Question about 2002 Chevrolet TrailBlazer
Rear Wiper goes on intermittently with the switch set to ''off'' position. It goes on ...cycles once then locks down into off position, then starts up again while making a chattering noise. I have to turn it on to the ''1'' position while I drive otherwise it becomes rather irritating. Is this a switch, wiper motor, relay or some type of sensor problem? Is there a fuse that I can pull to render the Rear Wiper inoperative till I can get it fixed?
Macomb Twp, MI
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Posted on Jan 02, 2017
Well sure enough all I had to do was replace the circuit board...wish I had done this a couple months ago...it was so easy to do and will now be much easier to drive with being able to see clearly again....
Posted on Jan 08, 2009
SOURCE: windshield wipers wont shut off
The problem is in the wiper motor assembly. Did you ever notice that when you switch the wipers off they always go back to the home position? This is due to a switch that keeps the wiper motor operating until the wipers are parked. In many older GM vehicles this is accomplished with a leaf type switch which opens when the wipers are in the correct position. when the dash switch is turned on this switched is bypassed keeping them on-when the wipers are turned off the motor continues to operate until this connection is broken.
Inside the wiper motor housing there is a nylon gear that drives a cam that cycles the leaf switch-most likely the gear has become damaged so it no longer drives the leaf switch allowing the switch to remain closed. A cheap fix is to disassemble the motor unit and piece of tape between the contacts. Although the wiper will not park properly they once again can be controlled by the dashboard switch.
In later vehicles the wiper position is located with an electronic sensor with a small PB board - the repair of this gizmo is beyond the scope of most shade tree mecahnics - so the solution is to replace the entire wiper motor assembly - unfortuneatly.
Posted on Jan 16, 2009
The routine (resistor) that shuts off the wipers and parks them correctly is in the wiper motor, not the switch. I assume your switch is good since you make no complaints about its movement. One thing to check before replacing wiper motor is to loosen the wiper arms, and let the motor park itself in what you feel is the bottom of windshield position. Now align the wipers and retighten.
If these get positioned wrong after, say, a frozen morning, this will affect parking of wipers since motor "park" is no longer in synch with wiper arm "park."
Otherwise, if wiring and positioning are correct, I recommend replacing the wiper motor itself.
Posted on Jan 27, 2009
Check that you have connected the wiper motor correctly - ensure that you havent inadvertently got the polarity wrong!.
Leave the wiper arms off until you get the motor to run and park using the normal wiper on/off switch.
The motor 'park' control switching is normally an integral part of the motor drive gear and is not adjustable.
During your testing, affix a temporary indicator pointer to the end of a wiper arm drive shaft (use masking tape or similar) to prevent damage to motor or levers.
Posted on Jul 11, 2009
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