Reset Oil Light: Lost Speedo, Odo, MPG Meter

[dnguyen1963]

The later boards (post 1990 I believe) use lithium batteries. They are much shorter than the regular AA that you see in stores. All replacement boards use lithium batteries. These boards disable the charging circuit so no worry about batteries blowing up on you.

[nando]

it depends on which version of the SI board you have, some are nicad, others are lithium.

[Kershaw]

works for me.

anyone know what model # the batteries are?

[dnguyen1963]

Unfortunately.... (above link)



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That's strange! I just clicked on the link and it took me to the page without any problem. I do not have an account with them either. If you continue to have problem then go to Google and search "E30 SI Board replacement". The first item should be the one...or try www.beckerelectronics.com

[Vivek]

Unfortunately.... (above link)



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[dnguyen1963]

Thanks...i've been busy with other stuff, but how hard is an SI board replacement? It's not the whole cluster, right (i'd like to keep the orig miles)?

Very easy...after you pulled the cluster, there is a single screw to remove and you can pull the whole SI board out. Here is the link...

http://www.beckerelectronics.com/SIboard/siboard.html

[Vivek]

A friend of mine with his m10 model had a similar issue (no mpg, tack) but his speedo "worked" just 30mph off. replace the si and all worked fine again

Thanks...i've been busy with other stuff, but how hard is an SI board replacement? It's not the whole cluster, right (i'd like to keep the orig miles)?

[JoeBaker75]

So I did the oil reset light procedure described here, as well as numerous other places, by sticking a paperclip in ports 7&19 and turning the key to position two. The oil light immediately went off, but I waited for over half a minute and the inspection light didn't turn off, so I just took out the key, put the port thing back on, and left it.

Fast forward two hours. I'm driving the car and notice that the speedo is at zero. Subsequently, the odometer doesn't turn, and the MPG meter under the tach is at 0 when pressing the gas, and goes to 40 when you let off. What the hell happened? I'm as sure as I can be that I used the right ports, and I've never heard of anyone having this issue before. Any help?

A friend of mine with his m10 model had a similar issue (no mpg, tack) but his speedo "worked" just 30mph off. replace the si and all worked fine again

[dnguyen1963]

How old is your radiator? The heat exchange between your radiator and the air is not sufficient...possible clogged radiator if your fan clutch is working ok. Your water pump might be going too.

[Vivek]

Okay more stuff. Now the car overheats if you go too slow. The clutch fan seems to be okay, but the fan in front of the radiator didn't seem to be spinning. Is it supposed to always spin?

If you go pretty fast (since the speedo doesn't work, i'm just guessing) around 80 or above, its perfectly fine, below half. It'll shoot up to red in a minute of going slow. It seems to have gotten worse and may or may not be connected to the other issues.

Any help anyone?

[dnguyen1963]

I guess tomorrow I'll try disconnecting the battery for 15 minutes and see if that does anything (might as well), if not, I'll take out the cluster and see what's up.

Take the cluster out...only a fifteen minutes job.

[Vivek]

I guess tomorrow I'll try disconnecting the battery for 15 minutes and see if that does anything (might as well), if not, I'll take out the cluster and see what's up.

[Riley103]

A bad SI board can do some real funky thing to the whole cluster even though the speedo is not supposed to be under its control.

I also think so.

[dnguyen1963]

Yeah, you can't believe how much damage 2 leaky NiCd can do to the SI board.

[nando]

it would have to be a hard short (ie completely fried). the function of the speedo is completely independent - although it does supply a VSS signal to the SI board. basically, the SI board would have to be shorting 12v to the signal wire from the speedo PCB.

it's probably worth checking the wires and connector at the diff - it could just be a coincidence. or perhaps you actually did totally fry the SI board.