obc question

[polsta]

picked up a 13 button obc today

not this one, but borrows jonnys pic (pic up this kit in for sale section)

ive put it in the garage, but just seen this pic, and dont remember seeing the black air duct thing, if its for a tech 1 , do i need this bit and what is it ? (and the obc function) or is it for the facelift or non kitted car ? or if i do need it and i have that piece removed fom my car, can it be modded to hold the sensor or whatever it is?

cheers

[danxs]

I think it's for outside air temp. Goes from the bumper duct to the arch liner

[jimbom30cab]

i think they are facelift only, don't recall seeing these ducts on my tech 1 but i know the facelift cars have them

have a look on realoem Polsta - might show where the outside temp sensor is fitted on the tech 1 cars

btw, where did you get your kit from, did you get a good price?

[polsta]

yes i know what the piece is, but im asking if its the same piece on a tech 1 kitted, as standard, and if i need that piece obc spoecific or just a case of modding the sensor in it

[Brianmoooore]

Sensor on a pre facelift fits into a hole in the front panel. LH side, under the bumper, IIRC.
It's a different sensor from the one in your pic. and has a different connector, but is electrically the same.

[polsta]

nice one brian thanks, as above with jim could not remember those ducts when taking my car apart but obv they are on the facelift, in that case i have no idea what sensor i have, il get the kit back out the garage and take some pics , is there any other obc differences in pre/post facelift and engine sizes or anything ?

jim i paid £100 for it- complete with stalk gong etc but the button unit is pristine with bright no bleed screen and imaculate buttons with no wear to the paint on them, but had some other results with the obc , making it an all round nice deal

[Rav335uk]

Karl, your Tech 1 should be fitted with the recatngle brake ducts as below.
No. 1 and 3

Air duct - BMW parts catalog

[polsta]

ok cheers rav, tbh i cant remember, ive got all the parts in boxes, but only dissmantled the car once a year ago after just driving ir round all summer , so never really worked on it and familiar with all parts

but either way, the sensor fits under the bumper doesnt it as brian says and not on the duct ?

[Brianmoooore]

If your car has the ducts with the mounting hole, then fit the sensor you have there.

[polsta]

ok il check, although would it have if it didnt have a factory obc ?

are there any other differences in the obc ? like the ecu or a coding plug or anything for different models ? if so , how do i check ?

[polsta]

just having a google, ive found this page...

http://www.e30tech.com/forum/showthread.php?t=80319

Coding plugs
OBC info: engine type, fuel injection type, tire size,
fuel tank capacity, fuel tank reserve capacity
318i 3-3 TYP 65-81-1-376-027
325e 3-8 TYP 65-81-1-373-698 84-9/86
325e 3-1.4 TYP 65-81-1-381-795 9/86-9/87
325e 3-1.4 TYP 65-81-1-385-941 9/87-
325i 3-1.2 TYP 65-81-1-381-793 up to 9/87
M3 3-1.1 TYP 65-81-1-381-792
528e 5-8 TYP 65-81-1-375-814 85-87
528e 5-1.3 TYP 65-81-1-385-031 88+
535i 5-6 TYP 65-81-1-375-826
M5 6-4 TYP 65-81-1-375-812
635CSi 6-2 TYP 65-81-1-375-021 85-87
M6 6-4 TYP 65-81-1-376-208
735i 7-4 TYP 65-81-1-375-823 85-87

...

Car Model Years Engine BMW Part Number
318 1982 to 9/1985 M10B18 65 81 1 375 816
320 1983 to 9/1987 M20B20 65 81 1 376 032
9/1987 on 65 81 1 385 939
w/ extra fuel tank 65 81 1 376 033 or 65 81 1 381 319
323 1983 to 9/1987 M20B23 65 81 1 376 032
325i 9/1987 on M20B25 65 81 1 385 941
325e 1983 to 09/1986 M20B27 65 81 1 373 698
10/1986 on 65 81 1 381 795
w/ extra fuel tank 65 81 1 381 320
318i/is 1989 to 09/1991 M42 65 81 1 394 111
M3 9/1987 on S14 65 81 1 380 891

what one do i need for a 325i dec 1986 build date / 87 E reg

325i 3-1.2 TYP 65-81-1-381-793 up to 9/87 ?


is there something written on the plug to tell what one you have ?

[polsta]

these have some good info too, what is the "fuel pump imobiliser" ? not heard that bfore with obc`s, is that just on these as standard on the wiring loom ?

http://zoso.no-ip.org/318i-obc.html


http://www.r3vlimited.com/tech/obc/obc.htm

http://www.unofficialbmw.com/repair_faqs/obc.html

[B7]

jim i paid £100 for it- complete with stalk gong etc but the button unit is pristine with bright no bleed screen and imaculate buttons with no wear to the paint on them, but had some other results with the obc , making it an all round nice deal

In which case Jimbo, you are getting a bargain matey.

[Rav335uk]

these have some good info too, what is the "fuel pump imobiliser" ? not heard that bfore with obc`s, is that just on these as standard on the wiring loom ?

http://zoso.no-ip.org/318i-obc.html


http://www.r3vlimited.com/tech/obc/obc.htm

http://www.unofficialbmw.com/repair_faqs/obc.html

It's a code you put into the OBC, but tbh, not worth it Karl.
Easily overcome.
Better of doing Brianmoores fuel cut off mod.

[jimbom30cab]

In which case Jimbo, you are getting a bargain matey

happy days

[jimbom30cab]

Polsta, i'm going to fit a 13 OBC to my car towards the end of April, you are welcome to come up and have a look whilst i do it, might answer a few of your Qs. Whilst you are there you i can show you the dash fitting and a few other bits if it would be useful to you.

[polsta]

ok no worries rav

Get on it jim happy days, i got a great all in bargain i didnt quibble the price tbh well happy


so anyone on this coding plug ??? is the bmw part number, or the other number written on the actual plug or can it only be determined by pressing the 1000 and other button to show te code ?

[Rav335uk]

YOu should be able to fit that OBC kit in about 4 hrs at a push.

[polsta]

Polsta, i'm going to fit a 13 OBC to my car towards the end of April, you are welcome to come up and have a look whilst i do it, might answer a few of your Qs. Whilst you are there you i can show you the dash fitting and a few other bits if it would be useful to you.

nice one cheers jim, i really dont think il attempt the dash and obc on my own, i think il need someone to come round and help me out and have a few cups of tea and biscuits

[polsta]

My coding plug says 4 6 typ 1385 941 ? Which on the above 1st lot is 325e 9/87 ?

[Cloggy Saint]

YOu should be able to fit that OBC kit in about 4 hrs at a push.

Including a 1 hour tea-break. I wouldn't bother fitting the horn and the relay box, as said, the immobilising function is fairly prehistoric.

[polsta]

YOu should be able to fit that OBC kit in about 4 hrs at a push.

Including a 1 hour tea-break. I wouldn't bother fitting the horn and the relay box, as said, the immobilising function is fairly prehistoric.

how would the the relay box/imobiliser bit work in conjunction/interfere with a different (ie alarm) imobiliser ?

also, by looks of it i have a facelift code plug, if i cant change it or find a pre face, what difference would it make on a pre face ? just the mpg/range thing would be out ? yet its not that accurate anyway is it ?

[Brianmoooore]

Just had a closer look at the pic. in the OP.
The external temp. sensor shown pushed into the brake air duct doesn't appear to be a facelift one, which should have a socket on it, with a yellow plug pushed into it, similar in layout to a 'blue' temp. sensor on the engine. The sensor in the pic. looks like it might be a pre facelift one.

If the OBC loom is fitted with a factory or dealer fitted BMW alarm, the immobiliser pair of wires from each unit are connected with one wire from each to the immobiliser socket in the car's loom (two green wires, above the glovebox area), and the other wire of each immobiliser pair joined together.

[polsta]

thanks brian, do you mean the alarm (if there is one) would be inside the ecu box thing or seperate ? any way to tell ? is the imobiliser thing worth fitting or just totaly leave out ? im thinking if it can be fitted and it works, then why not as its another security feature added

i can get the fella who fitted my alarm to pop over once im at the suitable stage for an hour or 2 and have a good look through all the cars wiring and give everything a good look over and wire the stereo in too, as i had no stereo loom but ive got one now, and a blaupunkt memphis, whilst all the dash and interior is out its worth getting it all seen to properly isnt it

[bab-91]

I had the same problem, I bought a face lift version and tracked down the correct brake duct set in the States.




It doesn't fit but I'll work something out

[ajay]

Early and later e30 temp sensors.

[polsta]

thanks ajay nice one, i need to get down my garage and have a rummige and find the duct

anyone know exactly what difference a facelift 325 coding plug would make in a pre face 325 ?

[jimbom30cab]

POlsta, I have a facelift 325 plug so will test it in the tech 1