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Rear Window Malfunction

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate S79R window switch-rear.
  2. Test for less than 5 Ω between the ground circuit terminal 5 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 8 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 5-10V between the serial data circuit terminal 1 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. Ignition OFF, connect the harness connector at the S79R window switch-rear.
  6. Disconnect the harness connector at the appropriate M74R window motor-rear.
  7. Test for less than 5 Ω between the control circuit terminal A and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the S79R window switch-rear.
  8. Test for less than 5 Ω between the control circuit terminal B and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the S79R window switch-rear.
  9. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
  10. Ignition ON, command the rear window UP and DOWN using the S79R window switch-rear. The test lamp should briefly illuminate when commanding the UP and DOWN states.
    • If the test lamp does not illuminate during either of the commands, test both control circuits for a short to ground. If the circuits test normal, replace the S79R window switch-rear.
  11. If all circuits test normal, test or replace the M74R window motor-rear.
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