HELP - - No Speedometer or Odometer

r1100sp · 06-27-2009, 07:51 AM

Hello to all. In just a short time as a member, I've received and am thankful for a great deal of advice and friendly comments about questions I've asked in PM's. I sure could use some help now.

I've successfully completed an "ABSectomy" (as Ralf called it) to my 2002 "S". The servo and all lines have been removed. I believe the bike had the ABS II system? I've installed new micro-switches at the lever and pedal for the brake light and wired directly to the proper fuse with no issue. The tailight is also directly wired to the proper fuse and works fine. Both front and rear ABS wheel sensor rings were removed. The front sensor and wiring have been removed but the rear sensor remains in place to seal the hole in the rear end. Spiegler SS braided lines complete the mod with great results. After a short ride last night, the bike functions great with one exception...I have an inoperative speedometer/odometer.

Thinking the ABS sensor ring on the rear wheel functioned as the speed sensor - I re-installed the ring. No success. (The ring/sensor gap is in spec.)

I re-installed the blue, ABS relay thinking the speedo/odo system was somehow wired through this relay. No success. (These checks were done by placing the bike on the center stand and briefly engaging 1st gear while running.)

Although I have a service manual, I appears it's for a previous model year as the illustrations (ex. ABS rear sensor, servo unit, etc.) do not look like my 2002. Unfortunately, I do not have a wiring schematic either.

I would greatly appreciate input to help me fix the problem. If the solution is too long to type (!), you could provide a phone number through a PM and I'd be happy to call you back to speak directly.

thank you very much in advance, Pete

wera32 · 06-27-2009, 10:51 AM

Hey there sp. The "rear sensor remains in place to seal the hole in the rear end" is your speedo sensor, not the ABS sensor. Hook it back up. The ABS sensor mounts under the caliper but does not go into the rear drive.

r1100sp · 06-27-2009, 10:17 PM

wera, I'm away from home presently but I'm fairly sure I have only one sensor on the rear drive and that's the ABS sensor. It's mounted horizontally, is located directly beneath the caliper and passes completely through a portion of the rear end to form a .45mm to .55mm gap to the stamped, stainless-steel ring. When removed, this plastic sensor is about 15mm in diameter and about 50mm long and the end forming the gap to the ring contains the metal pick-up. The service manual identifies this ring as an "ABS ring". As evidenced by my friend's '03 BCR, non-ABS bikes have a speedo sensor on the rear end (also black plastic but a slightly different shape) that mounts vertically and picks up a signal from a rotating part inside the rear end.

If I'm correct in only one sensor on the rear end of a 2002 ABS bike, I don't believe it also functions as the speedo sensor. This sensor was never removed in my modification process - just the ABS ring.

Quote:

Thinking the ABS sensor ring on the rear wheel functioned as the speed sensor - I re-installed the ring. No success.

I appreciate your comment, wera, but I'm really puzzled here. I might have the skills to try to decipher a wiring schematic for a 2002 ABS bike and attempt to locate the speedo/odo sensor. Might anyone have a link to such a diagram?

thank you, Pete.

r1100sp · 06-27-2009, 10:56 PM

wera, I've looked through another post with tons of photos and I see your point. Non-ABS bikes (seemingly of any year) have the one vertical speed sensor I spoke of. Earlier than 2002 ABS bikes have TWO sensors - one vertical speed and one horizontal for the ABS just below the caliper.

Here's a shot of my ABS bike with the one sensor below the caliper.

Hope this clears things up a bit. Question is, where does the bike pick up the speed signal?

wera32 · 06-28-2009, 05:07 AM

Ok, I'm guessing now but my RC51 uses a sensor on the transmission for speed sensing. Perhaps BMW did the same? My BCP is an '02, no ABS and has the vertical, rear drive mounted, speedo sensor. I've never noticed one like yours before.

shreddr · shreddr's Garage

on my 03' BCR the speed sensor was part number 3 in this fiche.

AZ-Twin · 06-28-2009, 06:26 AM

R1100SP,

This site has parts diagrams, perhaps it will be helpful.

http://www.realoem.com/bmw/select.do?kind=M&series=K75&body=ohne&model=R1100S&zone=USA&arch=0

r1100sp · 06-28-2009, 08:49 AM

Quote:

Ok, I'm guessing now but my RC51 uses a sensor on the transmission for speed sensing. Perhaps BMW did the same?

Could very well be, wera...I'll try to locate something. But my gut says the speedo somehow gets its signal from that same ABS sensor. Since the servo is removed and its master 42 pin connector is now disconnected, I wonder if the sensor can no longer transmit a signal to the speedo. One way to confirm, of course, would be to place the servo back in the bike, re-connect the 42 pin connector, start the bike, put it in 1st. and see what happens.

shreddr...exactly. That's the only sensor on the rear end of a non-ABS bike - I believe from '99 through '04. ABS bikes pre-'02 had an additional sensor that looks like my ONLY sensor. '02 - '04 ABS bikes seem to have only one sensor that "does both"

AZ...thanks for the link - some excellent info. Unfortunately the wiring diagram section only shows illustrations of the booklets available for specific areas. You can't click on the booklet and open its contents.

I could sure use a wiring diagram for an '02 with ABS but at this point, this plan of attack seems to make sense:

- pull all the bodywork and tank back off the bike
- re-install the servo and connect the master connector
- hope for the best

Come Monday, I'll have to shoot down to my local dealer, speak with the mechanic and hope he's in one of his rare good moods and will answer my questions.

Any other thoughts or a wiring diagram would be greatly be appreciated. Thank you.

KMoore · 06-28-2009, 09:38 AM

Not sure if this is any good to you, may not cover your year?

http://www.turboferret.co.uk/vehicles/R1100swiring.php

r1100sp · 06-30-2009, 07:56 AM

Hey gang. Here's the latest. (and thank you, Kevin. The wiring diagrams were very helpful.) And to correct: bike is a 2002 with ABS III brakes. (BMW on the front calipers - not Brembo) I was mistaken saying it was ABS II.

I've confirmed the rear ABS sensor also sends a signal to the speedo/odo and does so through the ABS/servo unit. I was not able to successfully by-pass the unit when it was removed by wiring the sensor directly to the speedo. Consequently, the ABS unit is re-installed, the 42 pin connector in place, my brake micro-switches removed and the OEM switches (with the odd "open circuit when depressed - closed circuit when actuated) in place. The bike works fine and I know how fast and far I'm going,

but....

Each brake micro-switch not only operates the brake light but sends power to the servo unit. Consequently, when the lever or pedal are used, the servo motor is actuated. However, it has nothing to pump as the lines are removed and the fluid drained. Now my task is to locate the specific wire(s) that branches from each switch and powers the servo. This is not as easy as it seems. Ideally, a diagram of the 42 pin connector showing which wire supplies power will clarify. So far, nothing shows such a diagram exists.

I've sent a couple PM's requesting help but, has anyone seen such a schematic? If so, I would sure like to see it!

thank you, Pete

BoxerRep53 · 06-30-2009, 09:08 AM

Instead of worrying about your speedo (who cares how fast you're going,it's still slower than me) why don't you fix your tail light? :-D

KMoore · 06-30-2009, 09:21 AM

Have you contacted Anton. He is on this forum.

Here is one of his pages re brakes and it has a contact at the bottom
http://www.largiader.com/abs/absfault.html

r1100sp · 06-30-2009, 03:56 PM

Kevin, although I have read that particular sheet on ABS reset codes by Anton, I have sent him a PM about my particular issue. I've also contacted the IBMW folks for assistance.

Thank you much for those links.

AntonLargiader · 07-01-2009, 02:14 AM

You need to power the ABS unit because it translates the HES signal from the rear wheel speed sensor into a signal that the instrument panel can process. I don't know that you can power it without having it respond to the lever switches also.

To really convert the bike to non-ABS I think you'd need to install a standard (AC inductance) speedo sensor in the final drive, wire that directly to the cluster, deal with the brake switches and ditch the servo unit completely.

Inputs:
pins 39, 40 - white/yellow and white/blue - front brake switch
pins 7, 41 - yellow/green and yellow/black - rear brake switch

Outputs:
pin 6 - gray/white - taillight
pin 4 - gray/yellow - brake light