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Old 05-06-2011, 12:29 AM   #1
deluxman
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Default How to remove Mazda 3 battery box?

I am trying to replace the No.4 engine mount on my 2005 Mazda 3 2.3S which is located under the battery box. However, I am having difficulty trying to disconnect the PCM connectors that are located on the side of the battery box which prevented me from being able to remove the whole battery box. If anyone know how to disconnect the PCM connectors with picture, I would really appreciate it. I have done research on the service manual but there is no detail explanation on how to disconnect the PCM socket.

Thanks for the help, mazda mania!!
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Old 05-06-2011, 08:12 AM   #2
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Default Re: How to remove Mazda 3 battery box?



Maybe it's different on the 04-05's, but on my 2006 I didn't have to mess with any of the ECU stuff when I took out my battery box...just remove the battery, then there's a couple bolts in the bottom of the box and it just comes out.
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Old 05-06-2011, 10:25 AM   #3
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Default Re: How to remove Mazda 3 battery box?

Yeah, on the 05, the PCM is attached to the battery box.
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Old 05-06-2011, 10:59 AM   #4
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Default Re: How to remove Mazda 3 battery box?

I don't have any pictures but I'll try my best to explain it:
  • 1. First remove the cover to the ECU and harness.

  • 2. Now that you are looking at the harness, you'll notice the white/beige/tan U shaped clip that is on the harness. This is the lock. Take a flat head screw driver and gently wedge it between the clip and the harness block.

  • 3. Now you will pry on the screw driver gently toward the battery box and this will pull the lock out and up. You'll probably have to pull it up the rest of the way by hand.

  • 4. Now you can just pull the harness off.

Keep in mind that this requires ZERO force and is very easy to take off, which also makes it easy to break if you go in and manhandle the job.
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Old 05-06-2011, 11:04 AM   #5
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Default Re: How to remove Mazda 3 battery box?

Hmm...I will try to take a picture and maybe if you can draw some direction on which direction to remove the lock that will be helpful. I did figure that the white shaped clip is the lock but I just have no clue on how to loosen it. Also, you know how long the driver side mount and the No.1 engine mount (rear mount) usually last? My car has 102k miles already and my No.3 mount already replaced twice and none of the No.1 and No.4 have been replaced.
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Old 05-06-2011, 11:40 AM   #6
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Default Re: How to remove Mazda 3 battery box?

I replace all of mine with stiffer aftermarket mounts so I have no idea. Probably wouldn't hurt to just replace it at this point though.

If you look at the clip lock you can see a little notch at the top, that's where you need to put the screw driver and just pry up.
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Old 05-06-2011, 11:45 AM   #7
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Default Re: How to remove Mazda 3 battery box?

May I know which aftermarket mounts did you buy. If you can provide the link, that will be great. Thanks!
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Old 05-06-2011, 11:48 AM   #8
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Default Re: How to remove Mazda 3 battery box?

My computer is acting up but I got mine from street unit. I can't load the page now to get you links, work internet is hit or miss today.
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Old 05-06-2011, 11:53 AM   #9
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Default Re: How to remove Mazda 3 battery box?

Is the street unit a lot better than the stock ones? How about in terms of the price? I paid close to $200 for all 3 mounts. On the label it says Made in Japan, though which I hope is better. Do you know if the stocks are also Made in Japan? On the Street Unit website, I notice they only sell for Mazdaspeed 3 though, do they have for the regular 3? Where are Street Unit mount made?
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Old 05-06-2011, 04:38 PM   #10
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Default Re: How to remove Mazda 3 battery box?

Dugger_8,

BINGO!! I was able to remove the harness socket per your instruction. Thanks a bunch!!!
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