Motor Runs Slowly on Any Speed Setting

Whenever a wiper motor malfunction occurs, first ensure wiper motor wire harness is properly connected before starting with normal diagnosis and repair procedures.

1. Disconnect wiring harness connector at motor.
2. Remove wiper arms and blades.
3. Connect an ohmmeter between battery positive terminal and terminal 3 on motor.
4. If motor runs and average ammeter reading is more than 6 amps, proceed to motor linkage test step.
5. If motor runs and average ammeter reading is less than 6 amps, proceed to wire harness test step.
6. Check wiper linkage or pivots for binding. Disconnect drive link from motor.
7. If motor now runs and draws less than 3 amps, repair linkage system.
8. If motor continues to draw more than 3 amps, replace motor assembly.
9. Check motor wiring harness for shorting between high and low speed wires as follows:
a. Connect a voltmeter or test lamp to motor ground strap.
b. Set wiper switch on Low position.
c. Connect other lead to terminal 4 of wiring harness.
d. If voltage is present, there is a short in the wiring or the wiper switch. If no voltage is present, proceed to next step.
e. Set switch to High position.
f. Move voltmeter lead from terminal 4 to terminal 3.
g. If voltage is present, there is a short in the wiring or wiper switch.