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Mazda 6 TS Auto 2008 UK model.

The car was left at an airport for 3 weeks. When I returned to pick up the car, the parking staff
informed me that the battery had become flatened and that they had jump started it, as they had left
the car running, I drove it home approx 100 mls.

Later that day, the alarm started going off for no reason, whilst the car was parked.
It would reset OK using the key fob. But would go off again sometimes in the middle of the night,
much to the annoyance of my neighbours.

Having looked on this site for possible solutions, I first decided to buy a new battery with a higher
Amp Hour rating. This stopped the random alarm activation for about a week, then they started again.

I was reluctant to take the car to a Mazda dealer, as I don't have much faith in them from past experience.
The rear door locks appear to be a problem for some owners but I convinced myself that these were not the cause here.

In looking to find a fuse that I could remove to silence the alarm, (the horn fuse does not disable the alarm siren
by the way), I separated the multiway connector underneath the fuse box cover. This revealed that one
of the pins had become tarnished causing the platic around the pin socket to become discoloured.

Having disconnected the battery I cleaned the pin and socket, then gently teased the metal part of the socket
to one side in order to force the female part to make a tighter contact with the pin. If the pin and socket were too
badly corroded I would have cut the appropriate wires and joined them together outside of the plug and socket.

The alarm has not sounded for approx 2 months now, so I consider it Fixed.

Thanks for the input from other forum members who's help guided me to fixing my problem.

See Photo's.
 

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Hi RustyNuts
Many thanks for this info.
I have had the same problem with my 2010 SL estate for the last 2 years.
After reading your item above, I decided to check my multiway connector.
Amazingly, it was exactly the same as yours so I have cleaned it up and given it a dose of WD40.
Hopefully it will work as well as your solution appears to have worked for you.
Fingers crossed ! .... and thanks again.

 

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Mazda 6 TS Auto 2008 UK model.

The car was left at an airport for 3 weeks. When I returned to pick up the car, the parking staff
informed me that the battery had become flatened and that they had jump started it, as they had left
the car running, I drove it home approx 100 mls.

Later that day, the alarm started going off for no reason, whilst the car was parked.
It would reset OK using the key fob. But would go off again sometimes in the middle of the night,
much to the annoyance of my neighbours.

Having looked on this site for possible solutions, I first decided to buy a new battery with a higher
Amp Hour rating. This stopped the random alarm activation for about a week, then they started again.

I was reluctant to take the car to a Mazda dealer, as I don't have much faith in them from past experience.
The rear door locks appear to be a problem for some owners but I convinced myself that these were not the cause here.

In looking to find a fuse that I could remove to silence the alarm, (the horn fuse does not disable the alarm siren
by the way), I separated the multiway connector underneath the fuse box cover. This revealed that one
of the pins had become tarnished causing the platic around the pin socket to become discoloured.

Having disconnected the battery I cleaned the pin and socket, then gently teased the metal part of the socket
to one side in order to force the female part to make a tighter contact with the pin. If the pin and socket were too
badly corroded I would have cut the appropriate wires and joined them together outside of the plug and socket.

The alarm has not sounded for approx 2 months now, so I consider it Fixed.

Thanks for the input from other forum members who's help guided me to fixing my problem.

See Photo's.
I have had this same problem following your post I disconnected the connector and voila, the exact same image as your picture. I couldn't really see what the discoloration was but wiped clean easily and sprayed with electronic contact cleaner, fingers crossed and thanks. Anyone know why this is?
 

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Hi that's seems a good idea I have the same problem I'm not mechanically minded I tried to unplug the multiway connector there's a clip that undoes but it just comes up at an angle I didn't want to force the block out but shouldn't it just pull out after unclippiing it ?
Mazda 6 TS Auto 2008 UK model.

The car was left at an airport for 3 weeks. When I returned to pick up the car, the parking staff
informed me that the battery had become flatened and that they had jump started it, as they had left
the car running, I drove it home approx 100 mls.

Later that day, the alarm started going off for no reason, whilst the car was parked.
It would reset OK using the key fob. But would go off again sometimes in the middle of the night,
much to the annoyance of my neighbours.

Having looked on this site for possible solutions, I first decided to buy a new battery with a higher
Amp Hour rating. This stopped the random alarm activation for about a week, then they started again.

I was reluctant to take the car to a Mazda dealer, as I don't have much faith in them from past experience.
The rear door locks appear to be a problem for some owners but I convinced myself that these were not the cause here.

In looking to find a fuse that I could remove to silence the alarm, (the horn fuse does not disable the alarm siren
by the way), I separated the multiway connector underneath the fuse box cover. This revealed that one
of the pins had become tarnished causing the platic around the pin socket to become discoloured.

Having disconnected the battery I cleaned the pin and socket, then gently teased the metal part of the socket
to one side in order to force the female part to make a tighter contact with the pin. If the pin and socket were too
badly corroded I would have cut the appropriate wires and joined them together outside of the plug and socket.

The alarm has not sounded for approx 2 months now, so I consider it Fixed.

Thanks for the input from other forum members who's help guided me to fixing my problem.

See Photo's.
Hi
How is it now ? I just took mine off and hey presto exactly the same . I cleaned off lightly with softish wire brush and put a drop of wd40 on . I might need to do it properly as still not clean but ridiculous wind here atm .keeping fingers crossed lol
 

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Oh dear after I put a bit of wd40 on it I then put bit of contact cleaner on as I thought better. When I plugged back in the eml came on . I realised I should've disconnected battery first before cleaning the connector ? I dis connected it for half hour and now the lights gone out but after driving it stalls at every junction? God knows what I've done now ?
 

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Oh dear after I put a bit of wd40 on it I then put bit of contact cleaner on as I thought better. When I plugged back in the eml came on . I realised I should've disconnected battery first before cleaning the connector ? I dis connected it for half hour and now the lights gone out but after driving it stalls at every junction? God knows what I've done now ?
Rang auto electrician and he said after disabling the eml light it takes about 30 miles driving to reset it all like the idle etc so that's all it is thankfully
 

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Mazda 6 TS Auto 2008 UK model.

The car was left at an airport for 3 weeks. When I returned to pick up the car, the parking staff
informed me that the battery had become flatened and that they had jump started it, as they had left
the car running, I drove it home approx 100 mls.

Later that day, the alarm started going off for no reason, whilst the car was parked.
It would reset OK using the key fob. But would go off again sometimes in the middle of the night,
much to the annoyance of my neighbours.

Having looked on this site for possible solutions, I first decided to buy a new battery with a higher
Amp Hour rating. This stopped the random alarm activation for about a week, then they started again.

I was reluctant to take the car to a Mazda dealer, as I don't have much faith in them from past experience.
The rear door locks appear to be a problem for some owners but I convinced myself that these were not the cause here.

In looking to find a fuse that I could remove to silence the alarm, (the horn fuse does not disable the alarm siren
by the way), I separated the multiway connector underneath the fuse box cover. This revealed that one
of the pins had become tarnished causing the platic around the pin socket to become discoloured.

Having disconnected the battery I cleaned the pin and socket, then gently teased the metal part of the socket
to one side in order to force the female part to make a tighter contact with the pin. If the pin and socket were too
badly corroded I would have cut the appropriate wires and joined them together outside of the plug and socket.

The alarm has not sounded for approx 2 months now, so I consider it Fixed.

Thanks for the input from other forum members who's help guided me to fixing my problem.

See Photo's.
Hi that's great I just saw a fix on yt he rerouted the green alternator wore where can I buy the whole multiway part please
 

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I have the same issue and have cleaned it a bit but my wires look charred so was considering a new loom. Anyone know what the connection that gunks up is going to? Also has anyone replaced the entire loom? Thanks
 

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Hey all. Same issue here, alarm going off about twice a day.. Multipin fusebox connector showing the same thing at pin 1, almost a little burnt looking discolouration. Tried contact cleaner with no joy. So I'm planning on hardwiring around the connector just for that pin. Can anyone offer any advice on how to access the wires underneath? I'm confident enough with splicing the wires, but don't have much auto-specific experience.

Help much appreciated!

Cheers.
 

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I’ve cleaned mine up and it has stopped for the last 24 hours. But I called an auto electrician as mine looks like the wire has been getting hot so having it looked at and he says the alarm issue is linked to a lithium ion battery in the alarm module dying as the shelf life of the batteries is 8-10 years.
 

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I'm very grateful for this information, my friend was busy on Google and found this post while I was looking through the manual for the alarm fuse and warning light meanings. Similar story, 2010 Mazda6 Sport. 2 weeks at the airport saw the battery off, I was confident at 9 years old it wanted a new one, did that. Never had any alarm issues until 1 year later it started the random alarming, sometimes day, sometimes night. Then after 3 weeks inactivity while we were away (neighbour had the keys and reset a number of alarms) I opened the boot and the release/closure motor was slow. Suspecting a low battery I charged it for over 6 hours, still not full but a good motorway run will have sorted that now. So today we started looking for parasitic current draw using multimeters that were capable of maximum 300mA. These were measuring of the scale. We think this was due to limitations in our test method rather than the actual fault then found this post and noticed exactly the same thing as the photos on the same pin. Interestingly this one pin/slot appeared to have been filled with a creamy coloured grease, wondering if this is a deliberate Mazda service fix to a known defect. It didn't look like the residue you might expect from a corroded or arcing connection but more like a thermal conductive paste you might use on an PC heat sink. I'd love to know more about this, too soon to know if we've fixed the alarm problem or battery drain. Has anyone worked out what this pin does and where it might be losing current to? And the lithium ion battery in the alarm sounds interesting, some sort of backup and can it be replaced? Wonder how this might or might not be linked to the corroding pin.
 

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Mine also had the paste you described it hasn’t seen a Mazda dealer for 5 years and I have since cleaned it up cleaned and it has now gone around 36 hours without an alarm sounding. I put mine on a trickle charger and it took over 3 days to charge up. The other I have cars take around 24. (Was topping them all up during lockdown). It is a slightly bigger battery but it is also the newest only a year old. It’s going in on Tuesday to a local auto electrician who suggested the lithium ion battery in the alarm module but he did say it’s quite hard to access. Mine went off when the alarm wasn’t even set and it only went off for a short duration before I cleaned it up. I’ll update late Tuesday/Wednesday if I find out more.
 

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Mine also had the paste you described it hasn’t seen a Mazda dealer for 5 years and I have since cleaned it up cleaned and it has now gone around 36 hours without an alarm sounding. I put mine on a trickle charger and it took over 3 days to charge up. The other I have cars take around 24. (Was topping them all up during lockdown). It is a slightly bigger battery but it is also the newest only a year old. It’s going in on Tuesday to a local auto electrician who suggested the lithium ion battery in the alarm module but he did say it’s quite hard to access. Mine went off when the alarm wasn’t even set and it only went off for a short duration before I cleaned it up. I’ll update late Tuesday/Wednesday if I find out more.
Thanks, that's great information. I've had this car from new, first as a company car and then bought and run for nearly another 6 years. Similarly it hasn't been to Mazda in those 6 years, just to a Japanese car specialist for annual servicing and update of the electronic service record. The battery was my only expenditure on the car apart from tyres, brakes and consumables so any cost resolving this little issue will be insignificant in the scheme of things and the car is definitely a keeper. Any further updates would be greatly appreciated :)
 

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By contrast mine has just had a new battery, 2 weeks ago, which hasn't made any difference. Issue was there before the old one died. I suspect that the alarm going off twice a day whilst it was sat on the drive during lockdown didn't help..
 

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I suspect the new battery doesn't really help, I figure there's a parasitic current discharging the battery that has something to do with the alarm issue. Cleaning the multi plug terminals (everyone seems to agree it's the same pin in the top corner) might hopefully solve both problems.
Wilson 101 might be our best source of further info at this stage having found an auto electrician that has an idea what is going on. I'll also update the results of my work with any further steps taken.
 

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So turns out although my plug looked like crap it was total fine and it wasn’t burnt it just had a lot of dirt stuck to the grease. The auto electrician thinks they probably greased it in the factory. He did find a parasitic current draw from the cars Bluetooth module and has removed the module from behind the glove box as I have an aftermarket stereo so it’s no use to me anyway. So fingers crossed.
 

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Ah that's interesting. Having cleaned up the plug at the weekend we hoped we had it fixed but the alarm went off twice again yesterday. I might try to hunt down the Bluetooth module then and make more effort to measure that parasitic current draw properly. Presumably that same draw is what's triggering the alarm.
 

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Hi guys,
First time poster, but long time(ish) watcher of this thread. My Mazda 6 started doing this approx 8 weeks ago. I also replaced my battery, which worked for about a week. I then saw the comments about cleaning the connectors. Pictures were exactly how mine looked, so thought “ah-ha that’ll be the problem”, so cleaned it up and that worked, but only for about 5 days. I’ve resorted to leaving the car unlocked, which hasn’t really been a problem whilst it’s predominantly been sat on my drive for 5 months. But I would very much like to get it resolved like everyone else.
The info from Wilson101 sounds extremely feasible, as whilst the car’s been sat idle for so long that lithium ion battery will have drained. I’ve also had a dodgy inconsistent Bluetooth connection since replacing the main battery, so had attributed it to that, but it would also be explained by the lithium battery issue.
Looking forward to Wilson101’s next update.
Cheers
Chatters
 

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My alarm hasn’t sounded since but only been 24 hours but my car isn’t used much. I’ll check the voltage in the morning and update.
 
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