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lostrider
lostrider, Ford Technician
Category: Ford
Satisfied Customers: 3075
Experience:  ASE Master Technician, Ford Senior Master Technician,Diesel certified, ASE Master, 22 yrs FORD exp.
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1990 Ford: xlt..Lariat..Wiper..high and not on intermittent

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1990 Ford xlt Lariat. Wiper problem. They only work on high and not on intermittent or standard speed. I have replaced both the wiper motor and the switch but the problem remains.
HiCustomerthis is lostrider, there is a wiper governor that is inline between the switch and the motor, that is probly where the problem is, here is the testing procedure and the wiring diagram and the governor location, hope this helps.graphicgraphic
Interval Wipers
Notes

QUICK CHECK

If wipers operate in high speed only and hesitate when going through Park position, connect jumper wire from wiper switch case to ground. If wipers now operate in low speed, repair switch ground. If wipers do not work in low speed with switch case grounded, replace governor.

HIGH SPEED TEST

  1. Turn ignition switch on and turn wiper switch to high position.
  2. Check for voltage at circuit 56 pin (blue/orange wire).
  3. If there is voltage but motor does not run, ground motor case to body. If motor runs, repair motor ground, if motor does not run, replace motor.
  4. If there is voltage at circuit 63 pin (red wire), but not at 56, replace wiper switch.
  5. If there is no voltage at 63, remove wiper switch connector and check for voltage at circuit 297 pin (black/green wire). If there is voltage, replace wiper switch. If there is no voltage, trace circuit back to current source.

LOW SPEED TEST

  1. Turn ignition switch on and turn wiper switch to low position.
  2. Check for voltage at circuit 58 pin (white wire).
  3. If there is voltage but motor does not run, ground motor case to body. If motor runs, repair motor ground. If motor does not run, replace motor.
  4. If there is voltage at circuit 63 pin (red wire), but not at 58, ground control circuits 57A (black wire) and 28A (black/pink wire) at wiper switch connector.
  5. If there is voltage at 58 with control circuits grounded, replace wiper switch.
  6. If there is no voltage at 58 with control circuits grounded, replace governor.
  7. If there is no voltage at 63, remove wiper switch connector and check for voltage at circuit 297 pin (black/green wire). If there is voltage, replace wiper switch. If there is no voltage, trace circuit back to current source. If governor relay is inoperative, wipers will operate in high speed and park only. Low and interval will not operate.

PARK OPERATION TEST

  1. Turn ignition switch on and turn wiper switch to off position.
  2. Check for voltage at circuit 58 pin (white wire).
  3. If there is voltage but wipers do not park, ground wiper motor case to body. If wipers park, repair ground. If motor does not run, replace motor.
  4. If there is voltage at circuits 63 (red wire) and 28 (black/pink wire) pins, but not at 58, replace governor.
  5. If there is voltage at 63 but not at 28 and wipers are parked, replace motor.
  6. If there is no voltage at 63, remove wiper switch connector and check for voltage at circuit 297 pin (black/green wire). If there is voltage, replace wiper switch. If there is no voltage, trace circuit back to current source.

 

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