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Testing System (Motor On Car)

  1. If wiper is inoperative or intermittent, check for an open lead wire from motor terminal "1" to wiper switch. Check for a defective switch or poor switch ground.
  2. If wiper will not shut off (blades make full stroke), check for a grounded lead wire from wiper terminal "1" to wiper switch. Check for corroded wiper terminals or defective wiper switch.
  3. If wiper will not shut off (blades move up and down about 15° from park), check for an open lead wire from wiper terminal "3" to wiper switch. Check for a defective switch or poor ground.
  4. If wiper operates in high speed only, check for open lead wire from wiper terminal "3" to switch, or defective switch.
  5. If wiper operates in low speed only, check for a grounded lead from wiper terminal "3" to switch or defective wiper switch.
    NOTE: Cadillac only, if wiper operates in high speed with switch in "MED" position, check for open medium speed resistor.
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