm
You can remove the wires to the siren and all will work fine. It's located way up top..towards the front..under the driver side wheel well.
I'm betting it's the siren's built in batteries..they corrode over time and randomly set off the alarm. |
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 465
| Re: Disable Alarm
Here's a thread of interest on the issue.
You can see what the inside of the siren looks like.
http://www.pointedthree.com/disc/forums/showthread.php?tid=22484&po... |
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paulunm
Veteran
Date registered: Jan 2015
Location: Los Angeles
Vehicle(s): 2000 G500
Posts: 124
| Re: Disable Alarm
I had assumed the pre MBUSA Gs don't have a siren battery- is that incorrect?
That may be the cause of my random alarm, but it's never happened when driving- only parked/locked.
Edited by paulunm 2/8/2018 1:21 AM
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| Re: Disable Alarm
paulunm - 2/8/2018 1:20 AM
I had assumed the pre MBUSA Gs don't have a siren battery- is that incorrect?
That may be the cause of my random alarm, but it's never happened when driving- only parked/locked.
No siren on my 2000 G500. |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| Re: Disable Alarm
Possibly it was optioned out. Look under the brake booster.
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