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How can you diagnose a wiper motor problem or a wiper switch problem in a 1993 jeep wrangler yj?
Wiki User
∙ 14y ago
You have forgotten two other possibilities. The relay and the fuse. Start by checking the fuse. If it's bad replace it. If good then find the positive side of the motor and jump it directly to the positive side of the battery. If the motor runs then you know the problem is the switch or relay. If it doesn't then the motor is At Fault. To check the relay remove it from the panel. Most yj's had a relay panel box under the hood that housed the horn, wiper, fuel, headlight, and other relays. The wiper relay should be marked. Look under the relay for its number and circuit diagram. Compare it to the other relays. Most times you will find the headlight relay or fuel relay is the same. Try one in the wiper socket. If it works then replace the relay. If it doesn't then all that is left is the switch. If the switch is part of the steering column then checking it will involve removing the steering wheel. Best to let a Jeep Tech. do this especially if there is an air bag involved. Special tools needed. However if the switch is assessable then simply place a jump wire across the terminals to test. Good Luck and let me know how you make out.
M.
Last minute though !
Don't forget to check any ground wires for the motor.
Wiki User
∙ 14y ago
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