question for the forum - K1200s abs controller not communicating

[dballari@gmail.com]

Hi - new member here - i own a BMW k1200s - recently i was flushing/bleeding the abs module. During the procedure, I had to unplug the electrical connector leading from the canbus system to the abs control unit (the unit that is connected to the pump) to temporarily turn off the brake servos. When i reconnected the electrical connector to the control unit, I no longer had any communication  through the control unit (no abs brake functions, no brake lights, no speedometer, etc.). It does not appear that i damaged any of the pins or the connector.  I believe I may have left the ignition in the "on" position when i was disconnecting the connector, so perhaps this may have created some issues.

My initial steps were to disconnect the battery and tie the battery leads together to see whether that would help reset the abs control unit - no luck unfortunately

Wondering whether anyone has any suggestions as well as thoughts on how to figure-out what is causing the communication failure ?

Also, anyone familiar with the connector and which pins control which functions (including ground and power?) - thanks in advance

[botus]

which age bike? - the early ones had the like to fail servo ABS module - once its dead its dead, often dies when undertaking maintenance  - many remove it and run without ABS


the various ABS disasters fitted by BMW

first iteration
34517685803
Pressure modulator, fully integral ABS
From:01.01.2004 To:- Weight:4.630 kg Price:$2720.72
Supersedes:
34517728205(11.12.2009 — )
Part 34517685803 was found on the following vehicles:•K589 (K 1200 RS, K 1200 LT)   (06/1997 — 12/2003)



Next disaster you can't fix
34517685788
Pressure modulator, fully integral ABS
From:01.02.2004 To:- Weight:4.610 kg Price:$2720.72
Supersedes:
34517728063(11.12.2009 — )
Part 34517685788 was found on the following vehicles:•K589 (K1200 GT, K 1200 RS, K 1200 LT)   (02/2003 — 07/2008)



the one almost worth having - but still dies with two reparable designed in failures
34517715109
Pressure modulator, Integral ABS, gen. 2
From:01.12.2007 To:- Weight:2.380 kg Price:$2198.08
Supersedes:
34517698969(01.08.2006 — 14.02.2008)
Part 34517715109 was found on the following vehicles:
•K25 (R 1200 GS)   (12/2002 — 12/2012)
•K25 (R 1200 GS Adventure)   (03/2005 — 07/2013)
•K26 (R 900 RT, R 1200 RT)   (11/2003 — 06/2014)
•K27 (R 1200 R)   (11/2005 — 07/2014)
•K28 (R 1200 ST)   (05/2003 — 11/2007)
•K40 (K 1200 S, K 1300 S)   (04/2003 — 09/2015)
•K43 (K 1200 R, Sport, K 1300 R)   (03/2004 — 07/2015)
•K44 (K 1200 GT, K 1300 GT)   (11/2004 — 10/2010)



34519444398
Pressure modulator - people are calling it ABS Gen 4 - later bikes replace a plastic rivet that sends undue vibrations - USA recall to retrofit the plastic rivet. ROW keep the failure
2021-06-14 SIB 34 03 20 USA SERVICE ACTION: ABS Modulator Mounting Bolt

From: 01/01/2019 To: - Price:
Supersedes:
34519898518 (08/01/2018 — 04/11/2019), Exchangeable retrospectively
34518566956 (07/01/2016 — 07/26/2018), Exchangeable retrospectively
34518561705 (08/01/2015 — 09/24/2018), Exchangeable retrospectively
34518554180 (04/21/2014 — 12/18/2015), Exchangeable retrospectively
34518549461 (08/01/2013 — 05/21/2014), Exchangeable retrospectively
34518534990 (09/01/2012 — 08/01/2014)
Part 34519444398 was found on the following vehicles:
•K50 (R 1200 GS, R 1250 GS)   (10/2011 — 02/2020)
•K51 (R 1200 GS Adv., R 1250 GS Adv.)   (09/2012 — 02/2020)
•K52 (R 1200 RT, R 1250 RT)   (01/2013 — 12/2019)
•K53 (R 1200 R, R 1250 R)   (11/2013 — 12/2019)
•K54 (R 1200 RS, R 1250 RS)   (06/2014 — 12/2019)
•K46 (S 1000 RR)   (10/2013 — 11/2018)
•K47 (S 1000 R)   (02/2013 — 02/2020)
•K49 (S 1000 XR)   (05/2014 — 11/2019)
•K48 (K 1600 GT, K 1600 GTL)   (01/2010 — 12/2019)
•K61 (K 1600 Bagger)   (01/2017 — 12/2019)