Join Date: Aug 2005
Location: Gilbert, AZ, USA
Re: Alternating ABS Lights
A couple months ago one of our more ingenious members finally figured out a way to reset the ABS flashing lights without taking it to the dealer. I copied the instructions from the post and have pasted them below for your use.
For 99/2000 model LTs.
It is not for models with integral ABS.
It has been suggested that the only way to clear ABS2 faults is by placing it on the diagnostic computer at a dealers shop. It can be done at home relatively simply.
You can clear the memory of faults and returns the ABS warning lights to normal on startup. If however you have failed to cure the cause of the fault, e.g. bad wheel sensor, the warning lights will return to their warning state once the bike has gone through it's self test process.
Firstly you can do some investigation of your own fault codes. Under the front seat and clipped to the frame there is a diagnostic connector. It is cylindrical in shape and has a removable push-and-turn gray cap.
Remove the cap and locate the pin 2, connected to a brown/blue wire. Connect an analogue meter between pin 2 and earth. Turn on the ignition. The meter will initially settle at around 10V. It's what happens next that is of interest. The needle will fall to a number of lower voltages in a series of pulses. Count the number of needle drops. This number is your fault code.
The following codes have appeared on other forums.
1.Front pressure modulator.
2. Rear pressure modulator.
3. Front wheel speed sensor.
4. Rear wheel speed sensor.
5. Battery voltage too low.
6. ABS relay.
7. ABS control unit.
8. Sensor gap front or rear or other outside influence.
16. Failed plunger test.
Ok. This may help you cure the actual fault, which is causing the alternating (wigwag) warning lights.
TO CARRY OUT A RESET
You need to get to pin 21 on the ABS controller. The connector is plugged into the ABS unit, which can be seen next to the battery holder towards the left hand side under the seat. Remove the battery to create some space.
RELEASE THE CONNECTOR
As you look down from above you can see a protruding rectangular steel clip at the bottom of the connector. You need to push this down while you pry out the connector from the bottom. However, the connector continues to be held in at the top of the unit. The connector itself has a plastic lip, which hooks under the top of the ABS unit. You will see a small screw in the top of the connector. Do not remove this, it will not help it has nothing to do with release. Use half a junior hacksaw blade to saw the piece of plastic from the connector. This allowed it to come free.
Remove the ABS controller wiring connector more easily by removing the positive cable post junction located behind ABS connector. This allowed enough room to release the top lip. Bosch fuel injector connectors off a 2002 Kia Sportage just happened to have same wiring connectors as the BMW ADS controller (small world!!) just run new wire to #21 terminal just like factory and leave for future reset.
Dismantle the connector to reveal the wire locations. Roll back the rubber protector tube where the wires enter the connector. This reveals two screws. There is another screw at the top of the connector. Remove all three screws and then pull the connector block from itís housing so you can see where the wires enter the terminal holes.
The inner connector has its terminals numbered along the sides. Terminal 21 is vacant. I stripped a thin wire and threaded it through the hole and then bent a small amount over to hold it in place being careful not to interfere with other terminals. I then carefully replaced the connector onto the ABS unit and replaced the battery.
Ground pin 2 of the diagnostic connector and kept it grounded. Switched on the ignition. Both ABS lights will be flashing alternately. Ground the wire from pin 21 and make a count of the number of seconds for the fault you have. As soon as you ground this wire one ABS light will stay on and one will turn off. At the end of the count remove the pin 21 wire from ground. Both ABS lights will now stay on together. Switch off the ignition and removed the diagnostic ground wire. Switch the ignition back on, both ABS lights should be flashing simultaneously.
Leave the pin 21 wire in place so it can be reset in the future at will.
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