IABS light flashing, warning ligh on, no speedometer r1200cl 2004 - BMW Luxury Touring Community
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post #1 of 2 Old Oct 28th, 2016, 5:23 pm Thread Starter
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IABS light flashing, warning ligh on, no speedometer r1200cl 2004

I am attaching link to a very lengthy description of the problem and the troubleshooting

The executive summary is
Brake light is always on (both filaments)
Speedometer does not work
so IABS (servo unit in 2004) light flashes fast and warning light is on
Test cycle does not complete so no servo brakes

Troubleshoot steps
Tested both break switches and work fine. Front shows 3.85 V and goes to 0 when pressed. Rear same voltage and goes to 0. When bike is with no ignition key, both switches show 1.4 V. (is this ok)

Blue ABS relay under tank is ok, tested and clicked and tested two other connectors of relay and they have Voltage

I tested the speed sensors by pinching the cables before they get to the wheel. I understand that will only tell me volts being sent to the sensor, but not if the electromagnetic coil is working correctly. Nevertheless...
In the back sensor I got 0V when off and 9.95V when switch on. On the front was weird. With switch off I got 2.3v....and with switch on got the 9 something volts. Seems is not ok. Problem is front sensor plug is under cockpit (so very difficult to reach and replace)

The complete story with pictures etc is at

If want to read it all, be sure you also go through archives as the thread is new but has lots of inputs and pictures.
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post #2 of 2 Old Nov 15th, 2016, 6:49 pm
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Join Date: May 2004
Location: Hazel Green, AL, USA
Posts: 13,157
Re: IABS light flashing, warning ligh on, no speedometer r1200cl 2004

Don't see any links but the volts must be referenced to battery (-) not the metal parts of the bike. BMW only uses Brown wires for ground return, not the frame.

A more definitive diagnosis is only possible with a GS-911 unit or the dealers computer.

I thought the user name looked familiar, I answered you earlier post in the technical files area. Still think you have a fried ABS brain if the GS-911 unit will not read it.

2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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