General Category > R1150 models

K Line 1 Status: Stuck Low

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mferguson:
Reporting back on today’s experiment:
- side stand was not the comm issue (although did not test if it could cause comm issues)
- ignition voltage only shows up when bike is running - so that was nothing to be concerned about
- Unplugging the ABS unit solved the “K1 stuck low” condition - so clearly internal issue in ABS unit.
- can now communicate with engine ECU
- notes of interest:
     - ABS failed completely and suddenly mid ride - illuminating the “brake failure” light (solid on)        but no “!” Light. Was restricted to residual braking (this is the servo system)
     - regarding diagnostic lines - this bike does not appear to have a k2 line present - only k1 which further supports internal ABS failure
     - Pin-outs on this bike 04 dual plug, servo 1150gs:
           1: brown+black (k1?)
           2: none
           3: none
           4: brown (gnd?)
           5: none
           6: red+yellow (bat?)
           7: none
           8: none
           9: blue
           10: yellow+grey
Conclusion: looks like I need a new/used/rebuilt abs module. I like the servo brakes, so I will likely repair in one way or the other - I have a spare supposedly good used unit - will plug that into bike next and see what I have.

WayneC:
Good to hear you worked out the cause of the K LIne held low, it seems like there is an error in my spreadsheet of diags pins on bike models or there was a change during production of the R1150GS of putting ABS onto K-Line1

There is information in threads on the forum by JugHead re rebuilding ABS units, may be worth reading

mferguson:
Thanks Wayne. Studying wire diagrams and parts fiche it appears that the elimination of K2 on the 1150GS may correspond with the change to IABS and/or dual plug at the end of 2002. There was a new engine ECU that came with the dual spark in 12/02 per parts fiche. The IABS came in 9/02. Dual Plug wiring diagrams show a single K1 line used by both ECU and ABS. Single plug diagram shows K1 (ECU) and K2 (ABS).

I appreciate the help and will check out Jughead’s thread

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