how do i set my obc to mph and deg f?does this thing do anything else i should know?
thanks
dave
obc settings
Push the mileage button so it displays L/100km and then use something pointy to push the small reset button on the bottom right of the front button panel. Push it once until it displays MPG. Then it will display mileage in MPG, degrees in F and the time and date will be in the US standard 12 hour format.
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Blue Shadow
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- Location: SE PA
http://home.att.net/~ebaines/e28_obc.htm
and pressing the 1000 and the 1 together will tell you which TYP chip is in the coding plug in the back of the unit.
and pressing 100 and 1 together will tell you the remaining liters of fuel in the tank.
or did I get those backwards?
and pressing the 1000 and the 1 together will tell you which TYP chip is in the coding plug in the back of the unit.
and pressing 100 and 1 together will tell you the remaining liters of fuel in the tank.
or did I get those backwards?
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lkfoster
- Posts: 490
- Joined: Feb 12, 2006
- Location: Phoenix, AZ sometimes. Fishkill, NY at the moment
I think it's the reverse. But I've been known to be wrong.Blue Shadow wrote:http://home.att.net/~ebaines/e28_obc.htm
and pressing the 1000 and the 1 together will tell you which TYP chip is in the coding plug in the back of the unit.
and pressing 100 and 1 together will tell you the remaining liters of fuel in the tank.
or did I get those backwards?
I always wondered what the "code" button was... Do all the cars have these car alarms? If I set up a code, and attempt to start it 3 times.. Will an alarm go off on my car as well?Blue Shadow wrote:http://home.att.net/~ebaines/e28_obc.htm
and pressing the 1000 and the 1 together will tell you which TYP chip is in the coding plug in the back of the unit.
and pressing 100 and 1 together will tell you the remaining liters of fuel in the tank.
or did I get those backwards?
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lkfoster
- Posts: 490
- Joined: Feb 12, 2006
- Location: Phoenix, AZ sometimes. Fishkill, NY at the moment
Different code. The coding plug refered to above tells the ODC things like gear ratios.BMWgiant wrote:I always wondered what the "code" button was... Do all the cars have these car alarms? If I set up a code, and attempt to start it 3 times.. Will an alarm go off on my car as well?Blue Shadow wrote:http://home.att.net/~ebaines/e28_obc.htm
and pressing the 1000 and the 1 together will tell you which TYP chip is in the coding plug in the back of the unit.
and pressing 100 and 1 together will tell you the remaining liters of fuel in the tank.
or did I get those backwards?
The code button on the front is the alarm. It will immobilize the ignition or starter, don't remember which. About all it's good for is getting a discount on your insurance. In real life all you have to do to clear the alarm is to pull the fuse.
The code button makes the main relay not turn on, which makes the ECU not function, i.e. no fuel or spark.lkfoster wrote:The code button on the front is the alarm. It will immobilize the ignition or starter, don't remember which. About all it's good for is getting a discount on your insurance. In real life all you have to do to clear the alarm is to pull the fuse.
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Blue Shadow
- Posts: 10532
- Joined: Feb 12, 2006
- Location: SE PA
lkfoster, It can't be the opposite, I mentioned that possibility. j/k
The coding plug allows using the same OBC in all the BMWs of that era, changing the OBC chip for the different car/motor possibilities. I doubt there is a need to modify the OBC programming for the diff ratio.
Phil, I know the covered adjustment will change the reading of the remaining fuel (liters) but I didn't know that this is an adjustment of the low fuel light which is triggered by the fuel gauge at 1.5 gallons. There is a connection between the OBC and the low fuel signal in the ETM but I have no idea what it allows.
BMWGiant, the OBC CODE function on the face of the OBC is discussed in the link in my first post in this thread. It does as Ron says and honks the OBC alarm horn for 30 seconds. This horn is under the triangular plate in the front battery compartment. This for the non-///M cars.
The coding plug allows using the same OBC in all the BMWs of that era, changing the OBC chip for the different car/motor possibilities. I doubt there is a need to modify the OBC programming for the diff ratio.
Phil, I know the covered adjustment will change the reading of the remaining fuel (liters) but I didn't know that this is an adjustment of the low fuel light which is triggered by the fuel gauge at 1.5 gallons. There is a connection between the OBC and the low fuel signal in the ETM but I have no idea what it allows.
BMWGiant, the OBC CODE function on the face of the OBC is discussed in the link in my first post in this thread. It does as Ron says and honks the OBC alarm horn for 30 seconds. This horn is under the triangular plate in the front battery compartment. This for the non-///M cars.
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lkfoster
- Posts: 490
- Joined: Feb 12, 2006
- Location: Phoenix, AZ sometimes. Fishkill, NY at the moment
I noticed when I was troubleshooting my original OBC that the range would make a step function change as soon as the low fuel light came on. I don't remember if it became more accurate though, just different. The OBC apparently over-rides the analog signal from the sending unit with the low level switch signal which would suggest that it self-calibrates.pdx 528e wrote:I'm glad I wasn't the only one confused about why this is. It would have been a great opportunity for the range on the OBC to be self calibrating.Blue Shadow wrote: There is a connection between the OBC and the low fuel signal in the ETM but I have no idea what it allows.
Calibration normally is manual. I set the OBC for 7 liters as soon as the low fuel light comes on using the 1000-1 button push trick.
Perhaps in the event that your level gauge is wacky, you'll still get the idea that its time to fill up (for the average owner who doesn't even count how many miles they get on a tank, instead relying on the range function). My dad's 300SD has never had a working fuel gauge since he bought it, but the empty light is very reliable. Its fortunate that those cars get a 50+ mile reserve.lkfoster wrote:I noticed when I was troubleshooting my original OBC that the range would make a step function change as soon as the low fuel light came on. I don't remember if it became more accurate though, just different. The OBC apparently over-rides the analog signal from the sending unit with the low level switch signal which would suggest that it self-calibrates.pdx 528e wrote:I'm glad I wasn't the only one confused about why this is. It would have been a great opportunity for the range on the OBC to be self calibrating.Blue Shadow wrote: There is a connection between the OBC and the low fuel signal in the ETM but I have no idea what it allows.
Calibration normally is manual. I set the OBC for 7 liters as soon as the low fuel light comes on using the 1000-1 button push trick.
On a diesel Benz, when the light comes on, the needle is buried in the E but you have several gallons left. The ones we have don't have a specific portion of the gauge marked as "reserve".Mr. E28 wrote:Speaking of which..what is the deal with the "reserve" part of the gooahj? Is it just to show you how much fuel you have after reaching the typical E mark on other cars? I have not been able to find a clear cut explanation.pdx 528e wrote: Its fortunate that those cars get a 50+ mile reserve.
Maybe its Reserve, I thought it was for Refuel. I had spaced that it doesn't have an E, but rather an R. Are you referring to the E28 gauge or the 300SD gauge? Thanks.Mr. E28 wrote:I see...I was under the impression that the little section before the typical full, half, and empty marks was the reserve (thought thats why it used an R). What does that section show?