Yoshi replaces his SI board batteries

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Yoshi replaces his SI board batteries

Postby Yoshi » Sun Oct 26, 2014 1:58 pm

I couldn't find much information about SI boards online. It was really weird.

If you want to save yourself a headache and get a board you know works I found this place: http://www.bavrest.com/si-boards.html

Basically, there are 4 different kind of boards. Early model/late model and lithium/NiCd. I think the NiCd batteries are wired in series and the Lithium are wired in parallel. BIG difference. But regardless, you just need to make sure you put the fresh batteries in the right orientation.

I had the Lithium batteries. They are half the width of AA batteries
Sanyo CR14250SE 3V/ 850mAh Lithium
http://www.radioshack.com/product/index ... ndSrc=cart

Warning: This is how I did it. It isn't the correct way. It works though.

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Here is my happy little SI board. The batteries read out at 0.75v. It's supposed to be 1.25v or something to be considered "still good". From here I took off the orange hot glue so that I could more easily desolder the batteries.

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Here's the highlighted areas of what you need to desolder. One pin has only one prong while the other side has 2. Kind of makes things a pain but it's not too bad.

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Now here's where I started to do stuff wrong. I couldn't find new tabs. So I used a tiny drill bit to drill out the plug "welds" to separate them from the batteries. New battery on the left, old on the right. Really, you're supposed to be able to buy new ones of these things online but I had no luck. A tutorial I read online said to scuff the battery with sand paper and to apply solder to it. Well I did that and solder wouldn't stick to it. So... My soluition?

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Hot glue that bitch! I made sure that there was a decent amount of contact and sanded down the contact pins. The bottom of the bored was soldered back in and tested to verify I got the 3+v I was supposed to get (also remembered the orientation of the batteries!). The hot glue should be pliable for longer than I drive the car. I'd really prefer solder but I was just verifying this would or would not fix my tach.

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Tada! My tach still doesn't work but at least my inspection meter does. And has some dead LEDs.
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Status: HG repair. 488wtq though!
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Re: Yoshi replaces his SI board batteries

Postby M20_fever » Mon Oct 27, 2014 1:59 am

meh, didn't solve the problem but at least its another thing off the list.
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Re: Yoshi replaces his SI board batteries

Postby Yoshi » Mon Oct 27, 2014 11:32 am

Is it bad I don't know what that inspection light is supposed to do? When I start up the car, "all" the lights are on for a bit, then I just get a red dot. I might actually hook back in the factory temp sensor for the cluster but lol eh.
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Re: Yoshi replaces his SI board batteries

Postby 87e30 » Mon Oct 27, 2014 10:50 pm

Yoshi wrote:Is it bad I don't know what that inspection light is supposed to do? When I start up the car, "all" the lights are on for a bit, then I just get a red dot. I might actually hook back in the factory temp sensor for the cluster but lol eh.


If I'm not mistaken they're just supposed to let you know when you're due for an oil change.
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Re: Yoshi replaces his SI board batteries

Postby Yoshi » Mon Oct 27, 2014 11:40 pm

so... I'm due for an oil change? lol.
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Re: Yoshi replaces his SI board batteries

Postby M20_fever » Thu Oct 30, 2014 2:53 am

87e30 wrote:If I'm not mistaken they're just supposed to let you know when you're due for an oil change.


exactly. Jump the reset pins in the diagnostic port and it will be full again. I think it takes the econometer and hours from the OBC to calculate interval between oil changes. Mines been on the red dot since I bought it, lol. Too lazy to jump those pins, or just buy the reset tool on ebay for like $10.
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Re: Yoshi replaces his SI board batteries

Postby 87e30 » Thu Oct 30, 2014 12:15 pm

I just change my oil before each trip of 500 miles or more. Between those I just add a little every time I'm low. I've never been one to do what I'm told so I'm damn sure not gonna listen to a red dot. lol
Schwarz 5-speed 87 325is (newest project)
Arktisblau 5-speed 86 325e (current DD)
Schwarz 5-speed 87 325e (parts car/LS1 swap?)
Gazellenbeige automatic 85 318i (70,000 miles)
Alpine white 5-speed 87 325is (my first e30, possibly for sale)
99 Suburban
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Re: Yoshi replaces his SI board batteries

Postby Yoshi » Thu Oct 30, 2014 3:21 pm

I figured it would have reset with the SI batteries since those are what's in charge of keeping the memory right? Plus, I don't have an OBC anymore so wouldn't that mean it would always read bad?

Also remember that I don't have the diagnostic port anymore :)
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Re: Yoshi replaces his SI board batteries

Postby 87e30 » Thu Oct 30, 2014 6:38 pm

Electrical tape over the lights?
Schwarz 5-speed 87 325is (newest project)
Arktisblau 5-speed 86 325e (current DD)
Schwarz 5-speed 87 325e (parts car/LS1 swap?)
Gazellenbeige automatic 85 318i (70,000 miles)
Alpine white 5-speed 87 325is (my first e30, possibly for sale)
99 Suburban
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Re: Yoshi replaces his SI board batteries

Postby M20_fever » Thu Oct 30, 2014 11:22 pm

"shit given" decal next to it?
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Re: Yoshi replaces his SI board batteries

Postby 87e30 » Thu Oct 30, 2014 11:36 pm

Reprogram the lights to look like Knight Rider?
Schwarz 5-speed 87 325is (newest project)
Arktisblau 5-speed 86 325e (current DD)
Schwarz 5-speed 87 325e (parts car/LS1 swap?)
Gazellenbeige automatic 85 318i (70,000 miles)
Alpine white 5-speed 87 325is (my first e30, possibly for sale)
99 Suburban
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Re: Yoshi replaces his SI board batteries

Postby Yoshi » Fri Oct 31, 2014 11:16 am

I could just take out the lights lol. Eh. already put all the trim and what not back. It's all sexy and factory looking again. I love how the car is starting to look like a real car again.
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Re: Yoshi replaces his SI board batteries

Postby Eskie » Sat Nov 29, 2014 7:29 pm

I just did this and ran into the same problem. The solder wouldn't stick to the batteries or tabs that I snapped off of the old batteries with a razor. I stumbled upon a YouTube vid of some guy soldering tabs onto batteries. He used flux on the batteries and tabs before he applied solder. I ran downstairs and found some old flux that I had that is for soldering copper plumbing pipes. Put that stuff on and voila..solder sticks now.

I'm not sure replacing the batteries helped though. I haven't reset the the indication by jumping the plug under the hood. I'm not even sure I know how it was supposed to work when it's fully functioning.

When I turn my key over all of the indicator lights are illuminated green..when I turn the car on they all go out. Is that how they are supposed to work?

I also re flowed all the connection on the board behind the gauge grounds while I was in there.
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Re: Yoshi replaces his SI board batteries

Postby Yoshi » Sun Nov 30, 2014 1:50 pm

I'm not sure. All my lights stay on for a while then it goes down to 1 red. So... I don't know. Maybe someone has the owner's manual somewhere can look it up. lol
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Re: Yoshi replaces his SI board batteries

Postby M20_fever » Mon Dec 01, 2014 6:59 pm

All lights should be lit when reset, and go out over time until only one red light is on, indicating it's time for a service (oil change).
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