BMW K bikes (Bricks)


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1Back to top Go down   Crazy HES wiring Empty Crazy HES wiring Thu Oct 06, 2022 1:31 pm

robmack

robmack
Life time member
Life time member
So I had a defective K75 HES sensor plate from a 1987 model and decided to dissect it.  Here's what I found:
Crazy HES wiring Img_3910

The wires exiting the Hall effect sensors is as expected in accordance with Honeywell documentation - Red=+, Black=-, Green=Signal

But the wires within the BMW cable don't conform to any reasonable standard - + = Black, - = Orange, HES #1 signal = Red, HES #2 signal = Brown.  

According to the K75 schematic I have, the BMW colours should be + = Red, - = Black, HES #1 signal = Orange, HES #2 signal = Brown.

Although the wire colours don't make sense, there is also a discrepancy in between the BMW schematic and the actual wiring.  I presume that the pin allocation on the connector is correct despite the discrepancy.


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Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

2Back to top Go down   Crazy HES wiring Empty Re: Crazy HES wiring Fri Oct 07, 2022 3:59 am

charlie99

charlie99
VIP
VIP
i seem to recall that there were quite a few , discrepancies in the wiring colour rob , but worked all the same  ,, a bit like tank wiring which i have found confusing but when metered out , proved ok


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

3Back to top Go down   Crazy HES wiring Empty Re: Crazy HES wiring Fri Oct 07, 2022 3:53 pm

Dai

Dai
Life time member
Life time member
Yep - looks right to me. After my experiences trying to make sense of the HES wiring, I came to the conclusion that BMW do something crazy in the ICU along the lines of a series/parallel connection.


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1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

4Back to top Go down   Crazy HES wiring Empty Re: Crazy HES wiring Fri Oct 07, 2022 9:29 pm

duck

duck
Life time member
Life time member
I don't get why BMW (or Bosch) would use black for ground and brown for a signal when everything else on a K uses brown for ground.

Crazy HES wiring UADS8Kt


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
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