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they all guess, do you want me to guess, too? surely not.
or test?. we can use a voltmeter to find this.
what we do is look at the schematics at alldata.com
and its all clear. a simple road map;
Sticking on possibles.
the fuses are underhood. fuse 11 and 31
bad motor , internal keep alive cam switch stuck on,
will cause continuous wiper.s
so will motor colored wires green or blue hot full time
will keep motor going full time (any voltmeter, easy check)
12vdc is bad, 0v good (wipers off)
next and last is that wiper relay in hood fuse box, shorted. (pull it out see if they shut off?)
if the relay is good then its input is wrong. the control block.
the combo switch wipers on , sends a CAN buss digital commands to the MICU control block, this i turn powers up the wiper relay.
the MICU has a diagnostic port,and can be tested at the dealer
if the relay coil pins are hot all the time, then the MICU /combo side is failing, if not, the problem is the relay ,if its output is hot all the time.
how is that?
Hi, had the same problem today. Solution: Start engine, blower on max, air direction to cabin, press rear wiper and rear wash buttons simulanteously for 5 seconds (all lights now on steady). Calibration test starts and lights flsh alternately. After first test, AC and recurculation lights flash for the cool down test. If all test pass then rear wiper light blinks slowly (press to exit self test). If AC and recurculation test fails then just 2 lights stay on. To repeat this part of the test press just AC and rear wash simulanteously ( may take several attempts and usually best when engine is cold). Again exit by pressing the rear wiper button once it is the only one flashing (slow blink).
This does work but it took me 15 minutes to finally switch them off!!!
You have two problems. The first is the wipers turn off and stay in the upright position and do not close. The motor is fine. There is a steal 'close' tab that has been bent out of position. You just need to push the steal tab back into position. You can use a chisel or screwdriver to pound it back into the 90 degree position.
The windsheild washer motor probably needs to be replaced