General Category > ABS related issues

No response from controller r1200cl 2004

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mayojuaf:
ok, tested in AC , (no DC) front rear and extra.
got this results, see pictures
The rear was turning slower as I had to deal with Osc, turning and picture  :)
I guess the sensor are working fine...?

anybody :) ?

WayneC:
Well done, you have managed to learn to use the DSO and yes it certainly does look like that sensor is working fine

To avoid the struggle to spin wheel juggle DSO and take a pic, you can save the wave form and bring it up on a PC to see it later

mayojuaf:
So according to the ones who know what they are talking about
6 things to cause ABS failure. It comes from the gs forum but is applicable to 2004 CL

1- Lever or pedal failing to travel fully back to the correct position. This is usually caused by the hand guard preventing the front brake lever from fully extending or a pebble or twig preventing the brake pedal from returning to its up most position. An easy way to tell that this is your problem is if your brake light is always be on. Notice, however, that it is possible to pull the lever sufficient for the ABS system to detect it, but not enough for the light to come on. This can be a confusing situation.

2- Sensors. If either of your brake sensors fail the brake light will stay on. Severed wires, dirty sensors or melted sensors can cause this failure. If your speedo works then your rear sensor is definitely OK. Make sure your front sensor is clean and wire is not severed.

3- Fluid levels. Tip overs can cause fluid to leak out of the ABS pump under the gas tank. Pull off the gas tank and top off each of the circuits. This will fix a fluid level related failure.

4 - Microswitch problems. There is a little tiny switch under the front brake lever and next to the rear brake pedal. You should hear an audible click when you activate either. This switch can fail although it is rare. If your problem is not 1,2 or 3 then this is probably your problem. If the switch is bad your brake light will not activate from the bad switch.

5- Low battery voltage. This is a the common cause of ABS failure on the 11xx versions of ABS. Usually the ABS will start working normally when the alternator gets the charge back up to normal. The ABS versions on the R1200GS are not as senstive to low voltage issues and voltage related failures are very rare.

6- Bad pump unit. Very rare. In fact I have not heard of one failing on the R1200GS yet. There have been a few replaced but these were diagnoses errors and real problem was one of the four items above.

I tested all of the above but the dreaded IABS Servo. that is the one that costs $2,000 and that they say can be converted to non ABS . Could not find anyone doing it in a 2004 R1200CL

so I won the battle on learning how to test switches and sensors, but lost the war of fixing my IABS issue.

WayneC:
Well you won the battle re the sensors and you are now moving to do battle with the IABS rather than losing the war  ;D

The fact that the IABS does not respond to diagnostics tends to indicate the electronics board in the IABS may be faulty which is not in the list of possibles

mayojuaf:
Thanks Wayne, any thought on how i can trouble shoot that to see if it reparable?

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