No amount of water will
make the system run fast
This model of Rain Tracker does not automatically run the wipers at high speed.
Responds to water, but
Fast speed is slower than
it should be
There is probably some wiring error that is shorting the wiper motor slow and fast windings
together. For example, if the power diode (YEL & WHT) from Rain Tracker not wired in place.
Be sure to correct this, as it wears the wiper motor out.
Sensor wipes for no
reason
False wipes should be rare.
Sometimes the Rain Tracker will see the first droplets of water before the driver notices.
On very hot, humid days, water can drip down from the air conditioning units of the vehicles
ahead. This can cause enough tiny drops to trigger the Rain Tracker. Also, there can simply be
tiny droplets of water in the air in extreme humidity—the Rain Tracker detects water droplets as
small as about two one-hundredths of an inch. Simply turn the Rain Tracker off under such
conditions.
Wipers wiper when I
drive over bumps
Check to be sure that the sensor is securely snapped into the Rain Tracker coupler.
This can happen if the sensor cable has a long way to go to reach the headliner, and is not
secured. Solution: secure the sensor cable to the mirror mount base with a black cable tie.
Wipers wipe when I tap
the sensor
Stop tapping the sensor. Properly installed, the sensor is immune to normal vehicle vibration.
Late First Wipe
As with all rain sensors (including those sold on new cars), there will be times when enough
water has hit the windshield that you would like the wiper to wipe, but none has yet hit the
sensor. These cases should be infrequent enough that they are easily ignored. The Rain Tracker
is better in this respect than most rain sensors in the new-car market.
Rain Tracker RT-40A Troubleshooting Procedure : Motor Switching Applications
Page 4 of 4
Last Revised: 08/01/08
