With Non-Intermittent Wipers

Wiper motor may be operated independently of wiper switch to aid in locating defective components. The motor must be grounded for proper operation and during all tests.
1. To diagnose low speed operational problems, proceed as follows:
a. Connect a 12 volt test lamp to terminal B with ignition switch On.
b. If test lamp lights, but wiper motor does not operate, connect jumper wire between ground strap on motor and suitable body ground.
c. If motor still fails to operate, disconnect electrical connector from switch and connect jumper wire between switch terminals 2 and B to initiate low speed operation of motor.
d. If motor does not operate at low speed, there is an open in green wire, a defective internal motor connection or a stuck low speed brush.
2. To diagnose high speed operational problems, proceed as follows:
a. Connect jumper wire between terminals 3 and B to obtain high speed operation.
b. If motor does not operate at high speed, there is an open in red wire, a defective internal motor connection or a stuck high speed brush.
3. To diagnose park operation, proceed as follows:
a. Connect jumper wire between terminals 1 and B with wiper blades in any position other than parked. This should cause blades to run in low speed and stop in the park position.
b. If motor does not run with jumper wire connected, there is an open in black wire, a defective internal motor connection, a misaligned or damaged set of contact points or a defective connection through park point set to low speed brush.
c. If wiper motor runs but does not park, the drive gear cam is not properly breaking the contact points.
4. If wiper motor operates intermittently, a defective solder joint, wiring connection, body ground or worn brush may be at fault.