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Driver Window Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the S79D window switch-driver.
  2. After 10 minutes, 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 the scan tool Driver Window Main Control Down Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, replace the M74D window motor-driver.
  4. Connect a 3 A fused jumper wire between the signal circuit terminal 7 and ground. Verify that the scan tool Driver Window Main Control Down Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74D window motor-driver.
  5. Verify that the scan tool Driver Window Main Control Up Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 8 for a short to ground. If the circuit tests normal, replace the M74D window motor-driver.
  6. Connect a 3 A fused jumper wire between the signal circuit terminal 8 and ground. Verify that the scan tool Driver Window Main Control Up Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74D window motor-driver.
  7. Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the M74 driver window motor.
  8. Connect a 3 A fused jumper wire between the signal circuit terminal 6 and ground, verify the scan tool Driver Window Main Control Express Switch parameter is Active.
    • If not the specified value, test the signal circuit terminal for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74 driver window motor.
  9. If all circuits test normal, replace the S79D window switch-driver.
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