I’ve had my 2003 LeSabre for a year and a half. I’ve put 5 wiper motors on it. Three remanufactured. Two new. The reman’s lasted 3 to 4 months. One new one quit after a week. I put a new one on this week. Two days later they were coming on by themselves. Now their shuddering on intermittent. Do I get bad motors or is there another reason?
In my 1978 Oldsmobile, the wiper switch completed the path to the ground. As long as the ignition switch was on, the motor was always receiving power from the positive side of the electrical system. There was a resistor in the circuit for the lower speed, so the circuit was completed through the resistor to ground. In the high speed position, the circuit was completed directly to ground.
I don’t know the setup for a 2003 Buick, but it could be the case that the switch is allowing a little power to flow to ground but not enough to allow the wipers to move. This would cause current to flow through the motor windings and might be enough to burn them out over time. This might be the reason you keep going through wiper motors.
I’m assuming the new wiper motors came with new pulse boards?
If so, then the problem is between the wiper motor switch and the pulse board.
what you can do is measure the voltage at the plug to the motor on high medium and slow see if the voltage changes as you switch the wiper control on the steering wheel.
I find it hard to believe that 5 motors actually failed. Six counting the original.
Problem in the switch or a binding problem with the wiper arms or pivots would be my guess.
Are you using those double blade wipers ?
They make the motor work twice as hard and can burn motors up quickly