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Driver Window Motor Malfunction

  1. Ignition OFF, disconnect the harness connector at the M74D window motor-driver.
  2. Test for less than 30 Ω between the ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Test for 5-10 V between the serial data circuit terminal 4 and ground.
    • If greater than the specified range, test the serial data circuit for a short to voltage.
    • If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance.
  5. If all circuits test normal, test or replace the M74D window motor-driver.
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