If the wipers on the Lexus RX300, RX330, and RX350 are moving too slowly, start by checking that your car battery works well and stays charged. When the battery works fine, take out the wiper motor, move the wiper arms by hand, find and fix any linked locking trouble or wheel rotation parts, and put the motor back. To fix slow wiper operation, check the battery first. Also, find and repair faulty ground connections before looking at the motor. Get a new motor if neither connection fix works. First, check the
Fuse in the driver's side interior fuse panel. Then, connect a jumper wire between the ground terminal of the wiper motor and ground. Make sure the motor turns on during this test. Checkground connection first if wipers work; test motor voltage against ground if wipers stay stopped, making sure to remove the cowl cover to expose motor wiring. When you see voltage at the connector, take the motor off your car and test it with jumper wires from the battery. To find out why the motor isn't working, first see if the armature is stuck inside; if not, install a new motor. To find the problem, start by checking voltage at the wiper control relays; if there is power there but not at the motor, take the switch to a tester. When the switch tests fine, the wiper control relays need checking. To see why the time delay isn't working, test the wire connection between the switching device and the wiper control unit. When turning off the wiper switch, see if you find voltage at the motor park feed wire with the ignition on. If no voltage shows up, there must be an open circuit between the panel and the wiper motor. Begin your replacement work by taking off the wiper arm nuts and recording how the wiper arms fit to their shafts. After that, you can take both wiper arms off. First, unplug the wiring from the wiper motor. Afterwards, unscrew both mounting bolts for the motor and link assembly, and pull the entire assembly away. Slowly remove connectors from the motor crank while holding a screwdriver between the pivot pin and link rod, then unscrew the nut and washer that keeps the motor's crank arm attached to the shaft, note where the crank arm connects to the shaft, and take the crank arm off. To complete the task, simply remove the three motor bolts and pull the motor out from its housing on the link assembly, with putting it back in place done in the opposite order of removal.