Check the wiring where the rubber grommet is at top of rear hatch. It's a bending point, can cause these problems.
SOURCE: 2003 trailblazer rear wiper not spraying
I had this problem too, you have to take the back hatch panel off and reconect the hoses. the hoses are about as big as a drinking straw. it's not hard, but is time consuming.
SOURCE: 2003 Murano front wipers just stopped!!
sounds like thats it, you can check it for power,to make sure but it does sound like the motor.
SOURCE: 2003 cavalier only one wiper works
If one works the motor is ok. The issue is morre than likley the linkage under the crowel below the windsheild. it has com apart or the wiper transmission is bad. Try accessing that arrea to get a look. you will probably see the control arm just lying on the bottom, possably along with the nut that fell off the back of the transmission.
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