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Driver Power Window Switch Malfunction

WARNING: This page is about a different car, the 2011 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the S79D window switch-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 and open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that the scan tool Driver Window Main Control Down Switch parameter is Inactive.
    • If not the specified value, test the control circuit terminal 3 for a short to ground. If the circuit tests normal, test or replace the M74D window motor-driver.
  5. Connect a 5 A fused jumper wire between the control circuit terminal 3 and ground, verify that the scan tool Driver Window Main Control Down Switch parameter is Active.
    • If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the M74D window motor-driver.
  6. Verify that the scan tool Driver Window Main Control Up Switch parameter is Inactive.
    • If not the specified value, test the control circuit terminal 6 for a short to ground. If the circuit tests normal, test or replace the M74D window motor-driver.
  7. Connect a 5 A fused jumper wire between the control circuit terminal 6 and ground, verify that the scan tool Driver Window Main Control Up Switch parameter is Active.
    • If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the M74D window motor-driver.
  8. Verify that the scan tool Driver Window Main Control Express Switch parameter is Inactive.
    • If not the specified value, test the control circuit terminal 2 for a short to ground. If the circuit tests normal, test or replace the M74D window motor-driver.
  9. Connect a 5 A fused jumper wire between the control circuit terminal 2 and ground, verify that the scan tool Driver Window Main Control Express Switch parameter is Active.
    • If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the M74D window motor-driver.
  10. If all circuits test normal, test or replace the S79D window switch-driver.
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